[RFC,04/13] kvm, vmx: Add support for gva exit qualification

Commit Message

Edgecombe, Rick P Oct. 3, 2019, 9:23 p.m. UTC

VMX supports providing the guest virtual address that caused and EPT
violation. Add support for this so it can be used by the KVM XO feature.

Signed-off-by: Rick Edgecombe <[e-mail]>
---
 arch/x86/include/asm/kvm_host.h | 4 ++++
 arch/x86/include/asm/vmx.h      | 1 +
 arch/x86/kvm/vmx/vmx.c          | 5 +++++
 arch/x86/kvm/x86.c              | 1 +
 4 files changed, 11 insertions(+)

Patch

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index bdc16b0aa7c6..b363a7fc47b0 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -781,6 +781,10 @@  struct kvm_vcpu_arch {
 	bool gpa_available;
 	gpa_t gpa_val;
 
+	/* GVA available */
+	bool gva_available;
+	gva_t gva_val;
+
 	/* be preempted when it's in kernel-mode(cpl=0) */
 	bool preempted_in_kernel;
 
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index a39136b0d509..67457f2d19e2 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -522,6 +522,7 @@  struct vmx_msr_entry {
 #define EPT_VIOLATION_READABLE_BIT	3
 #define EPT_VIOLATION_WRITABLE_BIT	4
 #define EPT_VIOLATION_EXECUTABLE_BIT	5
+#define EPT_VIOLATION_GVA_LINEAR_VALID	7
 #define EPT_VIOLATION_GVA_TRANSLATED_BIT 8
 #define EPT_VIOLATION_ACC_READ		(1 << EPT_VIOLATION_ACC_READ_BIT)
 #define EPT_VIOLATION_ACC_WRITE		(1 << EPT_VIOLATION_ACC_WRITE_BIT)
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index c030c96fc81a..a30dbab8a2d4 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5116,6 +5116,11 @@  static int handle_ept_violation(struct kvm_vcpu *vcpu)
 	error_code |= (exit_qualification & 0x100) != 0 ?
 	       PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;
 
+	if (exit_qualification | EPT_VIOLATION_GVA_LINEAR_VALID) {
+		vcpu->arch.gva_available = true;
+		vcpu->arch.gva_val = vmcs_readl(GUEST_LINEAR_ADDRESS);
+	}
+
 	vcpu->arch.exit_qualification = exit_qualification;
 	return kvm_mmu_page_fault(vcpu, gpa, error_code, NULL, 0);
 }
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 91602d310a3f..aa138d3a86c5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8092,6 +8092,7 @@  static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
 		kvm_lapic_sync_from_vapic(vcpu);
 
 	vcpu->arch.gpa_available = false;
+	vcpu->arch.gva_available = false;
 	r = kvm_x86_ops->handle_exit(vcpu);
 	return r;