Re: [Xen-devel] Device Reset on Nvidia GPUs

[Gordan Bobic <gordan@xxxxxxxxxx>]

On Fri, 15 Nov 2013 14:27:21 +0000, Stefano Stabellini 
<stefano.stabellini@xxxxxxxxxxxxx> wrote:
> On Fri, 15 Nov 2013, Gordan Bobic wrote:
> > I've noticed that nouveau driver has a sysfs reset implemented
> > (although I'm not sure whether it is just a stub or whether it
> > does anything).
> >
> > Now, I fully understand that this is not actually necessary,
> > based purely on empirical evidence:
> >
> > My ATI cards reliably crash the host when the domU the are passed
> > to is rebooted, and the xen-pciback driver does have the sysfs
> > reset implemented for ATI cards.
> >
> > OTOH, my (modified) Nvidia cards handle domU reboots perfectly
> > and the xen-pciback driver has no sysfs reset implementation
> > for those.
> >
> > So I'm kind of torn between:
> > 1) It's not broken so don't even think about trying to fix it.
> > 2) Since FOSS reset implementation seems to exist, it might be
> > handy to port it into the xen-pciback feature list (caveat:
> > this may impact 1), which would be embarrasing).
> >
> > Thoughts?
> libxl is capable of using the sysfs reset node, so there shouldn't be
> any needed for porting the reset code to pciback
Not quite - when the device is owned by xen-pciback, there is
no reset node. When it is owned by nouveau, the reset node in
sysfs is there.

Gordan

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