[Xen-changelog] [xen-unstable] [XEN] IOPL is ignored for VM86 mode port accesses. Fix Xen

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

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 5a0ed6c476732da229c3307ea5357cdd196e5462
# Parent  49f65e2b0f1c5b96326c764808e819af85e883d7
[XEN] IOPL is ignored for VM86 mode port accesses. Fix Xen
emulation to match native behaviour.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
---
 xen/arch/x86/traps.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r 49f65e2b0f1c -r 5a0ed6c47673 xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c      Fri Jun 09 14:25:46 2006 +0100
+++ b/xen/arch/x86/traps.c      Fri Jun 09 14:29:00 2006 +0100
@@ -748,7 +748,8 @@ static inline int guest_io_okay(
 #define TOGGLE_MODE() ((void)0)
 #endif
 
-    if ( v->arch.iopl >= (guest_kernel_mode(v, regs) ? 1 : 3) )
+    if ( !vm86_mode(regs) &&
+         (v->arch.iopl >= (guest_kernel_mode(v, regs) ? 1 : 3)) )
         return 1;
 
     if ( v->arch.iobmp_limit > (port + bytes) )

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