Re: [Xen-devel] Bug in x86 instruction emulator?

[wogiz@xxxxxxxxxxxxxxx]

On 2016-04-15 19:44, Andrew Cooper wrote:
> On 15/04/16 18:33, wogiz@xxxxxxxxxxxxxxx wrote:
> > On 2016-04-07 04:04, Jan Beulich wrote:
> > > We'd need to know which exact exception (including error code and,
> > > in the case of #PF, CR2 value) gets raised to the guest by what
> > > specific piece of code in the hypervisor. That'll likely mean some
> > > instrumentation of the hypervisor code.
> > >
> > > Jan
> > I want to give it a try, but I'm not sure how the hypervisor code
> > should be modified.
> >
> > Can anyone point me to some documentation or anything else that can
> > help me get started?
> Very sorry - I have been busy with patches intended for the 4.7 code 
> freeze.
> What domU are you using?  Is the issue reproducible from a LiveCD by 
> any
> chance?
>
> ~Andrew
No problem. I appreciate your help.

I'm using Alpine Linux 3.3.3 domU, but I have also tested various 
versions
of Ubuntu.

The issue is reproducible from LiveCD, both Alpine and Ubuntu.

The only requriements to reproduce the fault is a Linux HVM domU with 
vga="qxl"
and qxl driver installed in domU. Xorg will segfault instantly when 
started, no
matter what Linux distro or other configuration.

William Z.


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