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

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.


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


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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