Re: Vista/rtl8139 broken?

["Daniel P. Berrange" <berrange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On Sun, Aug 19, 2007 at 12:31:14AM +0100, Alistair John Strachan wrote:
> Hi,
> 
> I've been using ne2k with BSD/Linux/WindowsXP just fine with 
> KVM-35/2.6.23-rc2, but when I try to run Vista, which doesn't support the 
> ne2k any more, I tried switching to the rtl8139 emulation.
> 
> I observed that the rtl8139 emulation works fine in WindowsXP, so it's not 
> broken. But it does not seem to work in Vista (x86). The host is AMD64/SVM. 
> The way that it doesn't work is that no packets are sent/received over the 
> interface, so the device does not route.
> 
> The only difference between XP and Vista's KVM startup is that for Vista I 
> enable ACPI (necessary to install).
> 
> WindowsXP -->
> kvm -no-reboot -localtime -no-acpi -m 256 -hda $IMAGE \
>     -net nic,model=rtl8139 -net tap,script=/etc/kvm/kvm-ifup $*
> 
> Vista -->
> kvm -no-reboot -localtime -m 512 -hda $IMAGE \
>     -net nic,model=rtl8139 -net tap,script=/etc/kvm/kvm-ifup $*
> 
> The problem seems to be similar to a QEMU endian bug from some time ago, but I 
> don't think that's the problem here. It looks like it's some sort of 
> incompatibility between Vista and the rtl8139 emulation.

The rtl8139 driver was fixed in upstream QEMU a week or two back - it was
calculating checksums incorrectly which Vista didn't like.  The patch needs
to be applied to KVM too...

Dan.
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