[COMMIT master] KVM: MMU: Propagate the right fault back to the guest after gva_to_gpa

[Avi Kivity]

From: Joerg Roedel <joerg.roe...@amd.com>

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.roe...@amd.com>
Signed-off-by: Avi Kivity <a...@redhat.com>

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 5d9e0bb..61d94cd 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -660,6 +660,7 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu);
 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 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu)
        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 @@ static void inject_emulated_exception(struct kvm_vcpu 
*vcpu)
 {
        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
--
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