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Subject[PATCH 18/27] KVM: MMU: Propagate the right fault back to the guest after gva_to_gpa
Date
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>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/x86.c | 19 +++++++++++++++++--
2 files changed, 18 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index e5eb57c..173834b 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -663,6 +663,7 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long cr2,
int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
gfn_t gfn, void *data, int offset, int len,
u32 *error);
+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 38d482d..65b00f0 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -337,6 +337,22 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
}

+void kvm_propagate_fault(struct kvm_vcpu *vcpu)
+{
+ unsigned long address;
+ u32 nested, error;
+
+ address = vcpu->arch.fault.address;
+ error = vcpu->arch.fault.error_code;
+ nested = error & PFERR_NESTED_MASK;
+ error = error & ~PFERR_NESTED_MASK;
+
+ if (mmu_is_nested(vcpu) && !nested)
+ vcpu->arch.nested_mmu.inject_page_fault(vcpu, address, error);
+ else
+ vcpu->arch.mmu.inject_page_fault(vcpu, address, error);
+}
+
void kvm_inject_nmi(struct kvm_vcpu *vcpu)
{
vcpu->arch.nmi_pending = 1;
@@ -4130,8 +4146,7 @@ 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, vcpu->arch.fault.address,
- vcpu->arch.fault.error_code);
+ kvm_propagate_fault(vcpu);
else if (ctxt->error_code_valid)
kvm_queue_exception_e(vcpu, ctxt->exception, ctxt->error_code);
else
--
1.7.0.4



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