[Xen-changelog] [xen-unstable] x86 emulate: Emulate atomic read-modify-write instructions as a

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1196096277 0
# Node ID 4deb65519d9b2ff75a25631e9724593de5672bc9
# Parent  11bfa26dd1250a90e00f8537d060433e911bcd3b
x86 emulate: Emulate atomic read-modify-write instructions as a
straightforward write. Hopefully multiprocessor synchronisation is not
relied upon in real mode!
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/realmode.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff -r 11bfa26dd125 -r 4deb65519d9b xen/arch/x86/hvm/vmx/realmode.c
--- a/xen/arch/x86/hvm/vmx/realmode.c   Mon Nov 26 16:47:10 2007 +0000
+++ b/xen/arch/x86/hvm/vmx/realmode.c   Mon Nov 26 16:57:57 2007 +0000
@@ -237,7 +237,8 @@ realmode_emulate_cmpxchg(
     unsigned int bytes,
     struct x86_emulate_ctxt *ctxt)
 {
-    return X86EMUL_UNHANDLEABLE;
+    /* Fix this in case the guest is really relying on r-m-w atomicity. */
+    return realmode_emulate_write(seg, offset, new, bytes, ctxt);
 }
 
 static int

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