From: Eugene Korenevsky <ekorenevsky@gmail.com>
Date: Tue, 16 Dec 2014 19:35:53 +0000 (+0300)
Subject: KVM: nVMX: consult PFEC_MASK and PFEC_MATCH when generating #PF VM-exit
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=19d5f10b3ad08f596d2682404af9a3a9030aa684;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

KVM: nVMX: consult PFEC_MASK and PFEC_MATCH when generating #PF VM-exit

When generating #PF VM-exit, check equality:
(PFEC & PFEC_MASK) == PFEC_MATCH
If there is equality, the 14 bit of exception bitmap is used to take decision
about generating #PF VM-exit. If there is inequality, inverted 14 bit is used.

Signed-off-by: Eugene Korenevsky <ekorenevsky@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 70bdcf946f95..e14c96e574ff 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -8206,6 +8206,18 @@ static void nested_ept_uninit_mmu_context(struct kvm_vcpu *vcpu)
 	vcpu->arch.walk_mmu = &vcpu->arch.mmu;
 }
 
+static bool nested_vmx_is_page_fault_vmexit(struct vmcs12 *vmcs12,
+					    u16 error_code)
+{
+	bool inequality, bit;
+
+	bit = (vmcs12->exception_bitmap & (1u << PF_VECTOR)) != 0;
+	inequality =
+		(error_code & vmcs12->page_fault_error_code_mask) !=
+		 vmcs12->page_fault_error_code_match;
+	return inequality ^ bit;
+}
+
 static void vmx_inject_page_fault_nested(struct kvm_vcpu *vcpu,
 		struct x86_exception *fault)
 {
@@ -8213,8 +8225,7 @@ static void vmx_inject_page_fault_nested(struct kvm_vcpu *vcpu,
 
 	WARN_ON(!is_guest_mode(vcpu));
 
-	/* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */
-	if (vmcs12->exception_bitmap & (1u << PF_VECTOR))
+	if (nested_vmx_is_page_fault_vmexit(vmcs12, fault->error_code))
 		nested_vmx_vmexit(vcpu, to_vmx(vcpu)->exit_reason,
 				  vmcs_read32(VM_EXIT_INTR_INFO),
 				  vmcs_readl(EXIT_QUALIFICATION));