Re: [Xen-devel] Fix VGA logdirty related display freezes with altp2m

[Tamas K Lengyel <tamas.k.lengyel@xxxxxxxxx>]

On Wed, Oct 24, 2018 at 11:20 AM Razvan Cojocaru
<rcojocaru@xxxxxxxxxxxxxxx> wrote:
>
> On 10/24/18 8:09 PM, Tamas K Lengyel wrote:
> > On Tue, Oct 23, 2018 at 6:37 AM Razvan Cojocaru
> > <rcojocaru@xxxxxxxxxxxxxxx> wrote:
> >>
> >> Tamas, could you please give this a spin?
> >>
> >> https://github.com/razvan-cojocaru/xen/tree/altp2m-logdirty-take2
> >>
> >> It _should_ solve the crashes.
> >
> > Indeed, I no longer see the crash. However, there might be some
> > locking issue present because the whole system freezes up shortly
> > after starting DRAKVUF on a domain - within a couple seconds. I mean
> > Xen itself locks up: no response on the serial, dom0 screen frozen,
> > etc.
>
> Do you have any type of log / backtrace / way I could reproduce it
> without Drakvuf? All the ways I've tested it were fine (including
> xen-access).

I don't have a standalone test that produces that error. With DRAKVUF
it is easily reproducible though. If you have a Windows guest
installed, setting up DRAKVUF should really not be much trouble. With
xen-access it indeed doesn't lock up but since the guest is pretty
much unresponsive during that test I can't verify whether the VGA
issue is now resolved or not. Also the xen-access tests are fairly
limited and don't use all aspects of altp2m.

Tamas

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