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Re: [Xen-devel] [PATCH 0/2] graphics passthrough with VT-d / keyboard an

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] [PATCH 0/2] graphics passthrough with VT-d / keyboard and mouse sharing patch
From: Jean Guyader <jean.guyader@xxxxxxxxx>
Date: Wed, 17 Mar 2010 15:42:55 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Lin, Ben Y" <ben.y.lin@xxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>, Jean Guyader <jean.guyader@xxxxxxxxxx>, "Han, Weidong" <weidong.han@xxxxxxxxx>, "bengheng@xxxxxxxxxxxxxx" <bengheng@xxxxxxxxxxxxxx>
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On 13 March 2010 00:37, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> On Fri, Aug 28, 2009 at 09:24:31AM +0100, Jean Guyader wrote:
>> On Fri, Aug 28, 2009 at 03:53:56AM -0400, Han, Weidong wrote:
>> > Hi all,
>> >
>> > Recently, more and more people are interesting in gfx passthrough. But now 
>> > xen-unstable doesn't support it, although some guys (Jean Guyader, Beng 
>> > Heng, Ng) posted gfx passthrough patches. If xen-unstable includes gfx 
>> > passthrough support, people can be easy to try it.
>> >
>> > gfx passthrough is more complicated than other PCI device passthrough such 
>> > as NIC, and is hard to use a generic approach for all gfx passthrough. But 
>> > there are some necessary changes for gfx passthrough:
>> >   1. disable emulated VGA adapter, instead use passthroughed gfx
>> >   2. load VGA bios of the gfx to guest
>> >   3. passthrough legacy VGA IO ports and MMIOs to guest
>> >
>> > This patchset implements above common changes. Based on the common 
>> > changes, we are investigating to support more gfx cards and guest OSs. We 
>> > will post the hacks in future.
>> >
>> > The patchset supports to passthrough the primary gfx and discrete gfx. 
>> > With the patchset, virtualization friendly gfx cards can be passthroughed 
>> > (e.g. Nvidia FX3800), IGD and many discrete gfx cards are not supported 
>> > yet.
>> >
>> > This is easy to use, the only difference from other PCI passthrough is to 
>> > add following lines to hvm configure file:
>> >
>> > #----------------------------------------------------------------------------------------
>> > # 0: no gfx passthru, 1: IGD passthru, 2: discrete gfx passthru, default 
>> > is 0
>> > gfx_passthru=2
>> >
>> > and also pls passthrough a USB controller for keyboard/mouse use in guest. 
>> > (Now there are some issues on USB controller passthrough with pv-ops dom0, 
>> > so currently prefer to use 2.6.18 dom0.)
>> >
>> Once we have those patch inside xen-unstable, I could commit the patch we 
>> have for XCI
>> to share the host keyboard/mouse with multiple vms.
> Hello,
> I just found this while going through the archives.
> Jean:
> I don't remember seeing this keyboard/mouse sharing patch..
> Can you send it now when xen-unstable has graphics passthru support?

Hi Pasi,

I didn't post the patch on the mailing list, and in XCI we changed the
way it was working.
When I will have some free time, I will right a more upstreamable version.


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