From: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
[ upstream commit 2a266f23550be997d783f27e704b9b40c4010292 Mon Sep 17 00:00:00 2001 ]
For example, when two APF's for page ready happen after one exit and
the first one becomes pending, the second one will result in #DF.
Instead, just handle the second page fault synchronously.
Reported-by: Ross Zwisler <zwisler@xxxxxxxxx>
Message-ID: <CAOxpaSUBf8QoOZQ1p4KfUp0jq76OKfGY4Uxs-Gg8ngReD99xww@xxxxxxxxxxxxxx>
Reported-by: Alec Blayne <ab@xxxxxxxxx>
Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
Fixes: 664f8e26b00c7673a8303b0d40853a0c24ca93e1
Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
---
arch/x86/kvm/mmu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index c4deb1f34faa..e577bacd4bd0 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -3781,7 +3781,8 @@ static int kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn)
bool kvm_can_do_async_pf(struct kvm_vcpu *vcpu)
{
if (unlikely(!lapic_in_kernel(vcpu) ||
- kvm_event_needs_reinjection(vcpu)))
+ kvm_event_needs_reinjection(vcpu) ||
+ vcpu->arch.exception.pending))
return false;
if (!vcpu->arch.apf.delivery_as_pf_vmexit && is_guest_mode(vcpu))
--
1.8.3.1