KVM: MMU: Propagate the right fault back to the guest after gva_to_gpa
This patch implements logic to make sure that either a
page-fault/page-fault-vmexit or a nested-page-fault-vmexit
is propagated back to the guest.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 08bc383..574db6d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -660,6 +660,7 @@
int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
gfn_t gfn, void *data, int offset, int len,
u32 access);
+void kvm_propagate_fault(struct kvm_vcpu *vcpu);
bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl);
int kvm_pic_set_irq(void *opaque, int irq, int level);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e4c76bf..0281d92 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -338,6 +338,22 @@
kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
}
+void kvm_propagate_fault(struct kvm_vcpu *vcpu)
+{
+ u32 nested, error;
+
+ error = vcpu->arch.fault.error_code;
+ nested = error & PFERR_NESTED_MASK;
+ error = error & ~PFERR_NESTED_MASK;
+
+ vcpu->arch.fault.error_code = error;
+
+ if (mmu_is_nested(vcpu) && !nested)
+ vcpu->arch.nested_mmu.inject_page_fault(vcpu);
+ else
+ vcpu->arch.mmu.inject_page_fault(vcpu);
+}
+
void kvm_inject_nmi(struct kvm_vcpu *vcpu)
{
vcpu->arch.nmi_pending = 1;
@@ -4140,7 +4156,7 @@
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
if (ctxt->exception == PF_VECTOR)
- kvm_inject_page_fault(vcpu);
+ kvm_propagate_fault(vcpu);
else if (ctxt->error_code_valid)
kvm_queue_exception_e(vcpu, ctxt->exception, ctxt->error_code);
else