From: Jan Kiszka <jan.kiszka@siemens.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: Martin Wolf <mwolf@adiumentum.com>, kvm@vger.kernel.org
Subject: Re: vga passthrough // questions about pci passthrough
Date: Fri, 28 Sep 2012 10:12:22 +0200 [thread overview]
Message-ID: <50655BE6.9050305@siemens.com> (raw)
In-Reply-To: <1348773491.2320.217.camel@ul30vt.home>
On 2012-09-27 21:18, Alex Williamson wrote:
> On Thu, 2012-09-27 at 20:43 +0200, Martin Wolf wrote:
>> thank you for the information.
>>
>> i will try what you mentioned...
>> do you have some additional information about rebooting a VM with a
>> passed through videocard?
>> (amd / ati 7870)
>
> I don't. Is the bsod on reboot only or does it also happen on shutdown?
> There's a slim chance it could be traced by enabling debug in the
> pci-assign driver and analyzing what the guest driver is trying to do.
> I'm hoping that q35 chipset support might resolve some issues with vga
> assignment as it exposes a topology that looks a bit more like one that
> a driver would expect on physical hardware. Thanks,
>From our attempts to get more working than what NVIDIA Quadro cards
support officially, my own experiments with q35 in this context and our
discussions with NVIDIA, I'm pretty skeptical that this chipset will
make a difference here. Most problems are due to those non-standard side
channels to configure the hardware, memory mappings etc. And getting
this working requires either cooperation of the vendor or *a lot* of
reverse engineering.
Jan
--
Siemens AG, Corporate Technology, CT RTC ITP SDP-DE
Corporate Competence Center Embedded Linux
next prev parent reply other threads:[~2012-09-28 8:12 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-18 5:45 vga passthrough // questions about pci passthrough Martin Wolf
2012-07-18 9:26 ` Jan Kiszka
2012-07-18 12:08 ` Martin Wolf
2012-07-18 12:37 ` Martin Wolf
2012-07-18 14:23 ` Alex Williamson
2012-07-19 14:54 ` Martin Wolf
2012-07-19 16:13 ` Jan Kiszka
2012-07-19 16:16 ` Alex Williamson
2012-09-27 11:19 ` Martin Wolf
2012-09-27 17:56 ` Alex Williamson
2012-09-27 18:43 ` Martin Wolf
2012-09-27 19:18 ` Alex Williamson
2012-09-27 19:37 ` Martin Wolf
2012-09-27 20:46 ` Alex Williamson
2012-09-28 5:15 ` Martin Wolf
2012-09-28 8:12 ` Jan Kiszka [this message]
2012-09-28 14:45 ` Martin Wolf
2012-09-28 15:50 ` Alex Williamson
2012-09-28 16:29 ` Jan Kiszka
2012-10-02 8:22 ` Martin Wolf
2012-12-13 22:47 ` Erik Hardesty
2012-09-12 7:31 YunQiang Su
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