mirror of
https://github.com/projectacrn/acrn-hypervisor.git
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7f57a74fe7
For all the hypercalls, we sync the comments from .h to .c as comments in .h file are used in architectural design and the comments in .c are used in module design. Tracked-On: #1595 Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
134 lines
3.2 KiB
C
134 lines
3.2 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 <hypervisor.h>
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#include <hypercall.h>
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#define ACRN_DBG_TRUSTY_HYCALL 6U
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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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if (next_world_id >= NR_WORLD) {
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dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
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"%s world_id %d exceed max number of Worlds\n",
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__func__, next_world_id);
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return -EINVAL;
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}
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if (vcpu->vm->sworld_control.flag.supported == 0UL) {
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dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
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"Secure World is not supported!\n");
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return -EPERM;
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}
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if (vcpu->vm->sworld_control.flag.active == 0UL) {
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dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
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"Trusty is not initialized!\n");
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return -EPERM;
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}
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switch_world(vcpu, next_world_id);
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return 0;
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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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if (vcpu->vm->sworld_control.flag.supported == 0UL) {
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dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
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"Secure World is not supported!\n");
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return -EPERM;
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}
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if (vcpu->vm->sworld_control.flag.active != 0UL) {
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dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
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"Trusty already initialized!\n");
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return -EPERM;
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}
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if (vcpu->arch.cur_context != NORMAL_WORLD) {
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dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
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"%s, must initialize Trusty from Normal World!\n",
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__func__);
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return -EPERM;
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}
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if (!initialize_trusty(vcpu, param)) {
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return -ENODEV;
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}
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vcpu->vm->sworld_control.flag.active = 1UL;
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return 0;
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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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int64_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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if (vm->sworld_control.flag.supported == 0UL) {
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dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
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"Secure World is not supported!\n");
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return -EPERM;
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}
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/* Currently, Secure World is only running on vCPU0 */
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if (!is_vcpu_bsp(vcpu)) {
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dev_dbg(ACRN_DBG_TRUSTY_HYCALL,
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"This hypercall is only allowed from vcpu0!");
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return -EPERM;
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}
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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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} 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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}
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}
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return 0;
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}
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