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>
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index 2b5b2d4..25a482f 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -500,6 +500,22 @@
#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 a236dec..81159a3 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6374,14 +6374,20 @@
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;