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KVM/VMX: Change hv flush logic when ept tables are mismatched.

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If ept table pointers are mismatched, flushing tlb for each vcpus via
hv flush interface still helps to reduce vmexits which are triggered
by IPI and INEPT emulation.

Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Lan Tianyu 2018-10-13 22:54:05 +08:00 committed by Paolo Bonzini
parent 44c2d667ce
commit a5c214dad1
1 changed files with 8 additions and 7 deletions
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15
arch/x86/kvm/vmx.c
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@ -1571,7 +1571,8 @@ static void check_ept_pointer_match(struct kvm *kvm)
static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
{
int ret;
struct kvm_vcpu *vcpu;
int ret = -ENOTSUPP, i;
spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock);
@ -1579,14 +1580,14 @@ static int vmx_hv_remote_flush_tlb(struct kvm *kvm)
check_ept_pointer_match(kvm);
if (to_kvm_vmx(kvm)->ept_pointers_match != EPT_POINTERS_MATCH) {
ret = -ENOTSUPP;
goto out;
kvm_for_each_vcpu(i, vcpu, kvm)
ret |= hyperv_flush_guest_mapping(
to_vmx(kvm_get_vcpu(kvm, i))->ept_pointer);
} else {
ret = hyperv_flush_guest_mapping(
to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer);
}
ret = hyperv_flush_guest_mapping(
to_vmx(kvm_get_vcpu(kvm, 0))->ept_pointer);
out:
spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock);
return ret;
}