[Xen-changelog] [xen-unstable] Fix #GPF injection into compat guests in vm86 code

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1277917963 -3600
# Node ID fae04060a4f4e364c5012692b97ae1eeec3a326e
# Parent  7cda3ad44c6d4e799e65b2ffe21e609f50cdb94b
Fix #GPF injection into compat guests in vm86 code

not to let the guest disable interrupts in the real EFLAGS.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/x86/x86_64/compat/traps.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff -r 7cda3ad44c6d -r fae04060a4f4 xen/arch/x86/x86_64/compat/traps.c
--- a/xen/arch/x86/x86_64/compat/traps.c        Wed Jun 30 18:11:42 2010 +0100
+++ b/xen/arch/x86/x86_64/compat/traps.c        Wed Jun 30 18:12:43 2010 +0100
@@ -127,9 +127,8 @@ unsigned int compat_iret(void)
         ti = &v->arch.guest_context.trap_ctxt[13];
         if ( TI_GET_IF(ti) )
             eflags &= ~X86_EFLAGS_IF;
-        regs->_eflags = eflags & ~(X86_EFLAGS_VM|X86_EFLAGS_RF|
-                                   X86_EFLAGS_NT|X86_EFLAGS_TF);
-
+        regs->_eflags &= ~(X86_EFLAGS_VM|X86_EFLAGS_RF|
+                           X86_EFLAGS_NT|X86_EFLAGS_TF);
         if ( unlikely(__put_user(0, (u32 *)regs->rsp)) )
             goto exit_and_crash;
         regs->_eip = ti->address;

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