commit b3f37707b05e9ce82d5bec660e9d0b15452ee9a0
author Nitin A Kamble <nitin.a.kamble@intel.com> Thu May 17 15:50:34 2007 +0300
committer Avi Kivity <avi@qumranet.com> Mon Jul 16 12:05:41 2007 +0300
tree a4d210f6449be292cfd9171c3e3e972ff2773234
parent cd2276a795b013d1416c96b38eec90a66cdd10c4

KVM: VMX: Handle #SS faults from real mode

Instructions with address size override prefix opcode 0x67
Cause the #SS fault with 0 error code in VM86 mode.  Forward
them to the emulator.

Signed-Off-By: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

drivers/kvm/vmx.c

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index c4c5535..a05bfa0 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1488,7 +1488,11 @@
 	if (!vcpu->rmode.active)
 		return 0;
 
-	if (vec == GP_VECTOR && err_code == 0)
+	/*
+	 * Instruction with address size override prefix opcode 0x67
+	 * Cause the #SS fault with 0 error code in VM86 mode.
+	 */
+	if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
 		if (emulate_instruction(vcpu, NULL, 0, 0) == EMULATE_DONE)
 			return 1;
 	return 0;