/* * Copyright 2022 The Hafnium Authors. * * Use of this source code is governed by a BSD-style * license that can be found in the LICENSE file or at * https://opensource.org/licenses/BSD-3-Clause. */ #include "hf/api.h" #include "hf/arch/cpu.h" #include "hf/arch/ffa.h" #include "hf/arch/memcpy_trapped.h" #include "hf/arch/mm.h" #include "hf/arch/other_world.h" #include "hf/arch/plat/ffa.h" #include "hf/arch/timer.h" #include "hf/arch/vm.h" #include "hf/check.h" #include "hf/dlog.h" #include "hf/ffa_internal.h" #include "hf/ffa_memory.h" #include "hf/ffa_v1_0.h" #include "hf/mm.h" #include "hf/plat/console.h" #include "hf/plat/interrupts.h" #include "hf/spinlock.h" #include "hf/static_assert.h" #include "hf/std.h" #include "hf/vm.h" #include "vmapi/hf/call.h" #include "vmapi/hf/ffa.h" #include "vmapi/hf/ffa_v1_0.h" static_assert(sizeof(struct ffa_partition_info_v1_0) == 8, "Partition information descriptor size doesn't match the one in " "the FF-A 1.0 EAC specification, Table 82."); static_assert(sizeof(struct ffa_partition_info) == 24, "Partition information descriptor size doesn't match the one in " "the FF-A 1.1 BETA0 EAC specification, Table 13.34."); static_assert((sizeof(struct ffa_partition_info) & 7) == 0, "Partition information descriptor must be a multiple of 8 bytes" " for ffa_partition_info_get_regs to work correctly. Information" " from this structure are returned in 8 byte registers and the" " count of 8 byte registers is returned by the ABI."); /* * To eliminate the risk of deadlocks, we define a partial order for the * acquisition of locks held concurrently by the same physical CPU. Our current * ordering requirements are as follows: * * vm::lock -> vcpu::lock -> mm_stage1_lock -> dlog sl * * Locks of the same kind require the lock of lowest address to be locked first, * see `sl_lock_both()`. */ static_assert(HF_MAILBOX_SIZE == PAGE_SIZE, "Currently, a page is mapped for the send and receive buffers so " "the maximum request is the size of a page."); static_assert(MM_PPOOL_ENTRY_SIZE >= HF_MAILBOX_SIZE, "The page pool entry size must be at least as big as the mailbox " "size, so that memory region descriptors can be copied from the " "mailbox for memory sharing."); /* * Maximum ffa_partition_info entries that can be returned by an invocation * of FFA_PARTITION_INFO_GET_REGS_64 is size in bytes, of available * registers/args in struct ffa_value divided by size of struct * ffa_partition_info. For this ABI, arg3-arg17 in ffa_value can be used, i.e. * 15 uint64_t fields. For FF-A v1.1, this value should be 5. */ #define MAX_INFO_REGS_ENTRIES_PER_CALL \ ((15 * sizeof(uint64_t)) / sizeof(struct ffa_partition_info)) static_assert(MAX_INFO_REGS_ENTRIES_PER_CALL == 5, "FF-A v1.1 supports no more than 5 entries" " per FFA_PARTITION_INFO_GET_REGS64 calls"); static struct mpool api_page_pool; /** * Initialises the API page pool by taking ownership of the contents of the * given page pool. */ void api_init(struct mpool *ppool) { mpool_init_from(&api_page_pool, ppool); } /** * Get target VM vCPU: * If VM is UP then return first vCPU. * If VM is MP then return vCPU whose index matches current CPU index. */ struct vcpu *api_ffa_get_vm_vcpu(struct vm *vm, struct vcpu *current) { ffa_vcpu_index_t current_cpu_index = cpu_index(current->cpu); struct vcpu *vcpu = NULL; CHECK((vm != NULL) && (current != NULL)); if (vm->vcpu_count == 1) { vcpu = vm_get_vcpu(vm, 0); } else if (current_cpu_index < vm->vcpu_count) { vcpu = vm_get_vcpu(vm, current_cpu_index); } return vcpu; } /** * Switches the physical CPU back to the corresponding vCPU of the VM whose ID * is given as argument of the function. * * Called to change the context between SPs for direct messaging (when Hafnium * is SPMC), and on the context of the remaining 'api_switch_to_*' functions. * * This function works for partitions that are: * - UP migratable. * - MP with pinned Execution Contexts. */ struct vcpu *api_switch_to_vm(struct vcpu_locked current_locked, struct ffa_value to_ret, enum vcpu_state vcpu_state, ffa_id_t to_id) { struct vm *to_vm = vm_find(to_id); struct vcpu *next = api_ffa_get_vm_vcpu(to_vm, current_locked.vcpu); CHECK(next != NULL); /* Set the return value for the target VM. */ arch_regs_set_retval(&next->regs, to_ret); /* Set the current vCPU state. */ current_locked.vcpu->state = vcpu_state; return next; } /** * Switches the physical CPU back to the corresponding vCPU of the primary VM. * * This triggers the scheduling logic to run. Run in the context of secondary VM * to cause FFA_RUN to return and the primary VM to regain control of the CPU. */ struct vcpu *api_switch_to_primary(struct vcpu_locked current_locked, struct ffa_value primary_ret, enum vcpu_state secondary_state) { /* * If the secondary is blocked but has a timer running, sleep until the * timer fires rather than indefinitely. */ switch (primary_ret.func) { case HF_FFA_RUN_WAIT_FOR_INTERRUPT: case FFA_MSG_WAIT_32: { if (arch_timer_enabled_current()) { uint64_t remaining_ns = arch_timer_remaining_ns_current(); if (remaining_ns == 0) { /* * Timer is pending, so the current vCPU should * be run again right away. */ primary_ret = (struct ffa_value){ .func = FFA_INTERRUPT_32}; } else { primary_ret.arg2 = remaining_ns; } } else { primary_ret.arg2 = FFA_SLEEP_INDEFINITE; } break; } default: /* Do nothing. */ break; } return api_switch_to_vm(current_locked, primary_ret, secondary_state, HF_PRIMARY_VM_ID); } /** * Choose next vCPU to run to be the counterpart vCPU in the other * world (run the normal world if currently running in the secure * world). Set current vCPU state to the given vcpu_state parameter. * Set FF-A return values to the target vCPU in the other world. * * Called in context of a direct message response from a secure * partition to a VM. */ struct vcpu *api_switch_to_other_world(struct vcpu_locked current_locked, struct ffa_value other_world_ret, enum vcpu_state vcpu_state) { return api_switch_to_vm(current_locked, other_world_ret, vcpu_state, HF_OTHER_WORLD_ID); } /** * Returns true if the given vCPU is executing in context of an * FFA_MSG_SEND_DIRECT_REQ invocation. */ bool is_ffa_direct_msg_request_ongoing(struct vcpu_locked locked) { return locked.vcpu->direct_request_origin.vm_id != HF_INVALID_VM_ID; } /** * Returns true if the VM owning the given vCPU is supporting managed exit and * the vCPU is currently processing a managed exit. */ static bool api_ffa_is_managed_exit_ongoing(struct vcpu_locked vcpu_locked) { return (plat_ffa_vm_managed_exit_supported(vcpu_locked.vcpu->vm) && vcpu_locked.vcpu->processing_managed_exit); } /** * Returns to the primary VM and signals that the vCPU still has work to do so. */ struct vcpu *api_preempt(struct vcpu *current) { struct vcpu_locked current_locked; struct vcpu *next; struct ffa_value ret = { .func = FFA_INTERRUPT_32, .arg1 = ffa_vm_vcpu(current->vm->id, vcpu_index(current)), }; current_locked = vcpu_lock(current); next = api_switch_to_primary(current_locked, ret, VCPU_STATE_PREEMPTED); vcpu_unlock(¤t_locked); return next; } /** * Puts the current vCPU in wait for interrupt mode, and returns to the primary * VM. */ struct vcpu *api_wait_for_interrupt(struct vcpu *current) { struct vcpu_locked current_locked; struct vcpu *next; struct ffa_value ret = { .func = HF_FFA_RUN_WAIT_FOR_INTERRUPT, .arg1 = ffa_vm_vcpu(current->vm->id, vcpu_index(current)), }; current_locked = vcpu_lock(current); next = api_switch_to_primary(current_locked, ret, VCPU_STATE_BLOCKED_INTERRUPT); vcpu_unlock(¤t_locked); return next; } /** * Puts the current vCPU in off mode, and returns to the primary VM. */ struct vcpu *api_vcpu_off(struct vcpu *current) { struct vcpu_locked current_locked; struct vcpu *next; struct ffa_value ret = { .func = HF_FFA_RUN_WAIT_FOR_INTERRUPT, .arg1 = ffa_vm_vcpu(current->vm->id, vcpu_index(current)), }; current_locked = vcpu_lock(current); /* * Disable the timer, so the scheduler doesn't get told to call back * based on it. */ arch_timer_disable_current(); next = api_switch_to_primary(current_locked, ret, VCPU_STATE_OFF); vcpu_unlock(¤t_locked); return next; } /** * The current vCPU is blocked on some resource and needs to relinquish * control back to the execution context of the endpoint that originally * allocated cycles to it. */ struct ffa_value api_yield(struct vcpu *current, struct vcpu **next, struct ffa_value *args) { struct ffa_value ret = (struct ffa_value){.func = FFA_SUCCESS_32}; struct vcpu_locked current_locked; bool transition_allowed; enum vcpu_state next_state = VCPU_STATE_RUNNING; uint32_t timeout_low = 0; uint32_t timeout_high = 0; struct vcpu_locked next_locked = (struct vcpu_locked){ .vcpu = NULL, }; if (args != NULL) { if (args->arg4 != 0U || args->arg5 != 0U || args->arg6 != 0U || args->arg7 != 0U) { dlog_error( "Parameters passed through registers X4-X7 " "must be zero\n"); return ffa_error(FFA_INVALID_PARAMETERS); } timeout_low = (uint32_t)args->arg2 & 0xFFFFFFFF; timeout_high = (uint32_t)args->arg3 & 0xFFFFFFFF; } if (current->vm->id == HF_PRIMARY_VM_ID) { /* NOOP on the primary as it makes the scheduling decisions. */ return ret; } current_locked = vcpu_lock(current); transition_allowed = plat_ffa_check_runtime_state_transition( current_locked, current->vm->id, HF_INVALID_VM_ID, next_locked, FFA_YIELD_32, &next_state); if (!transition_allowed) { ret = ffa_error(FFA_DENIED); goto out; } /* * The current vCPU is expected to move to BLOCKED state. However, * under certain circumstances, it is allowed for the current vCPU * to be resumed immediately without ever moving to BLOCKED state. One * such scenario occurs when an SP's execution context attempts to * yield cycles while handling secure interrupt. Refer to the comments * in the SPMC variant of the plat_ffa_yield_prepare function. */ assert(!vm_id_is_current_world(current->vm->id) || next_state == VCPU_STATE_BLOCKED); ret = plat_ffa_yield_prepare(current_locked, next, timeout_low, timeout_high); out: vcpu_unlock(¤t_locked); return ret; } /** * Switches to the primary so that it can switch to the target, or kick it if it * is already running on a different physical CPU. */ static struct vcpu *api_wake_up_locked(struct vcpu_locked current_locked, struct vcpu *target_vcpu) { struct ffa_value ret = { .func = FFA_INTERRUPT_32, .arg1 = ffa_vm_vcpu(target_vcpu->vm->id, vcpu_index(target_vcpu)), }; return api_switch_to_primary(current_locked, ret, VCPU_STATE_BLOCKED); } struct vcpu *api_wake_up(struct vcpu *current, struct vcpu *target_vcpu) { struct vcpu_locked current_locked; struct vcpu *next; current_locked = vcpu_lock(current); next = api_wake_up_locked(current_locked, target_vcpu); vcpu_unlock(¤t_locked); return next; } /** * Aborts the vCPU and triggers its VM to abort fully. */ struct vcpu *api_abort(struct vcpu *current) { struct ffa_value ret = ffa_error(FFA_ABORTED); struct vcpu_locked current_locked; struct vcpu *next; struct vm_locked vm_locked; dlog_notice("Aborting VM %#x vCPU %u\n", current->vm->id, vcpu_index(current)); if (current->vm->id == HF_PRIMARY_VM_ID) { /* TODO: what to do when the primary aborts? */ for (;;) { /* Do nothing. */ } } atomic_store_explicit(¤t->vm->aborting, true, memory_order_relaxed); vm_locked = vm_lock(current->vm); plat_ffa_free_vm_resources(vm_locked); vm_unlock(&vm_locked); current_locked = vcpu_lock(current); next = api_switch_to_primary(current_locked, ret, VCPU_STATE_ABORTED); vcpu_unlock(¤t_locked); return next; } /* * Format the partition info descriptors according to the version supported * by the endpoint and return the size of the array created. */ static struct ffa_value send_versioned_partition_info_descriptors( struct vm_locked vm_locked, struct ffa_partition_info *partitions, uint32_t vm_count) { struct vm *vm = vm_locked.vm; uint32_t version = vm->ffa_version; uint32_t partition_info_size; uint32_t buffer_size; struct ffa_value ret; /* Acquire receiver's RX buffer. */ if (!plat_ffa_acquire_receiver_rx(vm_locked, &ret)) { dlog_verbose("Failed to acquire RX buffer for VM %x\n", vm->id); return ret; } if (vm_is_mailbox_busy(vm_locked)) { /* * Can't retrieve memory information if the mailbox is not * available. */ dlog_verbose("RX buffer not ready.\n"); return ffa_error(FFA_BUSY); } if (version == MAKE_FFA_VERSION(1, 0)) { struct ffa_partition_info_v1_0 *recv_mailbox = vm->mailbox.recv; partition_info_size = sizeof(struct ffa_partition_info_v1_0); buffer_size = partition_info_size * vm_count; if (buffer_size > HF_MAILBOX_SIZE) { dlog_error( "Partition information does not fit in the " "VM's RX buffer.\n"); return ffa_error(FFA_NO_MEMORY); } for (uint32_t i = 0; i < vm_count; i++) { /* * Populate the VM's RX buffer with the partition * information. Clear properties bits that must be zero * according to DEN0077A FF-A v1.0 REL Table 8.25. */ recv_mailbox[i].vm_id = partitions[i].vm_id; recv_mailbox[i].vcpu_count = partitions[i].vcpu_count; recv_mailbox[i].properties = partitions[i].properties & ~FFA_PARTITION_v1_0_RES_MASK; } } else { partition_info_size = sizeof(struct ffa_partition_info); buffer_size = partition_info_size * vm_count; if (buffer_size > HF_MAILBOX_SIZE) { dlog_error( "Partition information does not fit in the " "VM's RX " "buffer.\n"); return ffa_error(FFA_NO_MEMORY); } /* * Populate the VM's RX buffer with the partition information. */ if (!memcpy_trapped(vm->mailbox.recv, HF_MAILBOX_SIZE, partitions, buffer_size)) { dlog_error( "%s: Failed to copy ffa_partition_info " "descriptor\n", __func__); return ffa_error(FFA_ABORTED); } } vm->mailbox.recv_size = buffer_size; /* Sender is Hypervisor in the normal world (TEE in secure world). */ vm->mailbox.recv_sender = HF_VM_ID_BASE; vm->mailbox.recv_func = FFA_PARTITION_INFO_GET_32; vm->mailbox.state = MAILBOX_STATE_FULL; /* * Return the count of partition information descriptors in w2 * and the size of the descriptors in w3. */ return (struct ffa_value){.func = FFA_SUCCESS_32, .arg2 = vm_count, .arg3 = partition_info_size}; } static void api_ffa_fill_partitions_info_array( struct ffa_partition_info *partitions, size_t partitions_len, const struct ffa_uuid *uuid, bool count_flag, ffa_id_t vm_id, ffa_vm_count_t *vm_count_out) { ffa_vm_count_t vm_count = 0; bool uuid_is_null = ffa_uuid_is_null(uuid); assert(vm_get_count() <= partitions_len); /* * Iterate through the VMs to find the ones with a matching * UUID. A Null UUID retrieves information for all VMs. */ for (ffa_vm_count_t index = 0; index < vm_get_count(); ++index) { struct vm *vm = vm_find_index(index); for (uint32_t i = 0; i < PARTITION_MAX_UUIDS; i++) { /* * Null UUID indicates reaching the end of a * partition's array of UUIDs. */ if (ffa_uuid_is_null(&vm->uuids[i])) { break; } if (uuid_is_null || ffa_uuid_equal(uuid, &vm->uuids[i])) { uint16_t array_index = vm_count; ++vm_count; if (count_flag) { continue; } partitions[array_index].vm_id = vm->id; partitions[array_index].vcpu_count = vm->vcpu_count; partitions[array_index].properties = plat_ffa_partition_properties(vm_id, vm); partitions[array_index].properties |= vm_are_notifications_enabled(vm) ? FFA_PARTITION_NOTIFICATION : 0; partitions[array_index].properties |= FFA_PARTITION_AARCH64_EXEC; if (uuid_is_null) { partitions[array_index].uuid = vm->uuids[i]; } } } } *vm_count_out = vm_count; } static inline void api_ffa_pack_vmid_count_props( uint64_t *xn, ffa_id_t vm_id, ffa_vcpu_count_t vcpu_count, ffa_partition_properties_t properties) { *xn = (uint64_t)vm_id; *xn |= (uint64_t)vcpu_count << 16; *xn |= (uint64_t)properties << 32; } static inline void api_ffa_pack_uuid(uint64_t *xn_1, uint64_t *xn_2, struct ffa_uuid *uuid) { *xn_1 = (uint64_t)uuid->uuid[0]; *xn_1 |= (uint64_t)uuid->uuid[1] << 32; *xn_2 = (uint64_t)uuid->uuid[2]; *xn_2 |= (uint64_t)uuid->uuid[3] << 32; } /** * This function forwards the FFA_PARTITION_INFO_GET_REGS ABI to the other world * when hafnium is the hypervisor to determine the secure partitions. When * hafnium is the SPMC, this function forwards the call to the SPMD to discover * SPMD logical partitions. The function returns true when partition information * is filled in the partitions array and false if there are errors. Note that * the SPMD and SPMC may return an FF-A error code of FFA_NOT_SUPPORTED when * there are no SPMD logical partitions or no secure partitions respectively, * and this is not considered a failure of the forwarded call. A caller is * expected to check the return value before consuming the information in the * partitions array passed in and ret_count. */ static bool api_ffa_partition_info_get_regs_forward( const struct ffa_uuid *uuid, const uint16_t tag, struct ffa_partition_info *partitions, uint16_t partitions_len, ffa_vm_count_t *ret_count) { (void)tag; struct ffa_value ret; uint16_t last_index = UINT16_MAX; uint16_t curr_index = 0; uint16_t start_index = 0; if (!plat_ffa_partition_info_get_regs_forward_allowed()) { return true; } while (start_index <= last_index) { ret = ffa_partition_info_get_regs(uuid, start_index, 0); if (ffa_func_id(ret) != FFA_SUCCESS_64) { /* * If there are no logical partitions, SPMD returns * NOT_SUPPORTED, that is not an error. If there are no * secure partitions the SPMC returns NOT_SUPPORTED. */ if ((ffa_func_id(ret) == FFA_ERROR_32) && (ffa_error_code(ret) == FFA_NOT_SUPPORTED)) { return true; } return false; } if (!api_ffa_fill_partition_info_from_regs( ret, start_index, partitions, partitions_len, ret_count)) { return false; } last_index = ffa_partition_info_regs_get_last_idx(ret); curr_index = ffa_partition_info_regs_get_curr_idx(ret); start_index = curr_index + 1; } return true; } bool api_ffa_fill_partition_info_from_regs( struct ffa_value ret, uint16_t start_index, struct ffa_partition_info *partitions, uint16_t partitions_len, ffa_vm_count_t *ret_count) { uint16_t vm_count = *ret_count; uint16_t curr_index = 0; uint8_t num_entries = 0; uint8_t idx = 0; /* List of pointers to args in return value. */ uint64_t *arg_ptrs[] = { &ret.arg3, &ret.arg4, &ret.arg5, &ret.arg6, &ret.arg7, &ret.extended_val.arg8, &ret.extended_val.arg9, &ret.extended_val.arg10, &ret.extended_val.arg11, &ret.extended_val.arg12, &ret.extended_val.arg13, &ret.extended_val.arg14, &ret.extended_val.arg15, &ret.extended_val.arg16, &ret.extended_val.arg17, }; if (vm_count > partitions_len) { return false; } /* * Tags are currently unused in the implementation. Expect it to be * zero since the implementation does not provide a tag when calling * the FFA_PARTITION_INFO_GET_REGS ABI. */ assert(ffa_partition_info_regs_get_tag(ret) == 0); /* * Hafnium expects the size of the returned descriptor to be equal to * the size of the structure in the FF-A 1.1 specification. When future * enhancements are made, this assert can be relaxed. */ assert(ffa_partition_info_regs_get_desc_size(ret) == sizeof(struct ffa_partition_info)); curr_index = ffa_partition_info_regs_get_curr_idx(ret); /* FF-A 1.2 ALP0, section 14.9.2 Usage rule 7. */ assert(start_index <= curr_index); num_entries = curr_index - start_index + 1; if (num_entries > (partitions_len - vm_count) || num_entries > MAX_INFO_REGS_ENTRIES_PER_CALL) { return false; } while (num_entries) { uint64_t info = *(arg_ptrs[(ptrdiff_t)(idx++)]); uint64_t uuid_lo = *(arg_ptrs[(ptrdiff_t)(idx++)]); uint64_t uuid_high = *(arg_ptrs[(ptrdiff_t)(idx++)]); partitions[vm_count].vm_id = info & 0xFFFF; partitions[vm_count].vcpu_count = (info >> 16) & 0xFFFF; partitions[vm_count].properties = (info >> 32); partitions[vm_count].uuid.uuid[0] = uuid_lo & 0xFFFFFFFF; partitions[vm_count].uuid.uuid[1] = (uuid_lo >> 32) & 0xFFFFFFFF; partitions[vm_count].uuid.uuid[2] = uuid_high & 0xFFFFFFFF; partitions[vm_count].uuid.uuid[3] = (uuid_high >> 32) & 0xFFFFFFFF; vm_count++; num_entries--; } *ret_count = vm_count; return true; } struct ffa_value api_ffa_partition_info_get_regs(struct vcpu *current, const struct ffa_uuid *uuid, const uint16_t start_index, const uint16_t tag) { struct vm *current_vm = current->vm; static struct ffa_partition_info partitions[2 * MAX_VMS]; bool uuid_is_null = ffa_uuid_is_null(uuid); ffa_vm_count_t vm_count = 0; struct ffa_value ret = ffa_error(FFA_INVALID_PARAMETERS); uint16_t max_idx = 0; uint16_t curr_idx = 0; uint8_t num_entries_to_ret = 0; uint8_t arg_idx = 3; /* list of pointers to args in return value */ uint64_t *arg_ptrs[] = { &(ret).func, &(ret).arg1, &(ret).arg2, &(ret).arg3, &(ret).arg4, &(ret).arg5, &(ret).arg6, &(ret).arg7, &(ret).extended_val.arg8, &(ret).extended_val.arg9, &(ret).extended_val.arg10, &(ret).extended_val.arg11, &(ret).extended_val.arg12, &(ret).extended_val.arg13, &(ret).extended_val.arg14, &(ret).extended_val.arg15, &(ret).extended_val.arg16, &(ret).extended_val.arg17, }; /* TODO: Add support for using tags */ if (tag != 0) { dlog_error("Tag not 0. Unsupported tag. %d\n", tag); return ffa_error(FFA_RETRY); } memset_s(&partitions, sizeof(partitions), 0, sizeof(partitions)); api_ffa_fill_partitions_info_array(partitions, ARRAY_SIZE(partitions), uuid, false, current_vm->id, &vm_count); /* If UUID is Null vm_count must not be zero at this stage. */ CHECK(!uuid_is_null || vm_count != 0); /* * When running the Hypervisor: * - If UUID is Null the Hypervisor forwards the query to the SPMC for * it to fill with secure partitions information. * When running the SPMC, the SPMC forwards the call to the SPMD to * discover any EL3 SPMD logical partitions, if the call came from an * SP. Otherwise, the call is not forwarded. * TODO: Note that for this ABI, forwarding on every invocation when * uuid is Null is inefficient,and if performance becomes a problem, * this would be a good place to optimize using strategies such as * caching info etc. For now, assuming this inefficiency is not a major * issue. * - If UUID is non-Null vm_count may be zero because the UUID matches * a secure partition and the query is forwarded to the SPMC. * When running the SPMC: * - If UUID is non-Null and vm_count is zero it means there is no such * partition identified in the system. */ if (vm_id_is_current_world(current_vm->id)) { if (!api_ffa_partition_info_get_regs_forward( uuid, tag, partitions, ARRAY_SIZE(partitions), &vm_count)) { dlog_error( "Failed to forward " "ffa_partition_info_get_regs.\n"); return ffa_error(FFA_DENIED); } } /* * Unrecognized UUID: does not match any of the VMs (or SPs) * and is not Null. */ if (vm_count == 0 || vm_count > ARRAY_SIZE(partitions)) { dlog_verbose( "Invalid parameters. vm_count = %d (must not be zero " "or > %d)\n", vm_count, ARRAY_SIZE(partitions)); return ffa_error(FFA_INVALID_PARAMETERS); } if (start_index >= vm_count) { dlog_error( "start index = %d vm_count = %d (start_index must be " "less than vm_count)\n", start_index, vm_count); return ffa_error(FFA_INVALID_PARAMETERS); } max_idx = vm_count - 1; num_entries_to_ret = (max_idx - start_index) + 1; num_entries_to_ret = MIN(num_entries_to_ret, MAX_INFO_REGS_ENTRIES_PER_CALL); curr_idx = start_index + num_entries_to_ret - 1; assert(curr_idx <= max_idx); ret.func = FFA_SUCCESS_64; ret.arg2 = (sizeof(struct ffa_partition_info) & 0xFFFF) << 48; ret.arg2 |= curr_idx << 16; ret.arg2 |= max_idx; if (num_entries_to_ret > 1) { ret.extended_val.valid = 1; } for (uint16_t idx = start_index; idx <= curr_idx; ++idx) { uint64_t *xn_0 = arg_ptrs[arg_idx++]; uint64_t *xn_1 = arg_ptrs[arg_idx++]; uint64_t *xn_2 = arg_ptrs[arg_idx++]; api_ffa_pack_vmid_count_props(xn_0, partitions[idx].vm_id, partitions[idx].vcpu_count, partitions[idx].properties); if (uuid_is_null) { api_ffa_pack_uuid(xn_1, xn_2, &partitions[idx].uuid); } assert(arg_idx <= ARRAY_SIZE(arg_ptrs)); } return ret; } struct ffa_value api_ffa_partition_info_get(struct vcpu *current, const struct ffa_uuid *uuid, const uint32_t flags) { struct vm *current_vm = current->vm; ffa_vm_count_t vm_count = 0; bool count_flag = (flags & FFA_PARTITION_COUNT_FLAG_MASK) == FFA_PARTITION_COUNT_FLAG; bool uuid_is_null = ffa_uuid_is_null(uuid); struct ffa_partition_info partitions[2 * MAX_VMS] = {0}; struct vm_locked vm_locked; struct ffa_value ret; /* Bits 31:1 Must Be Zero */ if ((flags & ~FFA_PARTITION_COUNT_FLAG_MASK) != 0) { return ffa_error(FFA_INVALID_PARAMETERS); } api_ffa_fill_partitions_info_array(partitions, ARRAY_SIZE(partitions), uuid, count_flag, current_vm->id, &vm_count); /* If UUID is Null vm_count must not be zero at this stage. */ CHECK(!uuid_is_null || vm_count != 0); /* * When running the Hypervisor: * - If UUID is Null the Hypervisor forwards the query to the SPMC for * it to fill with secure partitions information. * - If UUID is non-Null vm_count may be zero because the UUID matches * a secure partition and the query is forwarded to the SPMC. * When running the SPMC: * - If UUID is non-Null and vm_count is zero it means there is no such * partition identified in the system. */ plat_ffa_partition_info_get_forward(uuid, flags, partitions, &vm_count); /* * Unrecognized UUID: does not match any of the VMs (or SPs) * and is not Null. */ if (vm_count == 0) { return ffa_error(FFA_INVALID_PARAMETERS); } /* * If the count flag is set we don't need to return the partition info * descriptors. */ if (count_flag) { return (struct ffa_value){.func = FFA_SUCCESS_32, .arg2 = vm_count}; } vm_locked = vm_lock(current_vm); ret = send_versioned_partition_info_descriptors(vm_locked, partitions, vm_count); vm_unlock(&vm_locked); return ret; } /** * Returns the ID of the VM. */ struct ffa_value api_ffa_id_get(const struct vcpu *current) { return (struct ffa_value){.func = FFA_SUCCESS_32, .arg2 = current->vm->id}; } /** * Returns the SPMC FF-A ID at NS virtual/physical and secure virtual * FF-A instances. * DEN0077A FF-A v1.1 Beta0 section 13.9 FFA_SPM_ID_GET. */ struct ffa_value api_ffa_spm_id_get(void) { #if (MAKE_FFA_VERSION(1, 1) <= FFA_VERSION_COMPILED) /* * Return the SPMC ID that was fetched during FF-A * initialization. */ return (struct ffa_value){.func = FFA_SUCCESS_32, .arg2 = arch_ffa_spmc_id_get()}; #else return ffa_error(FFA_NOT_SUPPORTED); #endif } /** * This function is called by the architecture-specific context switching * function to indicate that register state for the given vCPU has been saved * and can therefore be used by other pCPUs. */ void api_regs_state_saved(struct vcpu *vcpu) { sl_lock(&vcpu->lock); vcpu->regs_available = true; sl_unlock(&vcpu->lock); } /** * Assuming that the arguments have already been checked by the caller, injects * a virtual interrupt of the given ID into the given target vCPU. This doesn't * cause the vCPU to actually be run immediately; it will be taken when the vCPU * is next run, which is up to the scheduler. * * Returns: * - 0 on success if no further action is needed. * - 1 if it was called by the primary VM and the primary VM now needs to wake * up or kick the target vCPU. */ int64_t api_interrupt_inject_locked(struct vcpu_locked target_locked, uint32_t intid, struct vcpu_locked current_locked, struct vcpu **next) { struct vcpu *target_vcpu = target_locked.vcpu; struct vcpu *current = current_locked.vcpu; struct interrupts *interrupts = &target_vcpu->interrupts; int64_t ret = 0; /* * We only need to change state and (maybe) trigger a virtual interrupt * if it is enabled and was not previously pending. Otherwise we can * skip everything except setting the pending bit. */ if (!(vcpu_is_virt_interrupt_enabled(interrupts, intid) && !vcpu_is_virt_interrupt_pending(interrupts, intid))) { goto out; } /* Increment the count. */ vcpu_interrupt_count_increment(target_locked, interrupts, intid); /* * Only need to update state if there was not already an * interrupt enabled and pending. */ if (vcpu_interrupt_count_get(target_locked) != 1) { goto out; } if (current->vm->id == HF_PRIMARY_VM_ID) { /* * If the call came from the primary VM, let it know that it * should run or kick the target vCPU. */ ret = 1; } else if (current != target_vcpu && next != NULL) { *next = api_wake_up_locked(current_locked, target_vcpu); } out: /* Either way, make it pending. */ vcpu_virt_interrupt_set_pending(interrupts, intid); return ret; } /** * Constructs the return value from a successful FFA_MSG_WAIT call, when used * with FFA_MSG_SEND_32. */ struct ffa_value ffa_msg_recv_return(const struct vm *receiver) { switch (receiver->mailbox.recv_func) { case FFA_MSG_SEND_32: return (struct ffa_value){ .func = FFA_MSG_SEND_32, .arg1 = (receiver->mailbox.recv_sender << 16) | receiver->id, .arg3 = receiver->mailbox.recv_size}; case FFA_MSG_SEND2_32: return (struct ffa_value){ .func = FFA_RUN_32, /* * TODO: FFA_RUN should return vCPU and VM ID in arg1. * Retrieving vCPU requires a rework of the function, * while receiver ID must be set because it's checked by * other APIs (eg: FFA_NOTIFICATION_GET). */ .arg1 = receiver->id}; default: /* This should never be reached, but return an error in case. */ dlog_error("Tried to return an invalid message function %#x\n", receiver->mailbox.recv_func); return ffa_error(FFA_DENIED); } } /** * Change the state of mailbox to empty, such that the ownership is given to the * Partition manager. * Returns true if the mailbox was reset successfully, false otherwise. */ static bool api_release_mailbox(struct vm_locked vm_locked, int32_t *error_code) { ffa_id_t vm_id = vm_locked.vm->id; int32_t error_code_to_ret = 0; switch (vm_locked.vm->mailbox.state) { case MAILBOX_STATE_EMPTY: dlog_verbose("Mailbox of %x is empty.\n", vm_id); error_code_to_ret = FFA_DENIED; break; case MAILBOX_STATE_FULL: /* Check it doesn't have pending RX full notifications. */ if (vm_are_fwk_notifications_pending(vm_locked)) { dlog_verbose( "Mailbox of endpoint %x has pending " "messages.\n", vm_id); error_code_to_ret = FFA_DENIED; } break; case MAILBOX_STATE_OTHER_WORLD_OWNED: /* * The SPMC shouldn't let SP's mailbox get into this state. * For the Hypervisor, the VM may call FFA_RX_RELEASE, whilst * the mailbox is in this state. In that case, we should report * error. */ if (vm_id_is_current_world(vm_id)) { dlog_verbose( "Mailbox of endpoint %x in a wrongful state.\n", vm_id); error_code_to_ret = FFA_ABORTED; } break; } if (error_code_to_ret != 0) { if (error_code != NULL) { *error_code = error_code_to_ret; } return false; } vm_locked.vm->mailbox.state = MAILBOX_STATE_EMPTY; return true; } /* * Helper to check if extended arguments (corresponding to regs x8-x17) * are zeroed out. */ bool api_extended_args_are_zero(struct ffa_value *args) { if (args->extended_val.arg8 != 0U || args->extended_val.arg9 != 0U || args->extended_val.arg10 != 0U || args->extended_val.arg11 != 0U || args->extended_val.arg12 != 0U || args->extended_val.arg13 != 0U || args->extended_val.arg14 != 0U || args->extended_val.arg15 != 0U || args->extended_val.arg16 != 0U || args->extended_val.arg17 != 0U) { return false; } return true; } struct ffa_value api_ffa_msg_wait(struct vcpu *current, struct vcpu **next, struct ffa_value *args) { struct vcpu_locked current_locked; enum vcpu_state next_state = VCPU_STATE_RUNNING; struct ffa_value ret; struct vcpu_locked next_locked = (struct vcpu_locked){ .vcpu = NULL, }; if (args->arg1 != 0U || args->arg2 != 0U || args->arg3 != 0U || args->arg4 != 0U || args->arg5 != 0U || args->arg6 != 0U || args->arg7 != 0U) { return ffa_error(FFA_INVALID_PARAMETERS); } if (current->vm->ffa_version >= MAKE_FFA_VERSION(1, 2) && !api_extended_args_are_zero(args)) { return ffa_error(FFA_INVALID_PARAMETERS); } current_locked = vcpu_lock(current); if (!plat_ffa_check_runtime_state_transition( current_locked, current->vm->id, HF_INVALID_VM_ID, next_locked, FFA_MSG_WAIT_32, &next_state)) { ret = ffa_error(FFA_DENIED); goto out; } assert(!vm_id_is_current_world(current->vm->id) || next_state == VCPU_STATE_WAITING); ret = plat_ffa_msg_wait_prepare(current_locked, next); out: vcpu_unlock(¤t_locked); return ret; } /** * Prepares the vCPU to run by updating its state and fetching whether a return * value needs to be forced onto the vCPU. */ static bool api_vcpu_prepare_run(struct vcpu_locked current_locked, struct vcpu_locked vcpu_next_locked, struct ffa_value *run_ret) { struct vm_locked vm_locked; bool ret; uint64_t timer_remaining_ns = FFA_SLEEP_INDEFINITE; bool vcpu_was_init_state = false; bool need_vm_lock; struct two_vcpu_locked vcpus_locked; /* * Check that the registers are available so that the vCPU can be run. * * The VM lock is not needed in the common case so it must only be taken * when it is going to be needed. This ensures there are no inter-vCPU * dependencies in the common run case meaning the sensitive context * switch performance is consistent. */ struct vcpu *vcpu = vcpu_next_locked.vcpu; struct vcpu *current = current_locked.vcpu; /* The VM needs to be locked to deliver mailbox messages. */ need_vm_lock = vcpu->state == VCPU_STATE_WAITING || (!vcpu->vm->el0_partition && (vcpu->state == VCPU_STATE_BLOCKED_INTERRUPT || vcpu->state == VCPU_STATE_BLOCKED || vcpu->state == VCPU_STATE_PREEMPTED)); if (need_vm_lock) { vcpu_unlock(&vcpu_next_locked); vcpu_unlock(¤t_locked); vm_locked = vm_lock(vcpu->vm); /* Lock both vCPUs at once to avoid deadlock. */ vcpus_locked = vcpu_lock_both(current, vcpu); current_locked = vcpus_locked.vcpu1; vcpu_next_locked = vcpus_locked.vcpu2; } /* * If the vCPU is already running somewhere then we can't run it here * simultaneously. While it is actually running then the state should be * `VCPU_STATE_RUNNING` and `regs_available` should be false. Once it * stops running but while Hafnium is in the process of switching back * to the primary there will be a brief period while the state has been * updated but `regs_available` is still false (until * `api_regs_state_saved` is called). We can't start running it again * until this has finished, so count this state as still running for the * purposes of this check. */ if (vcpu->state == VCPU_STATE_RUNNING || !vcpu->regs_available) { /* * vCPU is running on another pCPU. * * It's okay not to return the sleep duration here because the * other physical CPU that is currently running this vCPU will * return the sleep duration if needed. */ *run_ret = ffa_error(FFA_BUSY); ret = false; goto out; } if (atomic_load_explicit(&vcpu->vm->aborting, memory_order_relaxed)) { if (vcpu->state != VCPU_STATE_ABORTED) { dlog_verbose("VM %#x was aborted, cannot run vCPU %u\n", vcpu->vm->id, vcpu_index(vcpu)); vcpu->state = VCPU_STATE_ABORTED; } *run_ret = ffa_error(FFA_ABORTED); ret = false; goto out; } switch (vcpu->state) { case VCPU_STATE_RUNNING: case VCPU_STATE_OFF: case VCPU_STATE_ABORTED: ret = false; goto out; case VCPU_STATE_WAITING: /* * An initial FFA_RUN is necessary for SP's secondary vCPUs to * reach the message wait loop. */ if (vcpu->rt_model == RTM_SP_INIT) { /* * TODO: this should be removed, but omitting it makes * normal world arch gicv3 tests failing. */ vcpu->rt_model = RTM_NONE; vcpu_was_init_state = true; break; } assert(need_vm_lock == true); if (!vm_locked.vm->el0_partition && plat_ffa_inject_notification_pending_interrupt( vcpu_next_locked, current_locked, vm_locked)) { /* TODO: setting a return value to override * the placeholder (FFA_ERROR(INTERRUPTED)) * set by FFA_MSG_WAIT. FF-A v1.1 allows * FFA_MSG_WAIT to successfully return even if * it didn't receive a message. TFTF tests are * still expecting an FFA_ERROR instead, * should be fixed? */ arch_regs_set_retval( &vcpu->regs, (struct ffa_value){.func = FFA_RUN_32, // TODO: does it make sense // to set vCPU/receiver? .arg1 = 0}); break; } /* * A pending message allows the vCPU to run so the message can * be delivered directly. */ if (vcpu->vm->mailbox.state == MAILBOX_STATE_FULL) { arch_regs_set_retval(&vcpu->regs, ffa_msg_recv_return(vcpu->vm)); break; } if (vcpu_interrupt_count_get(vcpu_next_locked) > 0) { break; } if (arch_timer_enabled(&vcpu->regs)) { timer_remaining_ns = arch_timer_remaining_ns(&vcpu->regs); if (timer_remaining_ns == 0) { break; } } else { dlog_verbose("Timer disabled\n"); } run_ret->func = FFA_MSG_WAIT_32; run_ret->arg1 = ffa_vm_vcpu(vcpu->vm->id, vcpu_index(vcpu)); run_ret->arg2 = timer_remaining_ns; ret = false; goto out; case VCPU_STATE_BLOCKED_INTERRUPT: if (need_vm_lock && plat_ffa_inject_notification_pending_interrupt( vcpu_next_locked, current_locked, vm_locked)) { assert(vcpu_interrupt_count_get(vcpu_next_locked) > 0); break; } /* Allow virtual interrupts to be delivered. */ if (vcpu_interrupt_count_get(vcpu_next_locked) > 0) { break; } if (arch_timer_enabled(&vcpu->regs)) { timer_remaining_ns = arch_timer_remaining_ns(&vcpu->regs); /* * The timer expired so allow the interrupt to be * delivered. */ if (timer_remaining_ns == 0) { break; } } /* * The vCPU is not ready to run, return the appropriate code to * the primary which called vcpu_run. */ run_ret->func = HF_FFA_RUN_WAIT_FOR_INTERRUPT; run_ret->arg1 = ffa_vm_vcpu(vcpu->vm->id, vcpu_index(vcpu)); run_ret->arg2 = timer_remaining_ns; ret = false; goto out; case VCPU_STATE_BLOCKED: /* A blocked vCPU is run unconditionally. Fall through. */ case VCPU_STATE_PREEMPTED: /* Check NPI is to be injected here. */ if (need_vm_lock) { plat_ffa_inject_notification_pending_interrupt( vcpu_next_locked, current_locked, vm_locked); } break; default: /* * Execution not expected to reach here. Deny the request * gracefully. */ *run_ret = ffa_error(FFA_DENIED); ret = false; goto out; } plat_ffa_init_schedule_mode_ffa_run(current_locked, vcpu_next_locked); /* It has been decided that the vCPU should be run. */ vcpu->cpu = current_locked.vcpu->cpu; vcpu->state = VCPU_STATE_RUNNING; if (vcpu_was_init_state) { vcpu_set_phys_core_idx(vcpu); vcpu_set_boot_info_gp_reg(vcpu); } /* * Mark the registers as unavailable now that we're about to reflect * them onto the real registers. This will also prevent another physical * CPU from trying to read these registers. */ vcpu->regs_available = false; ret = true; out: if (need_vm_lock) { vm_unlock(&vm_locked); } return ret; } struct ffa_value api_ffa_run(ffa_id_t vm_id, ffa_vcpu_index_t vcpu_idx, struct vcpu *current, struct vcpu **next) { struct vm *vm; struct vcpu *vcpu; struct ffa_value ret = ffa_error(FFA_INVALID_PARAMETERS); enum vcpu_state next_state = VCPU_STATE_RUNNING; struct vcpu_locked current_locked; struct vcpu_locked vcpu_next_locked; struct two_vcpu_locked vcpus_locked; current_locked = vcpu_lock(current); if (!plat_ffa_run_checks(current_locked, vm_id, vcpu_idx, &ret, next)) { goto out; } if (plat_ffa_run_forward(vm_id, vcpu_idx, &ret)) { goto out; } /* The requested VM must exist. */ vm = vm_find(vm_id); if (vm == NULL) { goto out; } /* The requested vCPU must exist. */ if (vcpu_idx >= vm->vcpu_count) { goto out; } /* * Refer Figure 8.13 Scenario 1 of the FF-A v1.1 EAC spec. SPMC * bypasses the intermediate execution contexts and resumes the * SP execution context that was originally preempted. */ if (*next != NULL) { vcpu = *next; } else { vcpu = vm_get_vcpu(vm, vcpu_idx); } /* * Unlock current vCPU to allow it to be locked together with next * vcpu. */ vcpu_unlock(¤t_locked); /* Lock both vCPUs at once to avoid deadlock. */ vcpus_locked = vcpu_lock_both(current, vcpu); current_locked = vcpus_locked.vcpu1; vcpu_next_locked = vcpus_locked.vcpu2; if (!plat_ffa_check_runtime_state_transition( current_locked, current->vm->id, HF_INVALID_VM_ID, vcpu_next_locked, FFA_RUN_32, &next_state)) { ret = ffa_error(FFA_DENIED); goto out_vcpu; } if (!api_vcpu_prepare_run(current_locked, vcpu_next_locked, &ret)) { goto out_vcpu; } /* * Inject timer interrupt if timer has expired. It's safe to access * vcpu->regs here because api_vcpu_prepare_run already made sure that * regs_available was true (and then set it to false) before returning * true. */ if (arch_timer_pending(&vcpu->regs)) { /* Make virtual timer interrupt pending. */ api_interrupt_inject_locked(vcpu_next_locked, HF_VIRTUAL_TIMER_INTID, vcpu_next_locked, NULL); /* * Set the mask bit so the hardware interrupt doesn't fire * again. Ideally we wouldn't do this because it affects what * the secondary vCPU sees, but if we don't then we end up with * a loop of the interrupt firing each time we try to return to * the secondary vCPU. */ arch_timer_mask(&vcpu->regs); } /* Switch to the vCPU. */ *next = vcpu; assert(!vm_id_is_current_world(current->vm->id) || next_state == VCPU_STATE_BLOCKED); current->state = VCPU_STATE_BLOCKED; /* * Set a placeholder return code to the scheduler. This will be * overwritten when the switch back to the primary occurs. */ ret.func = FFA_INTERRUPT_32; ret.arg1 = 0; ret.arg2 = 0; out_vcpu: vcpu_unlock(&vcpu_next_locked); out: vcpu_unlock(¤t_locked); return ret; } /** * Check that the mode indicates memory that is valid, owned and exclusive. */ static bool api_mode_valid_owned_and_exclusive(uint32_t mode) { return (mode & (MM_MODE_D | MM_MODE_INVALID | MM_MODE_UNOWNED | MM_MODE_SHARED)) == 0; } /** * Configures the hypervisor's stage-1 view of the send and receive pages. */ static struct ffa_value api_vm_configure_stage1( struct mm_stage1_locked mm_stage1_locked, struct vm_locked vm_locked, paddr_t pa_send_begin, paddr_t pa_send_end, paddr_t pa_recv_begin, paddr_t pa_recv_end, uint32_t extra_attributes, struct mpool *local_page_pool) { struct ffa_value ret; /* * Map the send page as read-only in the SPMC/hypervisor address space. */ vm_locked.vm->mailbox.send = mm_identity_map(mm_stage1_locked, pa_send_begin, pa_send_end, MM_MODE_R | extra_attributes, local_page_pool); if (!vm_locked.vm->mailbox.send) { ret = ffa_error(FFA_NO_MEMORY); goto out; } /* * Map the receive page as writable in the SPMC/hypervisor address * space. On failure, unmap the send page before returning. */ vm_locked.vm->mailbox.recv = mm_identity_map(mm_stage1_locked, pa_recv_begin, pa_recv_end, MM_MODE_W | extra_attributes, local_page_pool); if (!vm_locked.vm->mailbox.recv) { ret = ffa_error(FFA_NO_MEMORY); goto fail_undo_send; } ret = (struct ffa_value){.func = FFA_SUCCESS_32}; goto out; /* * The following mappings will not require more memory than is available * in the local pool. */ fail_undo_send: vm_locked.vm->mailbox.send = NULL; CHECK(mm_unmap(mm_stage1_locked, pa_send_begin, pa_send_end, local_page_pool)); out: return ret; } /** * Sanity checks and configures the send and receive pages in the VM stage-2 * and hypervisor stage-1 page tables. * * Returns: * - FFA_ERROR FFA_INVALID_PARAMETERS if the given addresses are not properly * aligned, are the same or have invalid attributes. * - FFA_ERROR FFA_NO_MEMORY if the hypervisor was unable to map the buffers * due to insuffient page table memory. * - FFA_ERROR FFA_DENIED if the pages are already mapped. * - FFA_SUCCESS on success if no further action is needed. */ struct ffa_value api_vm_configure_pages( struct mm_stage1_locked mm_stage1_locked, struct vm_locked vm_locked, ipaddr_t send, ipaddr_t recv, uint32_t page_count, struct mpool *local_page_pool) { struct ffa_value ret; paddr_t pa_send_begin; paddr_t pa_send_end; paddr_t pa_recv_begin; paddr_t pa_recv_end; uint32_t orig_send_mode = 0; uint32_t orig_recv_mode = 0; uint32_t extra_attributes; /* We only allow these to be setup once. */ if (vm_locked.vm->mailbox.send || vm_locked.vm->mailbox.recv) { dlog_error("%s: Mailboxes have already been setup for VM %#x\n", __func__, vm_locked.vm->id); ret = ffa_error(FFA_DENIED); goto out; } /* Hafnium only supports a fixed size of RX/TX buffers. */ if (page_count != HF_MAILBOX_SIZE / FFA_PAGE_SIZE) { dlog_error("%s: Page count must be %d, it is %d\n", __func__, HF_MAILBOX_SIZE / FFA_PAGE_SIZE, page_count); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* Fail if addresses are not page-aligned. */ if (!is_aligned(ipa_addr(send), PAGE_SIZE) || !is_aligned(ipa_addr(recv), PAGE_SIZE)) { dlog_error("%s: Mailbox buffers not page-aligned\n", __func__); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* Convert to physical addresses. */ pa_send_begin = pa_from_ipa(send); pa_send_end = pa_add(pa_send_begin, HF_MAILBOX_SIZE); pa_recv_begin = pa_from_ipa(recv); pa_recv_end = pa_add(pa_recv_begin, HF_MAILBOX_SIZE); /* Fail if the same page is used for the send and receive pages. */ if (pa_addr(pa_send_begin) == pa_addr(pa_recv_begin)) { dlog_error("%s: Mailbox buffers overlap\n", __func__); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* Set stage 2 translation tables only for virtual FF-A instances. */ if (vm_id_is_current_world(vm_locked.vm->id)) { /* * Ensure the pages are valid, owned and exclusive to the VM and * that the VM has the required access to the memory. */ if (!vm_mem_get_mode(vm_locked, send, ipa_add(send, PAGE_SIZE), &orig_send_mode) || !api_mode_valid_owned_and_exclusive(orig_send_mode) || (orig_send_mode & MM_MODE_R) == 0 || (orig_send_mode & MM_MODE_W) == 0) { dlog_error( "VM doesn't have required access rights to map " "TX buffer in stage 2.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } if (!vm_mem_get_mode(vm_locked, recv, ipa_add(recv, PAGE_SIZE), &orig_recv_mode) || !api_mode_valid_owned_and_exclusive(orig_recv_mode) || (orig_recv_mode & MM_MODE_R) == 0) { dlog_error( "VM doesn't have required access rights to map " "RX buffer in stage 2.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* Take memory ownership away from the VM and mark as shared. */ uint32_t mode = MM_MODE_UNOWNED | MM_MODE_SHARED | MM_MODE_R | MM_MODE_W; if (vm_locked.vm->el0_partition) { mode |= MM_MODE_USER | MM_MODE_NG; } if (!vm_identity_map(vm_locked, pa_send_begin, pa_send_end, mode, local_page_pool, NULL)) { dlog_error( "Cannot allocate a new entry in stage 2 " "translation table.\n"); ret = ffa_error(FFA_NO_MEMORY); goto out; } mode = MM_MODE_UNOWNED | MM_MODE_SHARED | MM_MODE_R; if (vm_locked.vm->el0_partition) { mode |= MM_MODE_USER | MM_MODE_NG; } if (!vm_identity_map(vm_locked, pa_recv_begin, pa_recv_end, mode, local_page_pool, NULL)) { /* TODO: partial defrag of failed range. */ /* Recover any memory consumed in failed mapping. */ dlog_error("%s: cannot map recv page\n", __func__); vm_ptable_defrag(vm_locked, local_page_pool); ret = ffa_error(FFA_NO_MEMORY); goto fail_undo_send; } } else { ret = arch_other_world_vm_configure_rxtx_map( vm_locked, local_page_pool, pa_send_begin, pa_send_end, pa_recv_begin, pa_recv_end); if (ret.func != FFA_SUCCESS_32) { goto out; } } /* Get extra send/recv pages mapping attributes for the given VM ID. */ extra_attributes = arch_mm_extra_attributes_from_vm(vm_locked.vm->id); /* * For EL0 partitions, since both the partition and the hypervisor code * use the EL2&0 translation regime, it is critical to mark the mappings * of the send and recv buffers as non-global in the TLB. For one, if we * dont mark it as non-global, it would cause TLB conflicts since there * would be an identity mapping with non-global attribute in the * partitions page tables, but another identity mapping in the * hypervisor page tables with the global attribute. The other issue is * one of security, we dont want other partitions to be able to access * other partitions buffers through cached translations. */ if (vm_locked.vm->el0_partition) { extra_attributes |= MM_MODE_NG; } ret = api_vm_configure_stage1( mm_stage1_locked, vm_locked, pa_send_begin, pa_send_end, pa_recv_begin, pa_recv_end, extra_attributes, local_page_pool); if (ret.func != FFA_SUCCESS_32) { goto fail_undo_send_and_recv; } ret = (struct ffa_value){.func = FFA_SUCCESS_32}; goto out; fail_undo_send_and_recv: CHECK(vm_identity_map(vm_locked, pa_recv_begin, pa_recv_end, orig_recv_mode, local_page_pool, NULL)); fail_undo_send: CHECK(vm_identity_map(vm_locked, pa_send_begin, pa_send_end, orig_send_mode, local_page_pool, NULL)); out: return ret; } /** * Read the buffer addresses and VM ID of an FFA_RXTX_MAP request. Handles * forwarded messages by reading from the hypervisor's TX buffer. * * Returns the VM/SP ID on success. * * Returns `HF_INVALID_VM_ID` when the arguments provided via the ABI * FFA_RXTX_MAP indicate the SPMC should retrieve the RXTX description from the * Hypervisor RXTX buffers, and the hypervisor hasn't given its own RXTX buffers * for the SPMC to map. */ static ffa_id_t api_get_rxtx_description(struct vm *current_vm, ipaddr_t *send, ipaddr_t *recv, uint32_t *page_count) { bool forwarded; struct vm_locked vm_locked; ffa_id_t owner_vm_id; struct ffa_endpoint_rx_tx_descriptor *endpoint_desc; struct ffa_composite_memory_region *rx_region; struct ffa_composite_memory_region *tx_region; /* * If the message has been forwarded the effective addresses are in * hypervisor's TX buffer. */ forwarded = (current_vm->id == HF_OTHER_WORLD_ID) && (ipa_addr(*send) == 0) && (ipa_addr(*recv) == 0) && (*page_count == 0); if (forwarded) { vm_locked = vm_lock(current_vm); endpoint_desc = (struct ffa_endpoint_rx_tx_descriptor *) vm_locked.vm->mailbox.send; if (endpoint_desc == NULL) { dlog_error( "Trying to access RXTX description, but " "hypervisor has not provided RXTX buffers\n"); vm_unlock(&vm_locked); return HF_INVALID_VM_ID; } rx_region = ffa_endpoint_get_rx_memory_region(endpoint_desc); tx_region = ffa_endpoint_get_tx_memory_region(endpoint_desc); owner_vm_id = endpoint_desc->endpoint_id; *recv = ipa_init(rx_region->constituents[0].address); *send = ipa_init(tx_region->constituents[0].address); *page_count = rx_region->constituents[0].page_count; vm_unlock(&vm_locked); } else { owner_vm_id = current_vm->id; } return owner_vm_id; } /** * Configures the VM to send/receive data through the specified pages. The pages * must not be shared. Locking of the page tables combined with a local memory * pool ensures there will always be enough memory to recover from any errors * that arise. The stage-1 page tables must be locked so memory cannot be taken * by another core which could result in this transaction being unable to roll * back in the case of an error. * * Returns: * - FFA_ERROR FFA_INVALID_PARAMETERS if the given addresses are not properly * aligned, are the same or have invalid attributes. * - FFA_ERROR FFA_NO_MEMORY if the hypervisor was unable to map the buffers * due to insuffient page table memory. * - FFA_ERROR FFA_DENIED if the pages are already mapped. * - FFA_SUCCESS on success if no further action is needed. */ struct ffa_value api_ffa_rxtx_map(ipaddr_t send, ipaddr_t recv, uint32_t page_count, struct vcpu *current) { struct ffa_value ret; struct vm_locked owner_vm_locked; struct mm_stage1_locked mm_stage1_locked; struct mpool local_page_pool; ffa_id_t owner_vm_id; /* * Get the original buffer addresses and VM ID in case of forwarded * message. */ owner_vm_id = api_get_rxtx_description(current->vm, &send, &recv, &page_count); if (owner_vm_id == HF_INVALID_VM_ID) { return ffa_error(FFA_INVALID_PARAMETERS); } owner_vm_locked = plat_ffa_vm_find_locked_create(owner_vm_id); if (owner_vm_locked.vm == NULL) { dlog_error("Cannot map RX/TX for VM ID %#x, not found.\n", owner_vm_id); return ffa_error(FFA_DENIED); } /* * Create a local pool so any freed memory can't be used by another * thread. This is to ensure the original mapping can be restored if any * stage of the process fails. */ mpool_init_with_fallback(&local_page_pool, &api_page_pool); mm_stage1_locked = mm_lock_stage1(); ret = api_vm_configure_pages(mm_stage1_locked, owner_vm_locked, send, recv, page_count, &local_page_pool); if (ret.func != FFA_SUCCESS_32) { goto exit; } /* Forward buffer mapping to SPMC if coming from a VM. */ plat_ffa_rxtx_map_forward(owner_vm_locked); ret = (struct ffa_value){.func = FFA_SUCCESS_32}; exit: mpool_fini(&local_page_pool); mm_unlock_stage1(&mm_stage1_locked); vm_unlock(&owner_vm_locked); return ret; } /** * Unmaps the RX/TX buffer pair with a partition or partition manager from the * translation regime of the caller. Unmap the region for the hypervisor and * set the memory region to owned and exclusive for the component. Since the * memory region mapped in the page table, when the buffers were originally * created we can safely remap it. * * Returns: * - FFA_ERROR FFA_INVALID_PARAMETERS if there is no buffer pair registered on * behalf of the caller. * - FFA_SUCCESS on success if no further action is needed. */ struct ffa_value api_ffa_rxtx_unmap(ffa_id_t allocator_id, struct vcpu *current) { struct vm *vm = current->vm; struct vm_locked vm_locked; ffa_id_t owner_vm_id; struct mm_stage1_locked mm_stage1_locked; paddr_t send_pa_begin; paddr_t send_pa_end; paddr_t recv_pa_begin; paddr_t recv_pa_end; struct ffa_value ret = (struct ffa_value){.func = FFA_SUCCESS_32}; if (vm->id == HF_HYPERVISOR_VM_ID && !ffa_is_vm_id(allocator_id)) { dlog_verbose( "The Hypervisor must specify a valid VM ID in register " "W1, if FFA_RXTX_UNMAP call forwarded to SPM.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } /* Ensure `allocator_id` is set only at Non-Secure Physical instance. */ if (vm_id_is_current_world(vm->id) && (allocator_id != 0)) { dlog_error( "The register W1 (containing ID) must be 0 at virtual " "instances.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } /* VM ID of which buffers have to be unmapped. */ owner_vm_id = (allocator_id != 0) ? allocator_id : vm->id; vm_locked = plat_ffa_vm_find_locked(owner_vm_id); vm = vm_locked.vm; if (vm == NULL) { dlog_error("Cannot unmap RX/TX for VM ID %#x, not found.\n", owner_vm_id); return ffa_error(FFA_INVALID_PARAMETERS); } /* Get send and receive buffers. */ if (vm->mailbox.send == NULL || vm->mailbox.recv == NULL) { dlog_verbose( "No buffer pair registered on behalf of the caller.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* Currently a mailbox size of 1 page is assumed. */ send_pa_begin = pa_from_va(va_from_ptr(vm->mailbox.send)); send_pa_end = pa_add(send_pa_begin, HF_MAILBOX_SIZE); recv_pa_begin = pa_from_va(va_from_ptr(vm->mailbox.recv)); recv_pa_end = pa_add(recv_pa_begin, HF_MAILBOX_SIZE); mm_stage1_locked = mm_lock_stage1(); /* Reset stage 2 mapping only for virtual FF-A instances. */ if (vm_id_is_current_world(owner_vm_id)) { /* * Set the memory region of the buffers back to the default mode * for the VM. Since this memory region was already mapped for * the RXTX buffers we can safely remap them. */ CHECK(vm_identity_map(vm_locked, send_pa_begin, send_pa_end, MM_MODE_R | MM_MODE_W | MM_MODE_X, &api_page_pool, NULL)); CHECK(vm_identity_map(vm_locked, recv_pa_begin, recv_pa_end, MM_MODE_R | MM_MODE_W | MM_MODE_X, &api_page_pool, NULL)); } else { ret = arch_other_world_vm_configure_rxtx_unmap( vm_locked, &api_page_pool, send_pa_begin, send_pa_end, recv_pa_begin, recv_pa_end); if (ret.func != FFA_SUCCESS_32) { goto out; } } /* Unmap the buffers in the partition manager. */ CHECK(mm_unmap(mm_stage1_locked, send_pa_begin, send_pa_end, &api_page_pool)); CHECK(mm_unmap(mm_stage1_locked, recv_pa_begin, recv_pa_end, &api_page_pool)); vm->mailbox.send = NULL; vm->mailbox.recv = NULL; plat_ffa_vm_destroy(vm_locked); /* Forward buffer unmapping to SPMC if coming from a VM. */ plat_ffa_rxtx_unmap_forward(vm_locked); mm_unlock_stage1(&mm_stage1_locked); out: vm_unlock(&vm_locked); return ret; } /** * Copies data from the sender's send buffer to the recipient's receive buffer * and notifies the receiver. */ struct ffa_value api_ffa_msg_send2(ffa_id_t sender_vm_id, uint32_t flags, struct vcpu *current) { struct vm *from = current->vm; struct vm *to; struct vm_locked to_locked; ffa_id_t msg_sender_id; struct vm_locked sender_locked; const void *from_msg; struct ffa_value ret; struct ffa_partition_rxtx_header header; ffa_id_t sender_id; ffa_id_t receiver_id; uint32_t msg_size; ffa_notifications_bitmap_t rx_buffer_full; /* Only Hypervisor can set `sender_vm_id` when forwarding messages. */ if (from->id != HF_HYPERVISOR_VM_ID && sender_vm_id != 0) { dlog_error("Sender VM ID must be zero.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } /* * Get message sender's mailbox, which can be different to the `from` vm * when the message is forwarded. */ msg_sender_id = (sender_vm_id != 0) ? sender_vm_id : from->id; sender_locked = plat_ffa_vm_find_locked(msg_sender_id); if (sender_locked.vm == NULL) { dlog_error("Cannot send message from VM ID %#x, not found.\n", msg_sender_id); return ffa_error(FFA_DENIED); } from_msg = sender_locked.vm->mailbox.send; if (from_msg == NULL) { dlog_error("Cannot retrieve TX buffer for VM ID %#x.\n", msg_sender_id); ret = ffa_error(FFA_DENIED); goto out_unlock_sender; } /* * Copy message header as safety measure to avoid multiple accesses to * unsafe memory which could be 'corrupted' between safety checks and * final buffer copy. */ if (!memcpy_trapped(&header, FFA_RXTX_HEADER_SIZE, from_msg, FFA_RXTX_HEADER_SIZE)) { dlog_error( "%s: Failed to copy message from sender's(%x) TX " "buffer.\n", __func__, sender_locked.vm->id); ret = ffa_error(FFA_ABORTED); goto out_unlock_sender; } sender_id = ffa_rxtx_header_sender(&header); receiver_id = ffa_rxtx_header_receiver(&header); /* Ensure Sender IDs from API and from message header match. */ if (msg_sender_id != sender_id) { dlog_error( "Message sender VM ID (%#x) doesn't match header's VM " "ID (%#x).\n", msg_sender_id, sender_id); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out_unlock_sender; } /* Disallow reflexive requests as this suggests an error in the VM. */ if (receiver_id == sender_id) { dlog_error("Sender and receive VM IDs must be different.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out_unlock_sender; } /* `flags` can be set only at secure virtual FF-A instances. */ if (ffa_is_vm_id(sender_id) && (flags != 0)) { dlog_error("flags must be zero.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } if (header.offset != FFA_RXTX_HEADER_SIZE) { dlog_error("Indirect msg payload must follow the header.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } /* * Check if the message has to be forwarded to the SPMC, in * this case return, the SPMC will handle the buffer copy. */ if (plat_ffa_msg_send2_forward(receiver_id, sender_id, &ret)) { goto out_unlock_sender; } /* Ensure the receiver VM exists. */ to_locked = plat_ffa_vm_find_locked(receiver_id); to = to_locked.vm; if (to == NULL) { dlog_error("Cannot deliver message to VM %#x, not found.\n", receiver_id); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out_unlock_sender; } /* * Check sender and receiver can use indirect messages. * Sender is the VM/SP who originally sent the message, not the * hypervisor possibly relaying it. */ if (!plat_ffa_is_indirect_msg_supported(sender_locked, to_locked)) { dlog_verbose("VM %#x doesn't support indirect message\n", sender_id); ret = ffa_error(FFA_DENIED); goto out; } if (vm_is_mailbox_busy(to_locked)) { dlog_error( "Cannot deliver message to VM %#x, RX buffer not " "ready.\n", receiver_id); ret = ffa_error(FFA_BUSY); goto out; } /* Acquire receiver's RX buffer. */ if (!plat_ffa_acquire_receiver_rx(to_locked, &ret)) { dlog_error("Failed to acquire RX buffer for VM %#x\n", to->id); goto out; } /* Check the size of transfer. */ msg_size = FFA_RXTX_HEADER_SIZE + header.size; if ((msg_size > FFA_MSG_PAYLOAD_MAX) || (header.size > FFA_PARTITION_MSG_PAYLOAD_MAX)) { dlog_error("Message is too big.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* Copy data. */ if (!memcpy_trapped(to->mailbox.recv, FFA_MSG_PAYLOAD_MAX, from_msg, msg_size)) { dlog_error( "%s: Failed to copy message to receiver's(%x) RX " "buffer.\n", __func__, to->id); ret = ffa_error(FFA_ABORTED); goto out; } to->mailbox.recv_size = msg_size; to->mailbox.recv_sender = sender_id; to->mailbox.recv_func = FFA_MSG_SEND2_32; to->mailbox.state = MAILBOX_STATE_FULL; rx_buffer_full = ffa_is_vm_id(sender_id) ? FFA_NOTIFICATION_HYP_BUFFER_FULL_MASK : FFA_NOTIFICATION_SPM_BUFFER_FULL_MASK; vm_notifications_framework_set_pending(to_locked, rx_buffer_full); if ((FFA_NOTIFICATIONS_FLAG_DELAY_SRI & flags) == 0) { dlog_verbose("SRI was NOT delayed. vcpu: %u!\n", vcpu_index(current)); plat_ffa_sri_trigger_not_delayed(current->cpu); } else { plat_ffa_sri_state_set(DELAYED); } ret = (struct ffa_value){.func = FFA_SUCCESS_32}; out: vm_unlock(&to_locked); out_unlock_sender: vm_unlock(&sender_locked); return ret; } /** * Releases the caller's mailbox so that a new message can be received. The * caller must have copied out all data they wish to preserve as new messages * will overwrite the old and will arrive asynchronously. * * Returns: * - FFA_ERROR FFA_INVALID_PARAMETERS if message is forwarded to SPMC but * there's no buffer pair mapped. * - FFA_ERROR FFA_DENIED on failure, if the mailbox hasn't been read. * - FFA_SUCCESS on success if no further action is needed. * - FFA_RX_RELEASE if it was called by the primary VM and the primary VM now * needs to wake up or kick waiters. Waiters should be retrieved by calling * hf_mailbox_waiter_get. */ struct ffa_value api_ffa_rx_release(ffa_id_t receiver_id, struct vcpu *current) { struct vm *current_vm = current->vm; struct vm *vm; struct vm_locked vm_locked; ffa_id_t current_vm_id = current_vm->id; ffa_id_t release_vm_id; struct ffa_value ret; int32_t error_code; /* `receiver_id` can be set only at Non-Secure Physical interface. */ if (vm_id_is_current_world(current_vm_id) && (receiver_id != 0)) { dlog_error("Invalid `receiver_id`, must be zero.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } /* * VM ID to be released: `receiver_id` if message has been forwarded by * Hypervisor to release a VM's buffer, current VM ID otherwise. */ if (vm_id_is_current_world(current_vm_id) || (receiver_id == 0)) { release_vm_id = current_vm_id; } else { release_vm_id = receiver_id; } vm_locked = plat_ffa_vm_find_locked(release_vm_id); vm = vm_locked.vm; if (vm == NULL) { dlog_error("No buffer registered for VM ID %#x.\n", release_vm_id); return ffa_error(FFA_INVALID_PARAMETERS); } if (plat_ffa_rx_release_forward(vm_locked, &ret)) { goto out; } if (!api_release_mailbox(vm_locked, &error_code)) { ret = ffa_error(error_code); goto out; } ret = (struct ffa_value){.func = FFA_SUCCESS_32}; out: vm_unlock(&vm_locked); return ret; } /** * Acquire ownership of an RX buffer before writing to it. Both * Hypervisor and SPMC are producers of VM's RX buffer, and they * could contend for the same buffer. SPMC owns VM's RX buffer after * it's mapped in its translation regime. This ABI should be * used by the Hypervisor to get the ownership of a VM's RX buffer * from the SPMC solving the aforementioned possible contention. * * Returns: * - FFA_DENIED: callee cannot relinquish ownership of RX buffer. * - FFA_INVALID_PARAMETERS: there is no buffer pair registered for the VM. * - FFA_NOT_SUPPORTED: function not implemented at the FF-A instance. */ struct ffa_value api_ffa_rx_acquire(ffa_id_t receiver_id, struct vcpu *current) { struct vm_locked receiver_locked; struct vm *receiver; struct ffa_value ret; if ((current->vm->id != HF_HYPERVISOR_VM_ID) || !ffa_is_vm_id(receiver_id)) { dlog_error( "FFA_RX_ACQUIRE not supported at this FF-A " "instance.\n"); return ffa_error(FFA_NOT_SUPPORTED); } receiver_locked = plat_ffa_vm_find_locked(receiver_id); receiver = receiver_locked.vm; if (receiver == NULL || receiver->mailbox.recv == NULL) { dlog_error("Cannot retrieve RX buffer for VM ID %#x.\n", receiver_id); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } if (receiver->mailbox.state != MAILBOX_STATE_EMPTY) { dlog_error("Mailbox busy for VM ID %#x.\n", receiver_id); ret = ffa_error(FFA_DENIED); goto out; } receiver->mailbox.state = MAILBOX_STATE_OTHER_WORLD_OWNED; ret = (struct ffa_value){.func = FFA_SUCCESS_32}; out: vm_unlock(&receiver_locked); return ret; } /** * Enables or disables a given interrupt ID for the calling vCPU. * * Returns 0 on success, or -1 if the intid is invalid. */ int64_t api_interrupt_enable(uint32_t intid, bool enable, enum interrupt_type type, struct vcpu *current) { struct vcpu_locked current_locked; struct interrupts *interrupts = ¤t->interrupts; if (intid >= HF_NUM_INTIDS) { return -1; } current_locked = vcpu_lock(current); if (enable) { /* * If it is pending and was not enabled before, increment the * count. */ if (vcpu_is_virt_interrupt_pending(interrupts, intid) && !vcpu_is_virt_interrupt_enabled(interrupts, intid)) { vcpu_interrupt_count_increment(current_locked, interrupts, intid); } vcpu_virt_interrupt_set_enabled(interrupts, intid); vcpu_virt_interrupt_set_type(interrupts, intid, type); } else { /* * If it is pending and was enabled before, decrement the count. */ if (vcpu_is_virt_interrupt_pending(interrupts, intid) && vcpu_is_virt_interrupt_enabled(interrupts, intid)) { vcpu_interrupt_count_decrement(current_locked, interrupts, intid); } vcpu_virt_interrupt_clear_enabled(interrupts, intid); vcpu_virt_interrupt_set_type(interrupts, intid, INTERRUPT_TYPE_IRQ); } vcpu_unlock(¤t_locked); return 0; } static void api_interrupt_clear_decrement(struct vcpu_locked locked_vcpu, struct interrupts *interrupts, uint32_t intid) { vcpu_virt_interrupt_clear_pending(interrupts, intid); vcpu_interrupt_count_decrement(locked_vcpu, interrupts, intid); } /** * Returns the ID of the next pending interrupt for the calling vCPU, and * acknowledges it (i.e. marks it as no longer pending). Returns * HF_INVALID_INTID if there are no pending interrupts. */ uint32_t api_interrupt_get(struct vcpu *current) { uint32_t i; uint32_t first_interrupt = HF_INVALID_INTID; struct vcpu_locked current_locked; struct interrupts *interrupts = ¤t->interrupts; /* * Find the first enabled and pending interrupt ID, return it, and * deactivate it. */ current_locked = vcpu_lock(current); for (i = 0; i < HF_NUM_INTIDS / INTERRUPT_REGISTER_BITS; ++i) { uint32_t enabled_and_pending = interrupts->interrupt_enabled.bitmap[i] & interrupts->interrupt_pending.bitmap[i]; if (enabled_and_pending != 0) { uint8_t bit_index = ctz(enabled_and_pending); first_interrupt = i * INTERRUPT_REGISTER_BITS + bit_index; /* * Mark it as no longer pending and decrement the count. */ api_interrupt_clear_decrement( current_locked, interrupts, first_interrupt); break; } } vcpu_unlock(¤t_locked); return first_interrupt; } /** * Returns whether the current vCPU is allowed to inject an interrupt into the * given VM and vCPU. */ static inline bool is_injection_allowed(uint32_t target_vm_id, struct vcpu *current) { uint32_t current_vm_id = current->vm->id; /* * The primary VM is allowed to inject interrupts into any VM. Secondary * VMs are only allowed to inject interrupts into their own vCPUs. */ return current_vm_id == HF_PRIMARY_VM_ID || current_vm_id == target_vm_id; } /** * Injects a virtual interrupt of the given ID into the given target vCPU. * This doesn't cause the vCPU to actually be run immediately; it will be taken * when the vCPU is next run, which is up to the scheduler. * * Returns: * - -1 on failure because the target VM or vCPU doesn't exist, the interrupt * ID is invalid, or the current VM is not allowed to inject interrupts to * the target VM. * - 0 on success if no further action is needed. * - 1 if it was called by the primary VM and the primary VM now needs to wake * up or kick the target vCPU. */ int64_t api_interrupt_inject(ffa_id_t target_vm_id, ffa_vcpu_index_t target_vcpu_idx, uint32_t intid, struct vcpu *current, struct vcpu **next) { struct vcpu *target_vcpu; struct vm *target_vm = vm_find(target_vm_id); struct vcpu_locked current_locked; struct vcpu_locked target_locked; struct two_vcpu_locked vcpus_locked; int64_t ret; if (intid >= HF_NUM_INTIDS) { return -1; } if (target_vm == NULL) { return -1; } if (target_vcpu_idx >= target_vm->vcpu_count) { /* The requested vCPU must exist. */ return -1; } if (!is_injection_allowed(target_vm_id, current)) { return -1; } target_vcpu = vm_get_vcpu(target_vm, target_vcpu_idx); /* A VM could inject an interrupt for itself. */ if (target_vcpu != current) { /* Lock both vCPUs at once to avoid deadlock. */ vcpus_locked = vcpu_lock_both(current, target_vcpu); current_locked = vcpus_locked.vcpu1; target_locked = vcpus_locked.vcpu2; } else { current_locked = vcpu_lock(current); target_locked = current_locked; } dlog_verbose( "Injecting interrupt %u for VM %#x vCPU %u from VM %#x vCPU " "%u\n", intid, target_vm_id, target_vcpu_idx, current->vm->id, vcpu_index(current)); ret = api_interrupt_inject_locked(target_locked, intid, current_locked, next); if (target_vcpu != current) { vcpu_unlock(&target_locked); } vcpu_unlock(¤t_locked); return ret; } /** Returns the version of the implemented FF-A specification. */ struct ffa_value api_ffa_version(struct vcpu *current, uint32_t requested_version) { struct vm_locked current_vm_locked; /* * Ensure that both major and minor revision representation occupies at * most 15 bits. */ static_assert(0x8000 > FFA_VERSION_MAJOR, "Major revision representation takes more than 15 bits."); static_assert(0x10000 > FFA_VERSION_MINOR, "Minor revision representation takes more than 16 bits."); if (requested_version & FFA_VERSION_RESERVED_BIT) { /* Invalid encoding, return an error. */ return (struct ffa_value){.func = (uint32_t)FFA_NOT_SUPPORTED}; } if ((requested_version >> FFA_VERSION_MAJOR_OFFSET) != FFA_VERSION_MAJOR || requested_version > FFA_VERSION_COMPILED) { dlog_verbose("Version %x incompatible with %x\n", requested_version, FFA_VERSION_COMPILED); return (struct ffa_value){.func = (uint32_t)FFA_NOT_SUPPORTED}; } current_vm_locked = vm_lock(current->vm); current_vm_locked.vm->ffa_version = requested_version; vm_unlock(¤t_vm_locked); return ((struct ffa_value){.func = FFA_VERSION_COMPILED}); } /** * Helper for success return of FFA_FEATURES, for when it is used to query * an interrupt ID. */ struct ffa_value api_ffa_feature_success(uint32_t arg2) { return (struct ffa_value){ .func = FFA_SUCCESS_32, .arg1 = 0U, .arg2 = arg2}; } /** * Discovery function returning information about the implementation of optional * FF-A interfaces. */ struct ffa_value api_ffa_features(uint32_t feature_function_id, uint32_t input_property, struct vcpu *current) { const uint32_t ffa_version = current->vm->ffa_version; const bool el0_partition = current->vm->el0_partition; /* * According to table 13.8 of FF-A v1.1 Beta 0 spec, bits [30:8] MBZ * if using a feature ID. */ if ((feature_function_id & FFA_FEATURES_FUNC_ID_MASK) == 0U && (feature_function_id & ~FFA_FEATURES_FEATURE_ID_MASK) != 0U) { return ffa_error(FFA_NOT_SUPPORTED); } if (feature_function_id != FFA_MEM_RETRIEVE_REQ_32 && input_property != 0U) { dlog_verbose( "input_property must be zero.\ninput_property = %u.\n", input_property); return ffa_error(FFA_INVALID_PARAMETERS); } switch (feature_function_id) { /* Check support of the given Function ID. */ case FFA_ERROR_32: case FFA_SUCCESS_32: case FFA_INTERRUPT_32: case FFA_VERSION_32: case FFA_FEATURES_32: case FFA_RX_RELEASE_32: case FFA_RXTX_UNMAP_32: case FFA_PARTITION_INFO_GET_32: case FFA_ID_GET_32: case FFA_MSG_WAIT_32: case FFA_RUN_32: case FFA_MEM_DONATE_32: case FFA_MEM_LEND_32: case FFA_MEM_SHARE_32: case FFA_MEM_RETRIEVE_RESP_32: case FFA_MEM_RELINQUISH_32: case FFA_MEM_RECLAIM_32: case FFA_MEM_FRAG_RX_32: case FFA_MEM_FRAG_TX_32: case FFA_MSG_SEND_DIRECT_RESP_64: case FFA_MSG_SEND_DIRECT_RESP_32: case FFA_MSG_SEND_DIRECT_REQ_64: case FFA_MSG_SEND_DIRECT_REQ_32: #if (MAKE_FFA_VERSION(1, 1) <= FFA_VERSION_COMPILED) /* FF-A v1.1 features. */ case FFA_SPM_ID_GET_32: case FFA_NOTIFICATION_BITMAP_CREATE_32: case FFA_NOTIFICATION_BITMAP_DESTROY_32: case FFA_NOTIFICATION_BIND_32: case FFA_NOTIFICATION_UNBIND_32: case FFA_NOTIFICATION_SET_32: case FFA_NOTIFICATION_GET_32: case FFA_NOTIFICATION_INFO_GET_64: case FFA_MEM_PERM_GET_32: case FFA_MEM_PERM_SET_32: case FFA_MEM_PERM_GET_64: case FFA_MEM_PERM_SET_64: case FFA_MSG_SEND2_32: #endif #if (MAKE_FFA_VERSION(1, 2) <= FFA_VERSION_COMPILED) /* FF-A v1.2 features. */ case FFA_CONSOLE_LOG_32: case FFA_CONSOLE_LOG_64: case FFA_PARTITION_INFO_GET_REGS_64: case FFA_MSG_SEND_DIRECT_REQ2_64: case FFA_MSG_SEND_DIRECT_RESP2_64: #endif return (struct ffa_value){.func = FFA_SUCCESS_32}; case FFA_RXTX_MAP_64: { uint32_t arg2 = 0; struct ffa_features_rxtx_map_params params = { .min_buf_size = FFA_RXTX_MAP_MIN_BUF_4K, .mbz = 0, .max_buf_size = (ffa_version >= MAKE_FFA_VERSION(1, 2)) ? FFA_RXTX_MAP_MAX_BUF_PAGE_COUNT : 0, }; memcpy_s(&arg2, sizeof(arg2), ¶ms, sizeof(params)); return (struct ffa_value){ .func = FFA_SUCCESS_32, .arg2 = arg2, }; } case FFA_MEM_RETRIEVE_REQ_32: if ((input_property & FFA_FEATURES_MEM_RETRIEVE_REQ_MBZ_MASK) != 0U) { dlog_verbose( "Bits[31:2] and Bit[0] of input_property must " "be zero.\ninput_property = %u.\n", input_property); return ffa_error(FFA_INVALID_PARAMETERS); } if (ffa_version >= MAKE_FFA_VERSION(1, 1)) { if ((input_property & FFA_FEATURES_MEM_RETRIEVE_REQ_NS_SUPPORT) == 0U) { dlog_verbose("NS bit support must be 1.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } } return api_ffa_feature_success( FFA_FEATURES_MEM_RETRIEVE_REQ_BUFFER_SUPPORT | (input_property & FFA_FEATURES_MEM_RETRIEVE_REQ_NS_SUPPORT) | FFA_FEATURES_MEM_RETRIEVE_REQ_HYPERVISOR_SUPPORT); #if (MAKE_FFA_VERSION(1, 1) <= FFA_VERSION_COMPILED) /* Check support of a feature provided respective feature ID. */ /* * For NPI and MEI, report the IDs as supported only to partitions at * the virtual FF-A instances. */ case FFA_FEATURE_NPI: if (el0_partition) { return ffa_error(FFA_NOT_SUPPORTED); } if (!vm_id_is_current_world(current->vm->id)) { return ffa_error(FFA_NOT_SUPPORTED); } return api_ffa_feature_success(HF_NOTIFICATION_PENDING_INTID); case FFA_FEATURE_MEI: if (!vm_id_is_current_world(current->vm->id)) { return ffa_error(FFA_NOT_SUPPORTED); } return api_ffa_feature_success(HF_MANAGED_EXIT_INTID); case FFA_FEATURE_SRI: if (!ffa_is_vm_id(current->vm->id)) { return ffa_error(FFA_NOT_SUPPORTED); } return api_ffa_feature_success(HF_SCHEDULE_RECEIVER_INTID); #endif /* Platform specific feature support. */ default: return arch_ffa_features(feature_function_id); } } /** * FF-A specification states that x2/w2 Must Be Zero for FFA_MSG_SEND_DIRECT_REQ * and FFA_MSG_SEND_DIRECT_RESP interfaces when used for partition messages. See * FF-A v1.2 Table 16.6: FFA_MSG_SEND_DIRECT_REQ function syntax. */ static inline bool api_ffa_dir_msg_is_arg2_zero(struct ffa_value args) { return args.arg2 == 0U; } /** * Limits size of arguments in ffa_value structure to 32-bit. */ static struct ffa_value api_ffa_value_copy32(struct ffa_value args) { return (struct ffa_value){ .func = (uint32_t)args.func, .arg1 = (uint32_t)args.arg1, .arg2 = (uint32_t)0, .arg3 = (uint32_t)args.arg3, .arg4 = (uint32_t)args.arg4, .arg5 = (uint32_t)args.arg5, .arg6 = (uint32_t)args.arg6, .arg7 = (uint32_t)args.arg7, }; } /** * Helper to copy direct message payload, depending on SMC used, direct * messaging interface used, and expected registers size. */ static struct ffa_value api_ffa_dir_msg_value(struct ffa_value args) { if (args.func == FFA_MSG_SEND_DIRECT_REQ_32 || args.func == FFA_MSG_SEND_DIRECT_RESP_32) { return api_ffa_value_copy32(args); } if (args.func == FFA_MSG_SEND_DIRECT_REQ_64 || args.func == FFA_MSG_SEND_DIRECT_RESP_64) { args.arg2 = 0; } if (args.func == FFA_MSG_SEND_DIRECT_REQ2_64) { args.extended_val.valid = true; } if (args.func == FFA_MSG_SEND_DIRECT_RESP2_64) { args.arg2 = 0; args.arg3 = 0; } return args; } static bool api_ffa_dir_msg_req2_is_uuid_valid(struct vm *receiver_vm, struct ffa_value args) { struct ffa_uuid target_uuid; uint16_t i; ffa_uuid_unpack_from_uint64(args.arg2, args.arg3, &target_uuid); /* Allow for use of Nil UUID. */ if (ffa_uuid_is_null(&target_uuid)) { return true; } for (i = 0; i < PARTITION_MAX_UUIDS; i++) { if (ffa_uuid_is_null(&receiver_vm->uuids[i])) { break; } if (ffa_uuid_equal(&target_uuid, &receiver_vm->uuids[i])) { return true; } } return false; } /** * Send an FF-A direct message request. * This handler covers both FFA_MSG_SEND_DIRECT_REQ_32/64 * and FFA_MSG_SEND_DIRECT_REQ2_64 (introduced in FF-A v1.2) with function-based * checks to accomodate for the difference between the ABIs. * * FFA_MSG_SEND_DIRECT_REQ2_64 works mostly the same as * FFA_MSG_SEND_DIRECT_REQ_32/64, but adds the ability to send a direct message * request to a specified UUID within a partition and the usage of an extended * range of registers (x4-x17, instead of x4-x7) to be used as part of the * message payload. */ struct ffa_value api_ffa_msg_send_direct_req(ffa_id_t sender_vm_id, ffa_id_t receiver_vm_id, struct ffa_value args, struct vcpu *current, struct vcpu **next) { struct ffa_value ret; struct vm *receiver_vm; struct vm_locked receiver_locked; struct vcpu *receiver_vcpu; struct vcpu_locked current_locked; struct vcpu_locked receiver_vcpu_locked; struct two_vcpu_locked vcpus_locked; enum vcpu_state next_state = VCPU_STATE_RUNNING; if ((args.func == FFA_MSG_SEND_DIRECT_REQ_32 || args.func == FFA_MSG_SEND_DIRECT_REQ_64) && !api_ffa_dir_msg_is_arg2_zero(args)) { return ffa_error(FFA_INVALID_PARAMETERS); } if (!plat_ffa_is_direct_request_valid(current, sender_vm_id, receiver_vm_id)) { dlog_verbose("Invalid direct message request.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } if (plat_ffa_direct_request_forward(receiver_vm_id, args, &ret)) { return ret; } ret = (struct ffa_value){.func = FFA_INTERRUPT_32}; receiver_vm = vm_find(receiver_vm_id); if (receiver_vm == NULL) { dlog_verbose("Invalid Receiver!\n"); return ffa_error(FFA_INVALID_PARAMETERS); } if (args.func == FFA_MSG_SEND_DIRECT_REQ2_64 && !api_ffa_dir_msg_req2_is_uuid_valid(receiver_vm, args)) { dlog_verbose("UUID unrecognized for this VM\n"); return ffa_error(FFA_INVALID_PARAMETERS); } /* * Check if sender supports sending direct message req, and if * receiver supports receipt of direct message requests. */ if (!plat_ffa_is_direct_request_supported(current->vm, receiver_vm, args.func)) { return ffa_error(FFA_DENIED); } /* * Per FF-A EAC spec section 4.4.1 the firmware framework supports * UP (migratable) or MP partitions with a number of vCPUs matching the * number of PEs in the system. It further states that MP partitions * accepting direct request messages cannot migrate. */ receiver_vcpu = api_ffa_get_vm_vcpu(receiver_vm, current); if (receiver_vcpu == NULL) { dlog_verbose("Invalid vCPU!\n"); return ffa_error(FFA_INVALID_PARAMETERS); } /* * If VM must be locked, it must be done before any of its vCPUs are * locked. */ receiver_locked = vm_lock(receiver_vm); /* Lock both vCPUs at once to avoid deadlock. */ vcpus_locked = vcpu_lock_both(current, receiver_vcpu); current_locked = vcpus_locked.vcpu1; receiver_vcpu_locked = vcpus_locked.vcpu2; /* * If destination vCPU is executing or already received an * FFA_MSG_SEND_DIRECT_REQ then return to caller hinting recipient is * busy. There is a brief period of time where the vCPU state has * changed but regs_available is still false thus consider this case as * the vCPU not yet ready to receive a direct message request. */ if (is_ffa_direct_msg_request_ongoing(receiver_vcpu_locked) || receiver_vcpu->state == VCPU_STATE_RUNNING || !receiver_vcpu->regs_available) { dlog_verbose("Receiver is busy with another request.\n"); ret = ffa_error(FFA_BUSY); goto out; } if (!plat_ffa_check_runtime_state_transition( current_locked, sender_vm_id, HF_INVALID_VM_ID, receiver_vcpu_locked, args.func, &next_state)) { ret = ffa_error(FFA_DENIED); goto out; } if (atomic_load_explicit(&receiver_vcpu->vm->aborting, memory_order_relaxed)) { if (receiver_vcpu->state != VCPU_STATE_ABORTED) { dlog_verbose( "Receiver VM %#x aborted, cannot run vCPU %u\n", receiver_vcpu->vm->id, vcpu_index(receiver_vcpu)); receiver_vcpu->state = VCPU_STATE_ABORTED; } ret = ffa_error(FFA_ABORTED); goto out; } switch (receiver_vcpu->state) { case VCPU_STATE_OFF: case VCPU_STATE_RUNNING: case VCPU_STATE_ABORTED: case VCPU_STATE_BLOCKED_INTERRUPT: case VCPU_STATE_BLOCKED: case VCPU_STATE_PREEMPTED: dlog_verbose("Receiver's vCPU can't receive request (%u)!\n", vcpu_index(receiver_vcpu)); ret = ffa_error(FFA_BUSY); goto out; case VCPU_STATE_WAITING: /* * We expect target vCPU to be in WAITING state after either * having called ffa_msg_wait or sent a direct message response. */ break; } /* Inject timer interrupt if any pending */ if (arch_timer_pending(&receiver_vcpu->regs)) { api_interrupt_inject_locked(receiver_vcpu_locked, HF_VIRTUAL_TIMER_INTID, current_locked, NULL); arch_timer_mask(&receiver_vcpu->regs); } /* The receiver vCPU runs upon direct message invocation */ receiver_vcpu->cpu = current->cpu; receiver_vcpu->state = VCPU_STATE_RUNNING; receiver_vcpu->regs_available = false; receiver_vcpu->direct_request_origin.is_ffa_req2 = (args.func == FFA_MSG_SEND_DIRECT_REQ2_64); receiver_vcpu->direct_request_origin.vm_id = sender_vm_id; arch_regs_set_retval(&receiver_vcpu->regs, api_ffa_dir_msg_value(args)); assert(!vm_id_is_current_world(current->vm->id) || next_state == VCPU_STATE_BLOCKED); current->state = VCPU_STATE_BLOCKED; plat_ffa_wind_call_chain_ffa_direct_req( current_locked, receiver_vcpu_locked, sender_vm_id); /* Switch to receiver vCPU targeted to by direct msg request */ *next = receiver_vcpu; if (!receiver_locked.vm->el0_partition) { /* * If the scheduler in the system is giving CPU cycles to the * receiver, due to pending notifications, inject the NPI * interrupt. Following call assumes that '*next' has been set * to receiver_vcpu. */ plat_ffa_inject_notification_pending_interrupt( receiver_vcpu_locked, current_locked, receiver_locked); } /* * Since this flow will lead to a VM switch, the return value will not * be applied to current vCPU. */ out: vcpu_unlock(&receiver_vcpu_locked); vm_unlock(&receiver_locked); vcpu_unlock(¤t_locked); return ret; } /** * Resume the target vCPU after the current vCPU sent a direct response. * Current vCPU moves to waiting state. */ void api_ffa_resume_direct_resp_target(struct vcpu_locked current_locked, struct vcpu **next, ffa_id_t receiver_vm_id, struct ffa_value to_ret, bool is_nwd_call_chain) { if (plat_ffa_is_spmd_lp_id(receiver_vm_id) || !vm_id_is_current_world(receiver_vm_id)) { *next = api_switch_to_other_world(current_locked, to_ret, VCPU_STATE_WAITING); /* End of NWd scheduled call chain. */ assert(!is_nwd_call_chain || (current_locked.vcpu->call_chain.prev_node == NULL)); } else if (receiver_vm_id == HF_PRIMARY_VM_ID) { *next = api_switch_to_primary(current_locked, to_ret, VCPU_STATE_WAITING); } else if (vm_id_is_current_world(receiver_vm_id)) { /* * It is expected the receiver_vm_id to be from an SP, otherwise * 'plat_ffa_is_direct_response_valid' should have * made function return error before getting to this point. */ *next = api_switch_to_vm(current_locked, to_ret, VCPU_STATE_WAITING, receiver_vm_id); } else { panic("Invalid direct message response invocation"); } } /** * Send an FF-A direct message response. * This handler covers both FFA_MSG_SEND_DIRECT_RESP_32/64 * and FFA_MSG_SEND_DIRECT_RESP2_64 (introduced in FF-A v1.2) with * function-based checks to accomodate for the difference between the ABIs. * * FFA_MSG_SEND_DIRECT_RESP2_64 is used to respond to requests sent via * FFA_MSG_SEND_DIRECT_REQ2_64 and adds the usage of an extended range * of registers (x4-x17, instead of x4-x7) to be used as part of the * message payload. */ struct ffa_value api_ffa_msg_send_direct_resp(ffa_id_t sender_vm_id, ffa_id_t receiver_vm_id, struct ffa_value args, struct vcpu *current, struct vcpu **next) { struct vcpu_locked current_locked; struct vcpu_locked next_locked = (struct vcpu_locked){ .vcpu = NULL, }; enum vcpu_state next_state = VCPU_STATE_RUNNING; struct ffa_value ret = (struct ffa_value){.func = FFA_INTERRUPT_32}; struct ffa_value signal_interrupt = (struct ffa_value){.func = FFA_INTERRUPT_32}; struct ffa_value to_ret = api_ffa_dir_msg_value(args); struct two_vcpu_locked vcpus_locked; bool received_req2; /* * If using FFA_MSG_SEND_DIRECT_RESP, the caller's * - x2 MBZ for partition messages * - x8-x17 SBZ if caller's FF-A version >= FF-A v1.2 */ if (args.func != FFA_MSG_SEND_DIRECT_RESP2_64) { if (!api_ffa_dir_msg_is_arg2_zero(args)) { return ffa_error(FFA_INVALID_PARAMETERS); } if (current->vm->ffa_version >= MAKE_FFA_VERSION(1, 2) && !api_extended_args_are_zero(&args)) { return ffa_error(FFA_INVALID_PARAMETERS); } } if (!plat_ffa_is_direct_response_valid(current, sender_vm_id, receiver_vm_id)) { dlog_verbose("Invalid direct response call.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } current_locked = vcpu_lock(current); if (!plat_ffa_check_runtime_state_transition( current_locked, sender_vm_id, receiver_vm_id, next_locked, args.func, &next_state)) { ret = ffa_error(FFA_DENIED); goto out; } assert(!vm_id_is_current_world(current->vm->id) || next_state == VCPU_STATE_WAITING); /* * Ensure the terminating FFA_MSG_SEND_DIRECT_REQ had a * defined originator. */ if (!is_ffa_direct_msg_request_ongoing(current_locked)) { /* * Sending direct response but direct request origin * vCPU is not set. */ ret = ffa_error(FFA_DENIED); goto out; } received_req2 = current->direct_request_origin.is_ffa_req2; if (args.func != FFA_MSG_SEND_DIRECT_RESP2_64 && received_req2) { dlog_verbose( "%s: FFA_MSG_SEND_DIRECT_RESP must be used with " "FFA_MSG_SEND_DIRECT_REQ.\n", __func__); ret = ffa_error(FFA_DENIED); goto out; } else if (args.func == FFA_MSG_SEND_DIRECT_RESP2_64 && !received_req2) { dlog_verbose( "%s: FFA_MSG_SEND_DIRECT_RESP2 must be used with " "FFA_MSG_SEND_DIRECT_REQ2.\n", __func__); ret = ffa_error(FFA_DENIED); goto out; } if (api_ffa_is_managed_exit_ongoing(current_locked)) { /* * Per FF-A v1.1 EAC0 section 8.3.1.2.1 rule 6, SPMC can signal * a secure interrupt to a SP that is performing managed exit. * We have taken a implementation defined choice to not allow * Managed exit while a SP is processing a secure interrupt. */ CHECK(!current->processing_secure_interrupt); plat_interrupts_set_priority_mask(current->priority_mask); /* * A SP may be signaled a managed exit but actually not trap * the virtual interrupt, probably because it has virtual * interrupts masked, and emit direct resp. In this case the * managed exit operation is considered completed and it would * also need to clear the pending managed exit flag for the SP * vCPU. */ current->processing_managed_exit = false; struct interrupts *interrupts = ¤t->interrupts; if (vcpu_is_virt_interrupt_pending(interrupts, HF_MANAGED_EXIT_INTID)) { api_interrupt_clear_decrement(current_locked, interrupts, HF_MANAGED_EXIT_INTID); } } if (plat_ffa_intercept_direct_response(current_locked, next, to_ret, &signal_interrupt)) { ret = signal_interrupt; goto out; } /* Clear direct request origin vm_id and request type for the caller. */ current->direct_request_origin.is_ffa_req2 = false; current->direct_request_origin.vm_id = HF_INVALID_VM_ID; api_ffa_resume_direct_resp_target(current_locked, next, receiver_vm_id, to_ret, false); /* * Unlock current vCPU to allow it to be locked together with next * vcpu. */ vcpu_unlock(¤t_locked); /* Lock both vCPUs at once to avoid deadlock. */ vcpus_locked = vcpu_lock_both(current, *next); current_locked = vcpus_locked.vcpu1; next_locked = vcpus_locked.vcpu2; plat_ffa_unwind_call_chain_ffa_direct_resp(current_locked, next_locked); vcpu_unlock(&next_locked); out: vcpu_unlock(¤t_locked); return ret; } static bool api_memory_region_check_flags( struct ffa_memory_region *memory_region, uint32_t share_func) { switch (share_func) { case FFA_MEM_SHARE_32: if ((memory_region->flags & FFA_MEMORY_REGION_FLAG_CLEAR) != 0U) { return false; } /* Intentional fall-through */ case FFA_MEM_LEND_32: case FFA_MEM_DONATE_32: { /* Bits 31:2 Must Be Zero. */ ffa_memory_receiver_flags_t to_mask = ~(FFA_MEMORY_REGION_FLAG_CLEAR | FFA_MEMORY_REGION_FLAG_TIME_SLICE); if ((memory_region->flags & to_mask) != 0U) { return false; } break; } default: panic("Check for mem send calls only.\n"); } /* Last check reserved values are 0 */ return true; } /* * Convert memory transaction descriptor from FF-A v1.0 to FF-A v1.1 EAC0. */ static void api_ffa_memory_region_v1_1_from_v1_0( struct ffa_memory_region_v1_0 *memory_region_v1_0, struct ffa_memory_region *memory_region_v1_1) { memory_region_v1_1->sender = memory_region_v1_0->sender; memory_region_v1_1->handle = memory_region_v1_0->handle; memory_region_v1_1->attributes = ffa_memory_attributes_extend(memory_region_v1_0->attributes); memory_region_v1_1->flags = memory_region_v1_0->flags; memory_region_v1_1->tag = memory_region_v1_0->tag; memory_region_v1_1->memory_access_desc_size = sizeof(struct ffa_memory_access_v1_0); memory_region_v1_1->receiver_count = memory_region_v1_0->receiver_count; memory_region_v1_1->receivers_offset = sizeof(struct ffa_memory_region); /* Zero reserved fields. */ for (uint32_t i = 0; i < 3U; i++) { memory_region_v1_1->reserved[i] = 0U; } } /** * Updates a v1.0 transaction descriptor to v1.1. This gives us the * memory_access_desc_size field we need for forwards compatability. * Copy the receivers and composite descriptors to the new struct. * We also check the fields in the v1.0 transaction descriptor and return: * - FFA_ERROR FFA_INVALID_PARAMETERS: If any of the fields are not valid * values, eg the reserved fields are not 0, receiver_count is too large or * composite offsets are not 0 for retrieve requests or in bounds for send * requests. * - FFA ERROR FFA_NOT_SUPPORTED: If an invalid ffa_version is supplied to the * function. Or the fragment length is more than a single page. * - FFA_ERROR FFA_NO_MEMORY: If we do not have enough memory for a scratch * memory transaction descriptor. * - FFA_SUCCESS: If a successful update has occured. */ static struct ffa_value api_ffa_memory_transaction_descriptor_v1_1_from_v1_0( void *allocated, uint32_t *fragment_length, uint32_t *total_length, uint32_t ffa_version, bool send_transaction) { struct ffa_memory_region_v1_0 *memory_region_v1_0; struct ffa_memory_region *memory_region_v1_1 = NULL; struct ffa_composite_memory_region *composite_v1_0; struct ffa_composite_memory_region *composite_v1_1; size_t receivers_length; size_t space_left; size_t receivers_end; size_t composite_offset_v1_1; size_t composite_offset_v1_0; size_t fragment_constituents_size; size_t fragment_length_v1_1; assert(fragment_length != NULL); assert(total_length != NULL); if (ffa_version >= MAKE_FFA_VERSION(1, 1)) { return (struct ffa_value){.func = FFA_SUCCESS_32}; } if (ffa_version != MAKE_FFA_VERSION(1, 0)) { dlog_verbose("%s: Unsupported FF-A version %x\n", __func__, ffa_version); return ffa_error(FFA_NOT_SUPPORTED); } dlog_verbose( "Updating memory transaction descriptor " " from v1.0 to v1.1.\n"); memory_region_v1_0 = (struct ffa_memory_region_v1_0 *)allocated; receivers_length = sizeof(struct ffa_memory_access_v1_0) * memory_region_v1_0->receiver_count; receivers_end = sizeof(struct ffa_memory_region) + receivers_length; /* * Check the specified composite offset of v1.0 descriptor, and that all * receivers were configured with the same offset. */ composite_offset_v1_0 = memory_region_v1_0->receivers[0].composite_memory_region_offset; /* Determine the composite offset for v1.1 descriptor. */ if (send_transaction) { fragment_constituents_size = *fragment_length - composite_offset_v1_0 - sizeof(struct ffa_composite_memory_region); fragment_length_v1_1 = receivers_end + sizeof(struct ffa_composite_memory_region) + fragment_constituents_size; composite_offset_v1_1 = receivers_end; } else { fragment_constituents_size = 0; fragment_length_v1_1 = receivers_end; composite_offset_v1_1 = 0; } /* * Currently only support the simpler cases: memory transaction * in a single fragment that fits in a MM_PPOOL_ENTRY_SIZE. * TODO: allocate the entries needed for this fragment_length_v1_1. * - Check corner when v1.1 descriptor converted size surpasses * the size of the entry. */ if (fragment_length_v1_1 > MM_PPOOL_ENTRY_SIZE) { dlog_verbose( "Translation of FF-A v1.0 descriptors for over %u is " "unsupported.", MM_PPOOL_ENTRY_SIZE); return ffa_error(FFA_NOT_SUPPORTED); } space_left = fragment_length_v1_1; /* * Allocate a page of memory to construct the v1.1 memory descriptor. * Earlier we checked that the fragment_length_v1_1 would not be larger * than a page. */ memory_region_v1_1 = (struct ffa_memory_region *)mpool_alloc(&api_page_pool); if (memory_region_v1_1 == NULL) { return ffa_error(FFA_NO_MEMORY); } /* Translate header from v1.0 to v1.1. */ api_ffa_memory_region_v1_1_from_v1_0(memory_region_v1_0, memory_region_v1_1); space_left -= sizeof(struct ffa_memory_region); /* Copy memory access information. */ memcpy_s((uint8_t *)memory_region_v1_1 + memory_region_v1_1->receivers_offset, space_left, memory_region_v1_0->receivers, receivers_length); /* Initialize the memory access descriptors with composite offset. */ for (uint32_t i = 0; i < memory_region_v1_1->receiver_count; i++) { struct ffa_memory_access *receiver = ffa_memory_region_get_receiver(memory_region_v1_1, i); assert(receiver != NULL); receiver->composite_memory_region_offset = composite_offset_v1_1; } space_left -= receivers_length; /* Composite memory descriptors to copy. */ if (send_transaction) { /* Init v1.1 composite. */ composite_v1_1 = (struct ffa_composite_memory_region *)((uint8_t *)memory_region_v1_1 + composite_offset_v1_1); composite_v1_0 = ffa_memory_region_get_composite_v1_0( memory_region_v1_0, 0); composite_v1_1->constituent_count = composite_v1_0->constituent_count; composite_v1_1->page_count = composite_v1_0->page_count; space_left -= sizeof(struct ffa_composite_memory_region); /* Initialize v1.1 constituents. */ memcpy_s(composite_v1_1->constituents, space_left, composite_v1_0->constituents, fragment_constituents_size); space_left -= fragment_constituents_size; } assert(space_left == 0U); /* * Remove the v1.0 fragment size, and resultant size of v1.1 fragment. */ *total_length = *total_length - *fragment_length + fragment_length_v1_1; *fragment_length = fragment_length_v1_1; /* * After successfully updating to v1.1 copy the descriptor to the * internal buffer given as a parameter (used to prevent TOCTOU attacks) * and free the scratch memory used to construct it. */ memcpy_s(allocated, MM_PPOOL_ENTRY_SIZE, memory_region_v1_1, *fragment_length); mpool_free(&api_page_pool, memory_region_v1_1); return (struct ffa_value){.func = FFA_SUCCESS_32}; } struct ffa_value api_ffa_mem_send(uint32_t share_func, uint32_t length, uint32_t fragment_length, ipaddr_t address, uint32_t page_count, struct vcpu *current) { struct vm *from = current->vm; struct vm *to; const void *from_msg; void *allocated_entry; struct ffa_memory_region *memory_region = NULL; struct ffa_value ret; bool targets_other_world = false; uint32_t ffa_version; if (ipa_addr(address) != 0 || page_count != 0) { /* * Hafnium only supports passing the descriptor in the TX * mailbox. */ return ffa_error(FFA_INVALID_PARAMETERS); } if (fragment_length > length) { dlog_verbose( "Fragment length %d greater than total length %d.\n", fragment_length, length); return ffa_error(FFA_INVALID_PARAMETERS); } if (fragment_length > HF_MAILBOX_SIZE || fragment_length > MM_PPOOL_ENTRY_SIZE) { return ffa_error(FFA_INVALID_PARAMETERS); } /* * Check that the sender has configured its send buffer. If the TX * mailbox at from_msg is configured (i.e. from_msg != NULL) then it can * be safely accessed after releasing the lock since the TX mailbox * address can only be configured once. */ sl_lock(&from->lock); from_msg = from->mailbox.send; ffa_version = from->ffa_version; sl_unlock(&from->lock); if (from_msg == NULL) { return ffa_error(FFA_INVALID_PARAMETERS); } /* * Copy the memory region descriptor to a fresh page from the memory * pool. This prevents the sender from changing it underneath us, and * also lets us keep it around in the share state table if needed. */ allocated_entry = mpool_alloc(&api_page_pool); if (allocated_entry == NULL) { dlog_verbose("Failed to allocate memory region copy.\n"); return ffa_error(FFA_NO_MEMORY); } memcpy_s(allocated_entry, MM_PPOOL_ENTRY_SIZE, from_msg, fragment_length); if (!ffa_memory_region_sanity_check(allocated_entry, ffa_version, fragment_length, true)) { ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } ret = api_ffa_memory_transaction_descriptor_v1_1_from_v1_0( allocated_entry, &fragment_length, &length, ffa_version, true); if (ret.func != FFA_SUCCESS_32) { goto out; } memory_region = allocated_entry; if (fragment_length < sizeof(struct ffa_memory_region) + memory_region->memory_access_desc_size) { dlog_verbose( "Initial fragment length %d smaller than header size " "%d.\n", fragment_length, sizeof(struct ffa_memory_region) + memory_region->memory_access_desc_size); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } if (!api_memory_region_check_flags(memory_region, share_func)) { dlog_verbose( "Memory region reserved arguments must be zero.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } if (memory_region->receiver_count == 0U) { dlog_verbose("Receiver count can't be 0.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } if (share_func == FFA_MEM_DONATE_32 && memory_region->receiver_count != 1U) { dlog_verbose( "FFA_MEM_DONATE only supports one recipient. " "Specified %u\n", memory_region->receiver_count); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* * Ensure that the receiver VM exists and isn't the same as the sender. * If there is a receiver from the other world, track it for later * forwarding if needed. */ for (uint32_t i = 0U; i < memory_region->receiver_count; i++) { struct ffa_memory_access *receiver = ffa_memory_region_get_receiver(memory_region, i); assert(receiver != NULL); ffa_id_t receiver_id = receiver->receiver_permissions.receiver; to = vm_find(receiver_id); if ((vm_id_is_current_world(receiver_id) && to == NULL) || to == from) { dlog_verbose("%s: invalid receiver.\n", __func__); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } if (!plat_ffa_is_memory_send_valid(receiver_id, share_func)) { ret = ffa_error(FFA_DENIED); goto out; } /* Capture if any of the receivers is from the other world. */ if (!targets_other_world) { targets_other_world = !vm_id_is_current_world(receiver_id); } } if (targets_other_world) { ret = plat_ffa_other_world_mem_send( from, share_func, &memory_region, length, fragment_length, &api_page_pool); } else { struct vm_locked from_locked = vm_lock(from); ret = ffa_memory_send(from_locked, memory_region, length, fragment_length, share_func, &api_page_pool); /* * ffa_memory_send takes ownership of the memory_region, so * make sure we don't free it. */ memory_region = NULL; vm_unlock(&from_locked); } out: if (memory_region != NULL) { mpool_free(&api_page_pool, memory_region); } return ret; } struct ffa_value api_ffa_mem_retrieve_req(uint32_t length, uint32_t fragment_length, ipaddr_t address, uint32_t page_count, struct vcpu *current) { struct vm *to = current->vm; struct vm_locked to_locked; const void *to_msg; void *retrieve_msg; struct ffa_memory_region *retrieve_request = NULL; uint32_t message_buffer_size; struct ffa_value ret; uint32_t ffa_version; if (ipa_addr(address) != 0 || page_count != 0) { /* * Hafnium only supports passing the descriptor in the TX * mailbox. */ return ffa_error(FFA_INVALID_PARAMETERS); } if (fragment_length != length) { dlog_verbose("Fragmentation not supported.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } retrieve_msg = cpu_get_buffer(current->cpu); message_buffer_size = cpu_get_buffer_size(current->cpu); if (length > HF_MAILBOX_SIZE || length > message_buffer_size) { dlog_verbose("Retrieve request too long.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } to_locked = vm_lock(to); to_msg = to->mailbox.send; ffa_version = to->ffa_version; if (to_msg == NULL) { dlog_verbose("TX buffer not setup.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* * Copy the retrieve request descriptor to an internal buffer, so that * the caller can't change it underneath us. */ memcpy_s(retrieve_msg, message_buffer_size, to_msg, length); if ((vm_is_mailbox_other_world_owned(to_locked) && !plat_ffa_acquire_receiver_rx(to_locked, &ret)) || vm_is_mailbox_busy(to_locked)) { /* * Can't retrieve memory information if the mailbox is * not available. */ dlog_verbose("%s: RX buffer not ready.\n", __func__); ret = ffa_error(FFA_BUSY); goto out; } if (!is_ffa_hypervisor_retrieve_request(retrieve_msg, to_locked)) { if (!ffa_memory_region_sanity_check(retrieve_msg, ffa_version, fragment_length, false)) { ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* * If required, transform the retrieve request to FF-A v1.1. */ ret = api_ffa_memory_transaction_descriptor_v1_1_from_v1_0( retrieve_msg, &fragment_length, &length, ffa_version, false); if (ret.func != FFA_SUCCESS_32) { goto out; } } retrieve_request = retrieve_msg; if (plat_ffa_memory_handle_allocated_by_current_world( retrieve_request->handle)) { ret = ffa_memory_retrieve(to_locked, retrieve_request, length, &api_page_pool); } else { dlog_error("Invalid FF-A memory handle.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); } out: vm_unlock(&to_locked); return ret; } struct ffa_value api_ffa_mem_relinquish(struct vcpu *current) { struct vm *from = current->vm; struct vm_locked from_locked; const void *from_msg; struct ffa_mem_relinquish *relinquish_request; uint32_t message_buffer_size; struct ffa_value ret; uint32_t length; from_locked = vm_lock(from); from_msg = from->mailbox.send; if (from_msg == NULL) { dlog_verbose("TX buffer not setup.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* * Calculate length from relinquish descriptor before copying. We will * check again later to make sure it hasn't changed. */ length = sizeof(struct ffa_mem_relinquish) + ((struct ffa_mem_relinquish *)from_msg)->endpoint_count * sizeof(ffa_id_t); /* * Copy the relinquish descriptor to an internal buffer, so that the * caller can't change it underneath us. */ relinquish_request = (struct ffa_mem_relinquish *)cpu_get_buffer(current->cpu); message_buffer_size = cpu_get_buffer_size(current->cpu); if (length > HF_MAILBOX_SIZE || length > message_buffer_size) { dlog_verbose("Relinquish message too long.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } memcpy_s(relinquish_request, message_buffer_size, from_msg, length); if (sizeof(struct ffa_mem_relinquish) + relinquish_request->endpoint_count * sizeof(ffa_id_t) != length) { dlog_verbose( "Endpoint count changed while copying to internal " "buffer.\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } ret = ffa_memory_relinquish(from_locked, relinquish_request, &api_page_pool); out: vm_unlock(&from_locked); return ret; } struct ffa_value api_ffa_mem_reclaim(ffa_memory_handle_t handle, ffa_memory_region_flags_t flags, struct vcpu *current) { struct vm *to = current->vm; struct ffa_value ret; if (plat_ffa_memory_handle_allocated_by_current_world(handle)) { struct vm_locked to_locked = vm_lock(to); ret = ffa_memory_reclaim(to_locked, handle, flags, &api_page_pool); vm_unlock(&to_locked); } else { ret = plat_ffa_other_world_mem_reclaim(to, handle, flags, &api_page_pool); } return ret; } struct ffa_value api_ffa_mem_frag_rx(ffa_memory_handle_t handle, uint32_t fragment_offset, ffa_id_t sender_vm_id, struct vcpu *current) { struct vm *to = current->vm; struct vm_locked to_locked; struct ffa_value ret; /* Sender ID MBZ at virtual instance. */ if (vm_id_is_current_world(to->id)) { if (sender_vm_id != 0) { dlog_verbose("%s: Invalid sender.\n", __func__); return ffa_error(FFA_INVALID_PARAMETERS); } } to_locked = vm_lock(to); if (vm_is_mailbox_busy(to_locked)) { /* * Can't retrieve memory information if the mailbox is not * available. */ dlog_verbose("%s: RX buffer not ready partition %x.\n", __func__, to_locked.vm->id); ret = ffa_error(FFA_BUSY); goto out; } ret = ffa_memory_retrieve_continue(to_locked, handle, fragment_offset, sender_vm_id, &api_page_pool); out: vm_unlock(&to_locked); return ret; } struct ffa_value api_ffa_mem_frag_tx(ffa_memory_handle_t handle, uint32_t fragment_length, ffa_id_t sender_vm_id, struct vcpu *current) { struct vm *from = current->vm; const void *from_msg; void *fragment_copy; struct ffa_value ret; /* Sender ID MBZ at virtual instance. */ if (vm_id_is_current_world(from->id) && sender_vm_id != 0) { dlog_verbose("Invalid sender."); return ffa_error(FFA_INVALID_PARAMETERS); } /* * Check that the sender has configured its send buffer. If the TX * mailbox at from_msg is configured (i.e. from_msg != NULL) then it can * be safely accessed after releasing the lock since the TX mailbox * address can only be configured once. */ sl_lock(&from->lock); from_msg = from->mailbox.send; sl_unlock(&from->lock); if (from_msg == NULL) { dlog_verbose("Mailbox from %x is not set.\n", from->id); return ffa_error(FFA_INVALID_PARAMETERS); } /* * Copy the fragment to a fresh page from the memory pool. This prevents * the sender from changing it underneath us, and also lets us keep it * around in the share state table if needed. */ if (fragment_length > HF_MAILBOX_SIZE || fragment_length > MM_PPOOL_ENTRY_SIZE) { dlog_verbose( "Fragment length %d larger than mailbox size %d.\n", fragment_length, HF_MAILBOX_SIZE); return ffa_error(FFA_INVALID_PARAMETERS); } if (fragment_length < sizeof(struct ffa_memory_region_constituent) || fragment_length % sizeof(struct ffa_memory_region_constituent) != 0) { dlog_verbose("Invalid fragment length %d.\n", fragment_length); return ffa_error(FFA_INVALID_PARAMETERS); } fragment_copy = mpool_alloc(&api_page_pool); if (fragment_copy == NULL) { dlog_verbose("Failed to allocate fragment copy.\n"); return ffa_error(FFA_NO_MEMORY); } memcpy_s(fragment_copy, MM_PPOOL_ENTRY_SIZE, from_msg, fragment_length); /* * Hafnium doesn't support fragmentation of memory retrieve requests * (because it doesn't support caller-specified mappings, so a request * will never be larger than a single page), so this must be part of a * memory send (i.e. donate, lend or share) request. * * We can tell from the handle whether the memory transaction is for the * other world or not. */ if (plat_ffa_memory_handle_allocated_by_current_world(handle)) { struct vm_locked from_locked = vm_lock(from); ret = ffa_memory_send_continue(from_locked, fragment_copy, fragment_length, handle, &api_page_pool); /* * `ffa_memory_send_continue` takes ownership of the * fragment_copy, so we don't need to free it here. */ vm_unlock(&from_locked); } else { ret = plat_ffa_other_world_mem_send_continue( from, fragment_copy, fragment_length, handle, &api_page_pool); } return ret; } /** * Register an entry point for a vCPU in warm boot cases. * DEN0077A FF-A v1.1 Beta0 section 18.3.2.1 FFA_SECONDARY_EP_REGISTER. */ struct ffa_value api_ffa_secondary_ep_register(ipaddr_t entry_point, struct vcpu *current) { struct vm_locked vm_locked; struct vcpu_locked current_locked; /* * Reject if interface is not supported at this FF-A instance * (DEN0077A FF-A v1.1 Beta0 Table 18.29) or the VM is UP. */ if (!plat_ffa_is_secondary_ep_register_supported() || current->vm->vcpu_count == 1) { return ffa_error(FFA_NOT_SUPPORTED); } /* * No further check is made on the address validity * (FF-A v1.1 Beta0 Table 18.29) as the VM boundaries are not known * from the VM or vCPU structure. * DEN0077A FF-A v1.1 Beta0 section 18.3.2.1.1: * For each SP [...] the Framework assumes that the same entry point * address is used for initializing any execution context during a * secondary cold boot. * If this function is invoked multiple times, then the entry point * address specified in the last valid invocation must be used by the * callee. */ current_locked = vcpu_lock(current); if (current->rt_model != RTM_SP_INIT) { dlog_error( "FFA_SECONDARY_EP_REGISTER can only be called while " "vCPU in run-time state for initialization.\n"); vcpu_unlock(¤t_locked); return ffa_error(FFA_DENIED); } vcpu_unlock(¤t_locked); vm_locked = vm_lock(current->vm); vm_locked.vm->secondary_ep = entry_point; vm_unlock(&vm_locked); return (struct ffa_value){.func = FFA_SUCCESS_32}; } struct ffa_value api_ffa_notification_bitmap_create(ffa_id_t vm_id, ffa_vcpu_count_t vcpu_count, struct vcpu *current) { const struct ffa_value ret = plat_ffa_is_notifications_bitmap_access_valid(current, vm_id); if (ffa_func_id(ret) != FFA_SUCCESS_32) { dlog_verbose( "FFA_NOTIFICATION_BITMAP_CREATE to be used by " "hypervisor for valid NWd VM IDs only (%x).\n", vm_id); return ret; } return plat_ffa_notifications_bitmap_create(vm_id, vcpu_count); } struct ffa_value api_ffa_notification_bitmap_destroy(ffa_id_t vm_id, struct vcpu *current) { const struct ffa_value ret = plat_ffa_is_notifications_bitmap_access_valid(current, vm_id); if (ffa_func_id(ret) != FFA_SUCCESS_32) { dlog_verbose( "FFA_NOTIFICATION_BITMAP_DESTROY to be used by " "hypervisor for valid NWd VM IDs only (%x).\n", vm_id); return ret; } return plat_ffa_notifications_bitmap_destroy(vm_id); } struct ffa_value api_ffa_notification_update_bindings( ffa_id_t sender_vm_id, ffa_id_t receiver_vm_id, uint32_t flags, ffa_notifications_bitmap_t notifications, bool is_bind, struct vcpu *current) { struct ffa_value ret = {.func = FFA_SUCCESS_32}; struct vm_locked receiver_locked; const bool is_per_vcpu = (flags & FFA_NOTIFICATION_FLAG_PER_VCPU) != 0U; const ffa_id_t id_to_update = is_bind ? sender_vm_id : HF_INVALID_VM_ID; const ffa_id_t id_to_validate = is_bind ? HF_INVALID_VM_ID : sender_vm_id; const uint32_t flags_mbz = is_bind ? ~FFA_NOTIFICATIONS_FLAG_PER_VCPU : ~0U; if ((flags_mbz & flags) != 0U) { return ffa_error(FFA_INVALID_PARAMETERS); } if (!plat_ffa_is_notifications_bind_valid(current, sender_vm_id, receiver_vm_id)) { dlog_verbose("Invalid use of notifications bind interface.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } if (plat_ffa_notifications_update_bindings_forward( receiver_vm_id, sender_vm_id, flags, notifications, is_bind, &ret)) { return ret; } if (notifications == 0U) { dlog_verbose("No notifications have been specified %x.\n", notifications); return ffa_error(FFA_INVALID_PARAMETERS); } /** * This check assumes receiver is the current VM, and has been enforced * by 'plat_ffa_is_notifications_bind_valid'. */ receiver_locked = plat_ffa_vm_find_locked(receiver_vm_id); if (receiver_locked.vm == NULL) { dlog_verbose("Receiver doesn't exist!\n"); return ffa_error(FFA_INVALID_PARAMETERS); } if (!vm_locked_are_notifications_enabled(receiver_locked)) { dlog_verbose("Notifications are not enabled.\n"); ret = ffa_error(FFA_NOT_SUPPORTED); goto out; } if (is_bind && vm_id_is_current_world(sender_vm_id) && vm_find(sender_vm_id) == NULL) { dlog_verbose("Sender VM does not exist!\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* * Can't bind/unbind notifications if at least one is bound to a * different sender. */ if (!vm_notifications_validate_bound_sender( receiver_locked, ffa_is_vm_id(sender_vm_id), id_to_validate, notifications)) { dlog_verbose( "Sender %x not permitted to set notifications %x to " "%x.\n", sender_vm_id, notifications, receiver_vm_id); ret = ffa_error(FFA_DENIED); goto out; } /** * Check if there is a pending notification within those specified in * the bitmap. */ if (vm_are_notifications_pending(receiver_locked, ffa_is_vm_id(sender_vm_id), notifications)) { dlog_verbose("Notifications within '%x' pending.\n", notifications); ret = ffa_error(FFA_DENIED); goto out; } vm_notifications_update_bindings( receiver_locked, ffa_is_vm_id(sender_vm_id), id_to_update, notifications, is_per_vcpu && is_bind); out: vm_unlock(&receiver_locked); return ret; } struct ffa_value api_ffa_notification_set( ffa_id_t sender_vm_id, ffa_id_t receiver_vm_id, uint32_t flags, ffa_notifications_bitmap_t notifications, struct vcpu *current) { struct ffa_value ret; struct vm_locked receiver_locked; /* * Check if is per-vCPU or global, and extracting vCPU ID according * to table 17.19 of the FF-A v1.1 Beta 0 spec. */ bool is_per_vcpu = (flags & FFA_NOTIFICATION_FLAG_PER_VCPU) != 0U; ffa_vcpu_index_t vcpu_id = (uint16_t)(flags >> 16); const uint32_t flags_mbz = ~(FFA_NOTIFICATIONS_FLAG_PER_VCPU | FFA_NOTIFICATIONS_FLAG_DELAY_SRI | (0xFFFFU << 16)); if ((flags_mbz & flags) != 0U) { dlog_verbose("%s: caller shouldn't set bits that MBZ.\n", __func__); return ffa_error(FFA_INVALID_PARAMETERS); } /* Global notifications must target any vCPU. */ if (!is_per_vcpu && vcpu_id != 0U) { dlog_verbose( "For global notifications vCPU ID MBZ in call to set " "notifications.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } if (!plat_ffa_is_notification_set_valid(current, sender_vm_id, receiver_vm_id)) { dlog_verbose("Invalid use of notifications set interface.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } if (notifications == 0U) { dlog_verbose("No notifications have been specified.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } if (plat_ffa_notification_set_forward(sender_vm_id, receiver_vm_id, flags, notifications, &ret)) { return ret; } /* * This check assumes receiver is the current VM, and has been enforced * by 'plat_ffa_is_notification_set_valid'. */ receiver_locked = plat_ffa_vm_find_locked(receiver_vm_id); if (receiver_locked.vm == NULL) { dlog_verbose("Receiver ID is not valid.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } if (!vm_locked_are_notifications_enabled(receiver_locked)) { dlog_verbose("Receiver's notifications not enabled.\n"); ret = ffa_error(FFA_DENIED); goto out; } /* * Check the if the notifications are bound as global if per-vCPU flag * is set, or if they are bound as per-vCPU and caller setting as * global. In either case, return FFA_INVALID_PARAMETERS. */ if (vm_notifications_validate_binding( receiver_locked, ffa_is_vm_id(sender_vm_id), sender_vm_id, notifications, !is_per_vcpu)) { dlog_verbose("Notifications in %x are %s\n", notifications, !is_per_vcpu ? "global" : "per-vCPU"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* * If notifications are not bound to the sender, they wouldn't be * enabled either for the receiver. */ if (!vm_notifications_validate_binding( receiver_locked, ffa_is_vm_id(sender_vm_id), sender_vm_id, notifications, is_per_vcpu)) { dlog_verbose("Notifications bindings not valid.\n"); ret = ffa_error(FFA_DENIED); goto out; } if (is_per_vcpu && vcpu_id >= receiver_locked.vm->vcpu_count) { dlog_verbose("Invalid VCPU ID!\n"); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* Set notifications pending. */ vm_notifications_partition_set_pending( receiver_locked, ffa_is_vm_id(sender_vm_id), notifications, vcpu_id, is_per_vcpu); dlog_verbose("Set the notifications: %x.\n", notifications); if ((FFA_NOTIFICATIONS_FLAG_DELAY_SRI & flags) == 0) { dlog_verbose("SRI was NOT delayed. vcpu: %u!\n", vcpu_index(current)); plat_ffa_sri_trigger_not_delayed(current->cpu); } else { plat_ffa_sri_state_set(DELAYED); } ret = (struct ffa_value){.func = FFA_SUCCESS_32}; out: vm_unlock(&receiver_locked); return ret; } static struct ffa_value api_ffa_notification_get_success_return( ffa_notifications_bitmap_t from_sp, ffa_notifications_bitmap_t from_vm, ffa_notifications_bitmap_t from_framework) { return (struct ffa_value){ .func = FFA_SUCCESS_32, .arg1 = 0U, .arg2 = (uint32_t)from_sp, .arg3 = (uint32_t)(from_sp >> 32), .arg4 = (uint32_t)from_vm, .arg5 = (uint32_t)(from_vm >> 32), .arg6 = (uint32_t)from_framework, .arg7 = (uint32_t)(from_framework >> 32), }; } struct ffa_value api_ffa_notification_get(ffa_id_t receiver_vm_id, ffa_vcpu_index_t vcpu_id, uint32_t flags, struct vcpu *current) { ffa_notifications_bitmap_t framework_notifications = 0; ffa_notifications_bitmap_t sp_notifications = 0; ffa_notifications_bitmap_t vm_notifications = 0; struct vm_locked receiver_locked; struct ffa_value ret; const uint32_t flags_mbz = ~(FFA_NOTIFICATION_FLAG_BITMAP_HYP | FFA_NOTIFICATION_FLAG_BITMAP_SPM | FFA_NOTIFICATION_FLAG_BITMAP_SP | FFA_NOTIFICATION_FLAG_BITMAP_VM); /* The FF-A v1.1 EAC0 specification states bits [31:4] Must Be Zero. */ if ((flags & flags_mbz) != 0U) { dlog_verbose( "Invalid flags bit(s) set in notifications get. [31:4] " "MBZ(%x)\n", flags); return ffa_error(FFA_INVALID_PARAMETERS); } /* * Following check should capture wrong uses of the interface, * depending on whether Hafnium is SPMC or hypervisor. On the * rest of the function it is assumed this condition is met. */ if (!plat_ffa_is_notification_get_valid(current, receiver_vm_id, flags)) { dlog_verbose("Invalid use of notifications get interface.\n"); return ffa_error(FFA_INVALID_PARAMETERS); } /* * This check assumes receiver is the current VM, and has been enforced * by `plat_ffa_is_notifications_get_valid`. */ receiver_locked = plat_ffa_vm_find_locked(receiver_vm_id); /* * `plat_ffa_is_notifications_get_valid` ensures following is never * true. */ CHECK(receiver_locked.vm != NULL); if (receiver_locked.vm->vcpu_count <= vcpu_id || (receiver_locked.vm->vcpu_count != 1 && cpu_index(current->cpu) != vcpu_id)) { dlog_verbose( "Invalid VCPU ID %u. vcpu count %u current core: %u!\n", vcpu_id, receiver_locked.vm->vcpu_count, cpu_index(current->cpu)); ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } if ((flags & FFA_NOTIFICATION_FLAG_BITMAP_SP) != 0U) { if (!plat_ffa_notifications_get_from_sp( receiver_locked, vcpu_id, &sp_notifications, &ret)) { dlog_verbose("Failed to get notifications from sps."); goto out; } } if ((flags & FFA_NOTIFICATION_FLAG_BITMAP_VM) != 0U) { vm_notifications = vm_notifications_partition_get_pending( receiver_locked, true, vcpu_id); } if ((flags & FFA_NOTIFICATION_FLAG_BITMAP_HYP) != 0U || (flags & FFA_NOTIFICATION_FLAG_BITMAP_SPM) != 0U) { if (!plat_ffa_notifications_get_framework_notifications( receiver_locked, &framework_notifications, flags, vcpu_id, &ret)) { dlog_verbose( "Failed to get notifications from " "framework.\n"); goto out; } } ret = api_ffa_notification_get_success_return( sp_notifications, vm_notifications, framework_notifications); /* * If there are no more pending notifications, change `sri_state` to * handled. */ if (vm_is_notifications_pending_count_zero()) { plat_ffa_sri_state_set(HANDLED); } if (!receiver_locked.vm->el0_partition && !vm_are_global_notifications_pending(receiver_locked)) { vm_notifications_set_npi_injected(receiver_locked, false); } out: vm_unlock(&receiver_locked); return ret; } /** * Prepares successful return for FFA_NOTIFICATION_INFO_GET, as described by * the section 17.7.1 of the FF-A v1.1 Beta0 specification. */ static struct ffa_value api_ffa_notification_info_get_success_return( const uint16_t *ids, uint32_t ids_count, const uint32_t *lists_sizes, uint32_t lists_count) { struct ffa_value ret = (struct ffa_value){.func = FFA_SUCCESS_64}; /* * Copying content of ids into ret structure. Use 5 registers (x3-x7) to * hold the list of ids. */ memcpy_s(&ret.arg3, sizeof(ret.arg3) * FFA_NOTIFICATIONS_INFO_GET_REGS_RET, ids, sizeof(ids[0]) * ids_count); /* * According to the spec x2 should have: * - Bit flagging if there are more notifications pending; * - The total number of elements (i.e. total list size); * - The number of VCPU IDs within each VM specific list. */ ret.arg2 = vm_notifications_pending_not_retrieved_by_scheduler() ? FFA_NOTIFICATIONS_INFO_GET_FLAG_MORE_PENDING : 0; ret.arg2 |= (lists_count & FFA_NOTIFICATIONS_LISTS_COUNT_MASK) << FFA_NOTIFICATIONS_LISTS_COUNT_SHIFT; for (unsigned int i = 0; i < lists_count; i++) { ret.arg2 |= (lists_sizes[i] & FFA_NOTIFICATIONS_LIST_SIZE_MASK) << FFA_NOTIFICATIONS_LIST_SHIFT(i + 1); } return ret; } struct ffa_value api_ffa_notification_info_get(struct vcpu *current) { /* * Following set of variables should be populated with the return info. * At a successfull handling of this interface, they should be used * to populate the 'ret' structure in accordance to the table 17.29 * of the FF-A v1.1 Beta0 specification. */ uint16_t ids[FFA_NOTIFICATIONS_INFO_GET_MAX_IDS]; uint32_t lists_sizes[FFA_NOTIFICATIONS_INFO_GET_MAX_IDS] = {0}; uint32_t lists_count = 0; uint32_t ids_count = 0; bool list_is_full = false; struct ffa_value result; /* * This interface can only be called at NS virtual/physical FF-A * instance by the endpoint implementing the primary scheduler and the * Hypervisor/OS kernel. * In the SPM, following check passes if call has been forwarded from * the hypervisor. */ if (current->vm->id != HF_PRIMARY_VM_ID) { dlog_verbose( "Only the receiver's scheduler can use this " "interface\n"); return ffa_error(FFA_NOT_SUPPORTED); } /* * Forward call to the other world, and fill the arrays used to assemble * return. */ plat_ffa_notification_info_get_forward( ids, &ids_count, lists_sizes, &lists_count, FFA_NOTIFICATIONS_INFO_GET_MAX_IDS); list_is_full = ids_count == FFA_NOTIFICATIONS_INFO_GET_MAX_IDS; /* Get notifications' info from this world */ for (ffa_vm_count_t index = 0; index < vm_get_count() && !list_is_full; ++index) { struct vm_locked vm_locked = vm_lock(vm_find_index(index)); list_is_full = vm_notifications_info_get( vm_locked, ids, &ids_count, lists_sizes, &lists_count, FFA_NOTIFICATIONS_INFO_GET_MAX_IDS); vm_unlock(&vm_locked); } if (!list_is_full) { /* Grab notifications info from other world */ plat_ffa_vm_notifications_info_get( ids, &ids_count, lists_sizes, &lists_count, FFA_NOTIFICATIONS_INFO_GET_MAX_IDS); } if (ids_count == 0) { dlog_verbose( "Notification info get has no data to retrieve.\n"); result = ffa_error(FFA_NO_DATA); } else { result = api_ffa_notification_info_get_success_return( ids, ids_count, lists_sizes, lists_count); } plat_ffa_sri_state_set(HANDLED); return result; } struct ffa_value api_ffa_mem_perm_get(vaddr_t base_addr, struct vcpu *current) { struct vm_locked vm_locked; struct ffa_value ret = ffa_error(FFA_INVALID_PARAMETERS); bool mode_ret = false; uint32_t mode = 0; if (!plat_ffa_is_mem_perm_get_valid(current)) { return ffa_error(FFA_DENIED); } if (!(current->vm->el0_partition)) { return ffa_error(FFA_DENIED); } vm_locked = vm_lock(current->vm); /* * mm_get_mode is used to check if the given base_addr page is already * mapped. If the page is unmapped, return error. If the page is mapped * appropriate attributes are returned to the caller. Note that * mm_get_mode returns true if the address is in the valid VA range as * supported by the architecture and MMU configurations, as opposed to * whether a page is mapped or not. For a page to be known as mapped, * the API must return true AND the returned mode must not have * MM_MODE_INVALID set. */ mode_ret = mm_get_mode(&vm_locked.vm->ptable, base_addr, va_add(base_addr, PAGE_SIZE), &mode); if (!mode_ret || (mode & MM_MODE_INVALID)) { ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* No memory should be marked RWX */ CHECK((mode & (MM_MODE_R | MM_MODE_W | MM_MODE_X)) != (MM_MODE_R | MM_MODE_W | MM_MODE_X)); /* * S-EL0 partitions are expected to have all their pages marked as * non-global. */ CHECK((mode & (MM_MODE_NG | MM_MODE_USER)) == (MM_MODE_NG | MM_MODE_USER)); if (mode & MM_MODE_W) { /* No memory should be writeable but not readable. */ CHECK(mode & MM_MODE_R); ret = (struct ffa_value){.func = FFA_SUCCESS_32, .arg2 = (uint32_t)(FFA_MEM_PERM_RW)}; } else if (mode & MM_MODE_R) { ret = (struct ffa_value){.func = FFA_SUCCESS_32, .arg2 = (uint32_t)(FFA_MEM_PERM_RX)}; if (!(mode & MM_MODE_X)) { ret.arg2 = (uint32_t)(FFA_MEM_PERM_RO); } } out: vm_unlock(&vm_locked); return ret; } struct ffa_value api_ffa_mem_perm_set(vaddr_t base_addr, uint32_t page_count, uint32_t mem_perm, struct vcpu *current) { struct vm_locked vm_locked; struct ffa_value ret; bool mode_ret = false; uint32_t original_mode; uint32_t new_mode; struct mpool local_page_pool; if (!plat_ffa_is_mem_perm_set_valid(current)) { return ffa_error(FFA_DENIED); } if (!(current->vm->el0_partition)) { return ffa_error(FFA_DENIED); } if (!is_aligned(va_addr(base_addr), PAGE_SIZE)) { return ffa_error(FFA_INVALID_PARAMETERS); } if ((mem_perm != FFA_MEM_PERM_RW) && (mem_perm != FFA_MEM_PERM_RO) && (mem_perm != FFA_MEM_PERM_RX)) { return ffa_error(FFA_INVALID_PARAMETERS); } /* * Create a local pool so any freed memory can't be used by another * thread. This is to ensure the original mapping can be restored if any * stage of the process fails. */ mpool_init_with_fallback(&local_page_pool, &api_page_pool); vm_locked = vm_lock(current->vm); /* * All regions accessible by the partition are mapped during boot. If we * cannot get a successful translation for the page range, the request * to change permissions is rejected. * mm_get_mode is used to check if the given address range is already * mapped. If the range is unmapped, return error. If the range is * mapped appropriate attributes are returned to the caller. Note that * mm_get_mode returns true if the address is in the valid VA range as * supported by the architecture and MMU configurations, as opposed to * whether a page is mapped or not. For a page to be known as mapped, * the API must return true AND the returned mode must not have * MM_MODE_INVALID set. */ mode_ret = mm_get_mode(&vm_locked.vm->ptable, base_addr, va_add(base_addr, page_count * PAGE_SIZE), &original_mode); if (!mode_ret || (original_mode & MM_MODE_INVALID)) { ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } /* Device memory cannot be marked as executable */ if ((original_mode & MM_MODE_D) && (mem_perm == FFA_MEM_PERM_RX)) { ret = ffa_error(FFA_INVALID_PARAMETERS); goto out; } new_mode = MM_MODE_USER | MM_MODE_NG; if (mem_perm == FFA_MEM_PERM_RW) { new_mode |= MM_MODE_R | MM_MODE_W; } else if (mem_perm == FFA_MEM_PERM_RX) { new_mode |= MM_MODE_R | MM_MODE_X; } else if (mem_perm == FFA_MEM_PERM_RO) { new_mode |= MM_MODE_R; } /* * Safe to re-map memory, since we know the requested permissions are * valid, and the memory requested to be re-mapped is also valid. */ if (!mm_identity_prepare( &vm_locked.vm->ptable, pa_from_va(base_addr), pa_from_va(va_add(base_addr, page_count * PAGE_SIZE)), new_mode, &local_page_pool)) { /* * Defrag the table into the local page pool. * mm_identity_prepare could have allocated or freed pages to * split blocks or tables etc. */ mm_stage1_defrag(&vm_locked.vm->ptable, &local_page_pool); /* * Guaranteed to succeed mapping with old mode since the mapping * with old mode already existed and we have a local page pool * that should have sufficient memory to go back to the original * state. */ CHECK(mm_identity_prepare( &vm_locked.vm->ptable, pa_from_va(base_addr), pa_from_va(va_add(base_addr, page_count * PAGE_SIZE)), original_mode, &local_page_pool)); mm_identity_commit( &vm_locked.vm->ptable, pa_from_va(base_addr), pa_from_va(va_add(base_addr, page_count * PAGE_SIZE)), original_mode, &local_page_pool); mm_stage1_defrag(&vm_locked.vm->ptable, &api_page_pool); ret = ffa_error(FFA_NO_MEMORY); goto out; } mm_identity_commit( &vm_locked.vm->ptable, pa_from_va(base_addr), pa_from_va(va_add(base_addr, page_count * PAGE_SIZE)), new_mode, &local_page_pool); ret = (struct ffa_value){.func = FFA_SUCCESS_32}; out: mpool_fini(&local_page_pool); vm_unlock(&vm_locked); return ret; } /** * Implements FF-A v1.2 FFA_CONSOLE_LOG ABI for buffered logging. */ struct ffa_value api_ffa_console_log(const struct ffa_value args, struct vcpu *current) { /* Maximum number of characters is 128: 16 registers of 8 bytes each. */ char chars[128] = {0}; const bool v1_2 = current->vm->ffa_version >= MAKE_FFA_VERSION(1, 2); const bool log32 = args.func == FFA_CONSOLE_LOG_32; /* * 32bit: always 6 registers * 64bit and less than v1.2: 6 registers * 64bit and v1.2 or greater: 16 registers */ const size_t registers_max = log32 ? 6 : (v1_2 ? 16 : 6); const size_t chars_max = registers_max * (log32 ? sizeof(uint32_t) : sizeof(uint64_t)); const size_t chars_count = args.arg1; struct vm_locked vm_locked; assert(args.func == FFA_CONSOLE_LOG_32 || args.func == FFA_CONSOLE_LOG_64); if (chars_count == 0 || chars_count > chars_max) { return ffa_error(FFA_INVALID_PARAMETERS); } if (log32) { uint32_t *registers = (uint32_t *)chars; registers[0] = args.arg2 & 0xffffffff; registers[1] = args.arg3 & 0xffffffff; registers[2] = args.arg4 & 0xffffffff; registers[3] = args.arg5 & 0xffffffff; registers[4] = args.arg6 & 0xffffffff; registers[5] = args.arg7 & 0xffffffff; } else { uint64_t *registers = (uint64_t *)chars; registers[0] = args.arg2; registers[1] = args.arg3; registers[2] = args.arg4; registers[3] = args.arg5; registers[4] = args.arg6; registers[5] = args.arg7; if (v1_2) { registers[6] = args.extended_val.arg8; registers[7] = args.extended_val.arg9; registers[8] = args.extended_val.arg10; registers[9] = args.extended_val.arg11; registers[10] = args.extended_val.arg12; registers[11] = args.extended_val.arg13; registers[12] = args.extended_val.arg14; registers[13] = args.extended_val.arg15; registers[14] = args.extended_val.arg16; registers[15] = args.extended_val.arg17; } } vm_locked = vm_lock(current->vm); for (size_t i = 0; i < chars_count; i++) { bool flush = false; const char c = chars[i]; if (c == '\n' || c == '\0') { flush = true; } else { vm_locked.vm->log_buffer [vm_locked.vm->log_buffer_length++] = c; flush = (vm_locked.vm->log_buffer_length == LOG_BUFFER_SIZE); } if (flush) { dlog_flush_vm_buffer(vm_locked.vm->id, vm_locked.vm->log_buffer, vm_locked.vm->log_buffer_length); vm_locked.vm->log_buffer_length = 0; } } vm_unlock(&vm_locked); return (struct ffa_value){.func = FFA_SUCCESS_32}; }