acrn-hypervisor/hypervisor/common/trusty_hypercall.c

110 lines
3.0 KiB
C

/*
* Copyright (C) 2018 Intel Corporation. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <asm/guest/vm.h>
#include <hypercall.h>
#include <errno.h>
#include <logmsg.h>
/**
* @brief Switch vCPU state between Normal/Secure World.
*
* * The hypervisor uses this hypercall to do the world switch
* * The hypervisor needs to:
* * save current world vCPU contexts, and load the next world
* vCPU contexts
* * update ``rdi``, ``rsi``, ``rdx``, ``rbx`` to next world
* vCPU contexts
*
* @param vcpu Pointer to VCPU data structure
*
* @return 0 on success, non-zero on error.
*/
int32_t hcall_world_switch(struct acrn_vcpu *vcpu, __unused struct acrn_vm *target_vm,
__unused uint64_t param1, __unused uint64_t param2)
{
int32_t next_world_id = !(vcpu->arch.cur_context);
int32_t ret = -EPERM;
if ((vcpu->vm->sworld_control.flag.supported != 0UL) && (next_world_id < NR_WORLD)
&& (vcpu->vm->sworld_control.flag.active != 0UL)) {
switch_world(vcpu, next_world_id);
ret = 0;
}
return ret;
}
/**
* @brief Initialize environment for Trusty-OS on a vCPU.
*
* * It is used by the User OS bootloader (``UOS_Loader``) to request ACRN
* to initialize Trusty
* * The Trusty memory region range, entry point must be specified
* * The hypervisor needs to save current vCPU contexts (Normal World)
*
* @param vcpu Pointer to vCPU data structure
* @param param1 guest physical address. This gpa points to trusty_boot_param structure
*
* @return 0 on success, non-zero on error.
*/
int32_t hcall_initialize_trusty(struct acrn_vcpu *vcpu, __unused struct acrn_vm *target_vm,
uint64_t param1, __unused uint64_t param2)
{
int32_t ret = -EFAULT;
if ((vcpu->vm->sworld_control.flag.supported != 0UL)
&& (vcpu->vm->sworld_control.flag.active == 0UL)
&& (vcpu->arch.cur_context == NORMAL_WORLD)) {
struct trusty_boot_param boot_param;
if (copy_from_gpa(vcpu->vm, &boot_param, param1, sizeof(boot_param)) == 0) {
if (initialize_trusty(vcpu, &boot_param)) {
vcpu->vm->sworld_control.flag.active = 1UL;
ret = 0;
}
}
} else {
ret = -EPERM;
pr_err("%s, context mismatch when initialize trusty.\n", __func__);
}
return ret;
}
/**
* @brief Save/Restore Context of Secure World.
*
* @param vcpu Pointer to VCPU data structure
*
* @return 0 on success, non-zero on error.
*/
int32_t hcall_save_restore_sworld_ctx(struct acrn_vcpu *vcpu, __unused struct acrn_vm *target_vm,
__unused uint64_t param1, __unused uint64_t param2)
{
struct acrn_vm *vm = vcpu->vm;
int32_t ret = -EINVAL;
if (is_vcpu_bsp(vcpu) && (vm->sworld_control.flag.supported != 0UL)) {
if (vm->sworld_control.flag.active != 0UL) {
save_sworld_context(vcpu);
vm->sworld_control.flag.ctx_saved = 1UL;
ret = 0;
} else {
if (vm->sworld_control.flag.ctx_saved != 0UL) {
restore_sworld_context(vcpu);
vm->sworld_control.flag.ctx_saved = 0UL;
vm->sworld_control.flag.active = 1UL;
ret = 0;
}
}
} else {
ret = -EPERM;
pr_err("%s, states mismatch when save restore sworld context.\n", __func__);
}
return ret;
}