Re: Windows PV driver for KVM

[Dor Laor <dor.laor@qumranet.com>]

On Wed, 2008-05-07 at 21:17 +0800, Jiang, Yunhong wrote:
> Avi Kivity <mailto:avi@qumranet.com> wrote:
> > Jiang, Yunhong wrote:
> >> I noticed there is a windows PV driver based on virtIO in
> >> http://sourceforge.net/project/showfiles.php?group_id=180599
> >> 
> >> But when I enable the driver in guest, the guest will hang. I'm using
> >> changeset around April, 18. Since the driver is created in March, I
> >> assume the changeset in Apri should be ok.
> >> 
> >> Are there any special action needed to enable the PV driver in
> windows?
> >> Have anyone tried it recently?
> >> 
> > 
> > We are using it in production.  What HAL is the guest using?  Are you
> > running with smp? 
> 
> The HAL is ACPI multipprocessor PC. 
> It is a UP guest. But I do notice one thing strange. When I use device
> manager->Processors, I see a lot of CPU listed. But it is really a UP
> system and I can only get one cpu in the task manager->performance
> window. Not sure if that's the reason of the hang.
> 

We just fixed an smp bug for virtio (also triggered by single processor
with ACPI multiprocessor HAL). We'll publish a new binary tomorrow.

The reason you see multiple cpus although there is only one is that we
expose the maximum number in the bios. The system is actually uses the
required number so this behavior is ok.


> -- Yunhong Jiang
> 
> > 
> > --
> > Any sufficiently difficult bug is indistinguishable from a feature.
> 
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