From: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
This is needed for kvm_page_track_emulation_failure().
When the introspection tool {read,write,exec}-protect a guest memory
page, it is notified from the read/write/fetch callbacks used by
the KVM emulator. If the emulation fails it is possible that the
read/write callbacks were not used. In such cases, the emulator will
call kvm_page_track_emulation_failure() to ensure that the introspection
tool is notified of the read/write #PF (based on this saved error code),
which in turn can emulate the instruction or unprotect the memory page
(and let the guest execute the instruction).
Signed-off-by: Mihai Donțu <mdontu@xxxxxxxxxxxxxxx>
Signed-off-by: Adalbert Lazăr <alazar@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 3 +++
arch/x86/kvm/svm/svm.c | 2 ++
arch/x86/kvm/vmx/vmx.c | 1 +
3 files changed, 6 insertions(+)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index f04a01dac423..2530af4420cf 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -837,6 +837,9 @@ struct kvm_vcpu_arch {
/* AMD MSRC001_0015 Hardware Configuration */
u64 msr_hwcr;
+
+ /* #PF translated error code from EPT/NPT exit reason */
+ u64 error_code;
};
struct kvm_lpage_info {
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 9c8e77193f98..1ec88ff241ab 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -1799,6 +1799,8 @@ static int npf_interception(struct vcpu_svm *svm)
u64 fault_address = __sme_clr(svm->vmcb->control.exit_info_2);
u64 error_code = svm->vmcb->control.exit_info_1;
+ svm->vcpu.arch.error_code = error_code;
+
trace_kvm_page_fault(fault_address, error_code);
return kvm_mmu_page_fault(&svm->vcpu, fault_address, error_code,
static_cpu_has(X86_FEATURE_DECODEASSISTS) ?
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index cd498ece8b52..6554c2278176 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5365,6 +5365,7 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
? PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;
vcpu->arch.exit_qualification = exit_qualification;
+ vcpu->arch.error_code = error_code;
return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
}
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