kvm: x86: mmu: Use symbolic constants for EPT Violation Exit Qualifications

This change adds some symbolic constants for VM Exit Qualifications
related to EPT Violations and updates handle_ept_violation() to use
these constants instead of hard-coded numbers.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2 files changed, 30 insertions, 8 deletions

diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 2b5b2d4b924e..25a482fb5241 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -500,6 +500,22 @@ struct vmx_msr_entry {
 #define ENTRY_FAIL_VMCS_LINK_PTR        4
 
 /*
+ * Exit Qualifications for EPT Violations
+ */
+#define EPT_VIOLATION_READ_BIT          0
+#define EPT_VIOLATION_WRITE_BIT         1
+#define EPT_VIOLATION_INSTR_BIT         2
+#define EPT_VIOLATION_READABLE_BIT      3
+#define EPT_VIOLATION_WRITABLE_BIT      4
+#define EPT_VIOLATION_EXECUTABLE_BIT    5
+#define EPT_VIOLATION_READ              (1 << EPT_VIOLATION_READ_BIT)
+#define EPT_VIOLATION_WRITE             (1 << EPT_VIOLATION_WRITE_BIT)
+#define EPT_VIOLATION_INSTR             (1 << EPT_VIOLATION_INSTR_BIT)
+#define EPT_VIOLATION_READABLE          (1 << EPT_VIOLATION_READABLE_BIT)
+#define EPT_VIOLATION_WRITABLE          (1 << EPT_VIOLATION_WRITABLE_BIT)
+#define EPT_VIOLATION_EXECUTABLE        (1 << EPT_VIOLATION_EXECUTABLE_BIT)
+
+/*
  * VM-instruction error numbers
  */
 enum vm_instruction_error_number {
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index a236decb81e4..81159a3878f4 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6374,14 +6374,20 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
         gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
         trace_kvm_page_fault(gpa, exit_qualification);
 
-        /* it is a read fault? */
-        error_code = (exit_qualification << 2) & PFERR_USER_MASK;
-        /* it is a write fault? */
-        error_code |= exit_qualification & PFERR_WRITE_MASK;
-        /* It is a fetch fault? */
-        error_code |= (exit_qualification << 2) & PFERR_FETCH_MASK;
-        /* ept page table is present? */
-        error_code |= (exit_qualification & 0x38) != 0;
+        /* Is it a read fault? */
+        error_code = (exit_qualification & EPT_VIOLATION_READ)
+                     ? PFERR_USER_MASK : 0;
+        /* Is it a write fault? */
+        error_code |= (exit_qualification & EPT_VIOLATION_WRITE)
+                      ? PFERR_WRITE_MASK : 0;
+        /* Is it a fetch fault? */
+        error_code |= (exit_qualification & EPT_VIOLATION_INSTR)
+                      ? PFERR_FETCH_MASK : 0;
+        /* ept page table entry is present? */
+        error_code |= (exit_qualification &
+                       (EPT_VIOLATION_READABLE | EPT_VIOLATION_WRITABLE |
+                        EPT_VIOLATION_EXECUTABLE))
+                      ? PFERR_PRESENT_MASK : 0;
 
         vcpu->arch.exit_qualification = exit_qualification;