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hypervisor: use "wbinvd" carefully in RT environment

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Due to the side-effect to cache of "wbinvd" instruction, just apply it
in case of noncoherent DMA.

Tracked-On: #1824
Signed-off-by: Zheng, Gen <gen.zheng@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@intel.com>
This commit is contained in:
Zheng, Gen
2018-11-14 22:03:04 +08:00
committed by lijinxia
parent 61e6c1f054
commit b32e689a64
4 changed files with 47 additions and 5 deletions
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12
hypervisor/arch/x86/vmexit.c
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@@ -14,6 +14,7 @@
static int unhandled_vmexit_handler(struct acrn_vcpu *vcpu);
static int xsetbv_vmexit_handler(struct acrn_vcpu *vcpu);
static int wbinvd_vmexit_handler(struct acrn_vcpu *vcpu);
/* VM Dispatch table for Exit condition handling */
static const struct vm_exit_dispatch dispatch_table[NR_VMX_EXIT_REASONS] = {
@@ -127,7 +128,7 @@ static const struct vm_exit_dispatch dispatch_table[NR_VMX_EXIT_REASONS] = {
[VMX_EXIT_REASON_INVVPID] = {
.handler = unhandled_vmexit_handler},
[VMX_EXIT_REASON_WBINVD] = {
.handler = unhandled_vmexit_handler},
.handler = wbinvd_vmexit_handler},
[VMX_EXIT_REASON_XSETBV] = {
.handler = xsetbv_vmexit_handler},
[VMX_EXIT_REASON_APIC_WRITE] = {
@@ -360,3 +361,12 @@ static int xsetbv_vmexit_handler(struct acrn_vcpu *vcpu)
write_xcr(0, val64);
return 0;
}
static int wbinvd_vmexit_handler(struct acrn_vcpu *vcpu)
{
if (!iommu_snoop_supported(vcpu->vm)) {
cache_flush_invalidate_all();
}
return 0;
}