KVM: VMX: Fix check for valid GVA on an EPT violation

[ Upstream commit d0164c161923ac303bd843e04ebe95cfd03c6e19 ]

On an EPT violation, bit 7 of the exit qualification is set if the
guest linear-address is valid. The derived page fault error code
should not be checked for this bit.

Fixes: f300948 ("KVM: VMX: Set PFERR_GUEST_{FINAL,PAGE}_MASK if and only if the GVA is valid")
Cc: stable@vger.kernel.org
Signed-off-by: Sukrit Bhatnagar <Sukrit.Bhatnagar@sony.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://patch.msgid.link/20251106052853.3071088-1-Sukrit.Bhatnagar@sony.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 3010739f53438b87216d4c04b19f8139cf44e40b)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>

Author: Sukrit Bhatnagar

arch/x86/kvm/vmx/common.h

@@ -24,7 +24,7 @@ static inline int __vmx_handle_ept_violation(struct kvm_vcpu *vcpu, gpa_t gpa,
 	error_code |= (exit_qualification & EPT_VIOLATION_RWX_MASK)
 		      ? PFERR_PRESENT_MASK : 0;
 
-	if (error_code & EPT_VIOLATION_GVA_IS_VALID)
+	if (exit_qualification & EPT_VIOLATION_GVA_IS_VALID)
 		error_code |= (exit_qualification & EPT_VIOLATION_GVA_TRANSLATED) ?
 			      PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;