[PATCH] svm: Avoid VINTR injection during NMI shadow

[Wei Wang2 <wei.wang2@amd.com>]

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Hi,
I had observed that if xen injects and intercepts VINTR during NMI shadow, and 
if the xen injects NMI into guest at a very hight frequency, guest vcpu will 
hang. Attached patch avoids VINTR injection when guest is handling a NMI.

Thanks,

Wei
Signed-off-by: Wei Wang <wei.wang2@amd.com>
Reviewed-by: Wei Huang<wei.huang2@amd.com>
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diff -r e6f751ed8e38 xen/arch/x86/hvm/svm/intr.c
--- a/xen/arch/x86/hvm/svm/intr.c	Tue Mar 09 10:00:37 2010 +0000
+++ b/xen/arch/x86/hvm/svm/intr.c	Fri May 07 16:15:58 2010 +0200
@@ -92,6 +92,10 @@ static void enable_intr_window(struct vc
      * track 'NMI blocking' from NMI injection until IRET. This can be done
      * quite easily in software by intercepting the unblocking IRET.
      */
+
+    if ( vmcb->general1_intercepts & GENERAL1_INTERCEPT_IRET )
+        return;
+
     intr = vmcb->vintr;
     intr.fields.irq     = 1;
     intr.fields.vector  = 0;

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