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@xxxxxxxxxx>
---
arch/x86/include/asm/vmx.h | 16 ++++++++++++++++
arch/x86/kvm/vmx.c | 22 ++++++++++++++--------
2 files changed, 30 insertions(+), 8 deletions(-)
diff --git a/arch/x86/include/asm/vmx.h b/arch/x86/include/asm/vmx.h
index a002b07..60991fb 100644
--- a/arch/x86/include/asm/vmx.h
+++ b/arch/x86/include/asm/vmx.h
@@ -465,6 +465,22 @@ 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 cf1b16d..88e3b02 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6170,14 +6170,20 @@ 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_BIT) & 1)
+ << PFERR_USER_BIT;
+ /* Is it a write fault? */
+ error_code |= ((exit_qualification >> EPT_VIOLATION_WRITE_BIT) & 1)
+ << PFERR_WRITE_BIT;
+ /* Is it a fetch fault? */
+ error_code |= ((exit_qualification >> EPT_VIOLATION_INSTR_BIT) & 1)
+ << PFERR_FETCH_BIT;
+ /* ept page table entry is present? */
+ error_code |= (((exit_qualification >> EPT_VIOLATION_READABLE_BIT) |
+ (exit_qualification >> EPT_VIOLATION_WRITABLE_BIT) |
+ (exit_qualification >> EPT_VIOLATION_EXECUTABLE_BIT))
+ & 1) << PFERR_PRESENT_BIT;
vcpu->arch.exit_qualification = exit_qualification;
--
2.8.0.rc3.226.g39d4020
--
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