diff mbox series

[8/8] KVM: x86: drop KVM_PV_REASON_PAGE_READY case from kvm_handle_page_fault()

Message ID 20200511164752.2158645-9-vkuznets@redhat.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: Interrupt-based mechanism for async_pf 'page present' notifications | expand

Commit Message

Vitaly Kuznetsov May 11, 2020, 4:47 p.m. UTC 
KVM guest code in Linux enables APF only when KVM_FEATURE_ASYNC_PF_INT
is supported, this means we will never see KVM_PV_REASON_PAGE_READY
when handling page fault vmexit in KVM.

While on it, make sure we only follow genuine page fault path when
APF reason is zero. If we happen to see something else this means
that the underlying hypervisor is misbehaving. Leave WARN_ON_ONCE()
to catch that.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/kvm/mmu/mmu.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 8071952e9cf2..5a9fca908ca9 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4187,7 +4187,7 @@  int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
 
 	vcpu->arch.l1tf_flush_l1d = true;
 	switch (vcpu->arch.apf.host_apf_reason) {
-	default:
+	case 0:
 		trace_kvm_page_fault(fault_address, error_code);
 
 		if (kvm_event_needs_reinjection(vcpu))
@@ -4201,12 +4201,8 @@  int kvm_handle_page_fault(struct kvm_vcpu *vcpu, u64 error_code,
 		kvm_async_pf_task_wait(fault_address, 0);
 		local_irq_enable();
 		break;
-	case KVM_PV_REASON_PAGE_READY:
-		vcpu->arch.apf.host_apf_reason = 0;
-		local_irq_disable();
-		kvm_async_pf_task_wake(fault_address);
-		local_irq_enable();
-		break;
+	default:
+		WARN_ON_ONCE(1);
 	}
 	return r;
 }