From a5c214dad1985092bd21c38c2a78befed9b02294 Mon Sep 17 00:00:00 2001
From: Lan Tianyu <Tianyu.Lan@microsoft.com>
Date: Sat, 13 Oct 2018 22:54:05 +0800
Subject: [PATCH] KVM/VMX: Change hv flush logic when ept tables are
mismatched.
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>
---
arch/x86/kvm/vmx.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 0050fe81d8571..a9ed7a723a0c4 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -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;
}
--
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