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hv: add function to return to VM0

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Emulate VM0 resume from S3 state:
 - reset BSP of VM0
 - set the BSP entry to saved VM0 wakeup vec and set BSP to real mode
 - start BSP

To match trampoline_spinlock release on ACRN Sx resume path, acquire
trampoline_spinlock if ACRN Sx enter fails.

Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Yin Fengwei 2018-06-14 23:05:08 +08:00 committed by Xie, nanlin
parent 02d819144e
commit 0f9d9641d4
3 changed files with 36 additions and 0 deletions
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22
hypervisor/arch/x86/guest/vm.c
View File

@ -285,6 +285,28 @@ void resume_vm(struct vm *vm)
vm->state = VM_STARTED;
}
/* Resume vm from S3 state
*
* To resume vm after guest enter S3 state:
* - reset BSP
* - BSP will be put to real mode with entry set as wakeup_vec
* - init_vmcs BSP. We could call init_vmcs here because we know current
* pcpu is mapped to BSP of vm.
*/
void resume_vm_from_s3(struct vm *vm, uint32_t wakeup_vec)
{
struct vcpu *bsp = vcpu_from_vid(vm, 0);
vm->state = VM_STARTED;
reset_vcpu(bsp);
bsp->entry_addr = (void *)(uint64_t)wakeup_vec;
bsp->arch_vcpu.cpu_mode = CPU_MODE_REAL;
init_vmcs(bsp);
schedule_vcpu(bsp);
}
/* Create vm/vcpu for vm0 */
int prepare_vm0(void)
{

13
hypervisor/arch/x86/pm.c
View File

@ -72,6 +72,7 @@ int enter_s3(struct vm *vm, uint32_t pm1a_cnt_val,
{
uint32_t pcpu_id;
uint64_t pmain_entry_saved;
uint32_t guest_wakeup_vec32;
uint64_t *pmain_entry;
if (vm->pm.sx_state_data == NULL) {
@ -83,6 +84,15 @@ int enter_s3(struct vm *vm, uint32_t pm1a_cnt_val,
pcpu_id = get_cpu_id();
/* Save the wakeup vec set by guest. Will return to guest
* with this wakeup vec as entry.
*/
guest_wakeup_vec32 = *vm->pm.sx_state_data->wake_vector_32;
/* set ACRN wakeup vec instead */
*vm->pm.sx_state_data->wake_vector_32 =
(uint32_t) trampoline_start16_paddr;
/* offline all APs */
stop_cpus();
@ -128,5 +138,8 @@ int enter_s3(struct vm *vm, uint32_t pm1a_cnt_val,
/* online all APs again */
start_cpus();
/* jump back to vm */
resume_vm_from_s3(vm, guest_wakeup_vec32);
return 0;
}

1
hypervisor/include/arch/x86/guest/vm.h
View File

@ -172,6 +172,7 @@ struct vm_description {
int shutdown_vm(struct vm *vm);
void pause_vm(struct vm *vm);
void resume_vm(struct vm *vm);
void resume_vm_from_s3(struct vm *vm, uint32_t wakeup_vec);
int start_vm(struct vm *vm);
int create_vm(struct vm_description *vm_desc, struct vm **vm);
int prepare_vm0(void);