From: Nitin A Kamble <nitin.a.kamble@intel.com>
Date: Thu, 17 May 2007 12:50:34 +0000 (+0300)
Subject: KVM: VMX: Handle #SS faults from real mode
X-Git-Tag: v2.6.23-rc1~520^2~56
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b3f37707b05e9ce82d5bec660e9d0b15452ee9a0;p=linux-2.6

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>
---

diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c
index c4c553588a..a05bfa0858 100644
--- a/drivers/kvm/vmx.c
+++ b/drivers/kvm/vmx.c
@@ -1488,7 +1488,11 @@ static int handle_rmode_exception(struct kvm_vcpu *vcpu,
 	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;