Re: kvm-18 breaks Cisco VPN on WinXP SP1

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

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Leslie Mann wrote:
> FYI, a switch to rtl8139 from the default NE2000 nic has "cured" the problem
> under both kvm-18 and kvm-svn.
>   

The hint finally sank in, I was able to reproduce after switching to 
ne2k (I usually use rtl8139).  The attached patch (for kvm-18) fixes it 
for me.  Confirmation would be appreciated.

-- 
error compiling committee.c: too many arguments to function


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diff --git a/kernel/kvm_main.c b/kernel/kvm_main.c
index 3e06c56..11a3cab 100644
--- a/kernel/kvm_main.c
+++ b/kernel/kvm_main.c
@@ -1729,6 +1729,11 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
 		return 0;
 	}
 
+	if (!count) {
+		kvm_arch_ops->skip_emulated_instruction(vcpu);
+		return 1;
+	}
+
 	now = min(count, PAGE_SIZE / size);
 
 	if (!down)

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