Re: [Xen-devel] [PATCH] libxl: Remove qxl support for the 4.3 release

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 18.09.13 at 17:26, Fabio Fantoni <fabio.fantoni@xxxxxxx> wrote:
> Il 18/09/2013 16:30, Jan Beulich ha scritto:
>>>>> On 18.09.13 at 16:12, Fabio Fantoni <fabio.fantoni@xxxxxxx> wrote:
>>> Il 18/09/2013 14:42, Jan Beulich ha scritto:
>>>>>>> On 18.09.13 at 14:29, Fabio Fantoni <fabio.fantoni@xxxxxxx> wrote:
>>>>> I not see the MMIO error on logs, what must I do to see it or any
>>>>> similar debug information?
>>>>> Tell me if I must do other specific test or you need other details.
>>>> Without the patch you ought to have seen "bad mmio size ..."
>>> I was unable to see the MMIO error on each log files also before the patch.
>>> I don't know if I have enable sufficent debug to log them.
>>> And I have no ideaon how to do it.
>> This is a guest warning (from log level perspective), so by default
>> would be visible in a rate limited fashion. If you want to be certain,
>> just add "loglvl=all guest_loglvl=all". But I'm more and more
>> convinced that the information we got from you originally was
>> misleading.
> 
> On grub.cfg now I have:
> ...
> multiboot       /boot/xen.gz placeholder dom0_mem=4G,max:4G loglvl=all 
> guest_loglvl=all
> ...
> But I'm unable to see debug related information in log files.

Log files? There can be a pertinent log file only if you have some
daemon running transferring the hypervisor log into a log file.
Otherwise you need to look at "xl dmesg" output.

> This was the test of Anthony Perard with all details about the problem:
> http://lists.xen.org/archives/html/xen-devel/2013-05/msg02050.html 

See the "bad mmio size 16" and "MMIO emulation failed @ ..."
messages there?

> So my questions are:
> - Is your patch aimed to completely solve cpus instrictions with MMIO 
> operands > 8 byte or
> - does it need also some qemu changes?

The patch is aiming at completely solving the in-hypervisor
emulation issues with operands of more than 8 bytes in size.

Whether on top of that a qemu change is also necessary I
don't know, but I wouldn't have expected so.

Jan


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