[Xen-changelog] [xen-3.0-testing] [XEN] IOPL is ignored for VM86 mode port accesses. Fix Xen

[Xen patchbot-3.0-testing <patchbot-3.0-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID d83290c8ad8dd56e445dc085d185f8c8f8975860
# Parent  25a84ad211ddb8206e3c36f238e7592d70460cfd
[XEN] IOPL is ignored for VM86 mode port accesses. Fix Xen
emulation to match native behaviour.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
xen-unstable changeset:   10309:5a0ed6c476732da229c3307ea5357cdd196e5462
xen-unstable date:        Fri Jun  9 14:29:00 2006 +0100
---
 xen/arch/x86/traps.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r 25a84ad211dd -r d83290c8ad8d xen/arch/x86/traps.c
--- a/xen/arch/x86/traps.c      Thu Jun 08 16:52:34 2006 +0100
+++ b/xen/arch/x86/traps.c      Fri Jun 09 14:50:44 2006 +0100
@@ -745,7 +745,8 @@ 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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