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hv: pause all other vCPUs in same VM when do wbinvd emulation

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Invalidate cache by scanning and flushing the whole guest memory is
inefficient which might cause long execution time for WBINVD emulation.
A long execution in hypervisor might cause a vCPU stuck phenomenon what
impact Windows Guest booting.

This patch introduce a workaround method that pausing all other vCPUs in
the same VM when do wbinvd emulation.

Tracked-On: #4703
Signed-off-by: Shuo A Liu <shuo.a.liu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Shuo A Liu 2020-04-16 13:45:43 +08:00 committed by wenlingz
parent a335679ce9
commit 9a15ea82ee
4 changed files with 42 additions and 2 deletions
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11
hypervisor/arch/x86/guest/ept.c
View File

@ -241,6 +241,17 @@ void walk_ept_table(struct acrn_vm *vm, pge_handler cb)
}
}
}
/*
* Walk through the whole page tables of one VM is a time-consuming
* operation. Preemption is not support by hypervisor scheduling
* currently, so the walk through page tables operation might occupy
* CPU for long time what starve other threads.
*
* Give chance to release CPU to make other threads happy.
*/
if (need_reschedule(get_pcpu_id())) {
schedule();
}
}
}
}

3
hypervisor/arch/x86/guest/virq.c
View File

@ -374,6 +374,9 @@ int32_t acrn_handle_pending_request(struct acrn_vcpu *vcpu)
pr_fatal("Triple fault happen -> shutdown!");
ret = -EFAULT;
} else {
if (bitmap_test_and_clear_lock(ACRN_REQUEST_WAIT_WBINVD, pending_req_bits)) {
wait_event(&vcpu->events[VCPU_EVENT_SYNC_WBINVD]);
}
if (bitmap_test_and_clear_lock(ACRN_REQUEST_EPT_FLUSH, pending_req_bits)) {
invept(vcpu->vm->arch_vm.nworld_eptp);

20
hypervisor/arch/x86/guest/vmexit.c
View File

@ -379,10 +379,30 @@ static int32_t xsetbv_vmexit_handler(struct acrn_vcpu *vcpu)
static int32_t wbinvd_vmexit_handler(struct acrn_vcpu *vcpu)
{
uint16_t i;
struct acrn_vcpu *other;
if (has_rt_vm() == false) {
cache_flush_invalidate_all();
} else {
if (is_rt_vm(vcpu->vm)) {
walk_ept_table(vcpu->vm, ept_flush_leaf_page);
} else {
/* Pause other vcpus and let them wait for the wbinvd completion */
foreach_vcpu(i, vcpu->vm, other) {
if (other != vcpu) {
vcpu_make_request(other, ACRN_REQUEST_WAIT_WBINVD);
}
}
walk_ept_table(vcpu->vm, ept_flush_leaf_page);
foreach_vcpu(i, vcpu->vm, other) {
if (other != vcpu) {
signal_event(&other->events[VCPU_EVENT_SYNC_WBINVD]);
}
}
}
}
return 0;

8
hypervisor/include/arch/x86/guest/vcpu.h
View File

@ -93,6 +93,11 @@
*/
#define ACRN_REQUEST_INIT_VMCS 8U
/**
* @brief Request for sync waiting WBINVD
*/
#define ACRN_REQUEST_WAIT_WBINVD 9U
/**
* @}
*/
@ -148,7 +153,8 @@ enum vm_cpu_mode {
#define VCPU_EVENT_IOREQ 0
#define VCPU_EVENT_VIRTUAL_INTERRUPT 1
#define VCPU_EVENT_NUM 2
#define VCPU_EVENT_SYNC_WBINVD 2
#define VCPU_EVENT_NUM 3
enum reset_mode;