108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
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* Copyright (C) 2018 Intel Corporation. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <vm.h>
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#include <hypercall.h>
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#include <errno.h>
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#include <logmsg.h>
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/**
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* @brief Switch vCPU state between Normal/Secure World.
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*
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* * The hypervisor uses this hypercall to do the world switch
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* * The hypervisor needs to:
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* * save current world vCPU contexts, and load the next world
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* vCPU contexts
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* * update ``rdi``, ``rsi``, ``rdx``, ``rbx`` to next world
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* vCPU contexts
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*
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* @param vcpu Pointer to VCPU data structure
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*
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* @return 0 on success, non-zero on error.
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*/
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int32_t hcall_world_switch(struct acrn_vcpu *vcpu)
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{
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int32_t next_world_id = !(vcpu->arch.cur_context);
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int32_t ret = -EPERM;
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if ((vcpu->vm->sworld_control.flag.supported != 0UL) && (next_world_id < NR_WORLD)
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&& (vcpu->vm->sworld_control.flag.active != 0UL)) {
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switch_world(vcpu, next_world_id);
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ret = 0;
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}
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return ret;
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}
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/**
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* @brief Initialize environment for Trusty-OS on a vCPU.
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*
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* * It is used by the User OS bootloader (``UOS_Loader``) to request ACRN
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* to initialize Trusty
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* * The Trusty memory region range, entry point must be specified
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* * The hypervisor needs to save current vCPU contexts (Normal World)
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*
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* @param vcpu Pointer to vCPU data structure
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* @param param guest physical address. This gpa points to
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* trusty_boot_param structure
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*
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* @return 0 on success, non-zero on error.
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*/
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int32_t hcall_initialize_trusty(struct acrn_vcpu *vcpu, uint64_t param)
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{
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int32_t ret = -EFAULT;
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if ((vcpu->vm->sworld_control.flag.supported != 0UL)
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&& (vcpu->vm->sworld_control.flag.active == 0UL)
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&& (vcpu->arch.cur_context == NORMAL_WORLD)) {
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struct trusty_boot_param boot_param;
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if (copy_from_gpa(vcpu->vm, &boot_param, param, sizeof(boot_param)) == 0) {
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if (initialize_trusty(vcpu, &boot_param)) {
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vcpu->vm->sworld_control.flag.active = 1UL;
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ret = 0;
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}
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}
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} else {
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ret = -EPERM;
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pr_err("%s, context mismatch when initialize trusty.\n", __func__);
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}
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return ret;
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}
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/**
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* @brief Save/Restore Context of Secure World.
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*
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* @param vcpu Pointer to VCPU data structure
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*
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* @return 0 on success, non-zero on error.
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*/
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int32_t hcall_save_restore_sworld_ctx(struct acrn_vcpu *vcpu)
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{
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struct acrn_vm *vm = vcpu->vm;
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int32_t ret = -EINVAL;
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if (is_vcpu_bsp(vcpu) && (vm->sworld_control.flag.supported != 0UL)) {
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if (vm->sworld_control.flag.active != 0UL) {
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save_sworld_context(vcpu);
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vm->sworld_control.flag.ctx_saved = 1UL;
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ret = 0;
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} else {
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if (vm->sworld_control.flag.ctx_saved != 0UL) {
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restore_sworld_context(vcpu);
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vm->sworld_control.flag.ctx_saved = 0UL;
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vm->sworld_control.flag.active = 1UL;
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ret = 0;
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}
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}
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} else {
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ret = -EPERM;
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pr_err("%s, states mismatch when save restore sworld context.\n", __func__);
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}
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return ret;
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}
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