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RE: [Xen-devel] [PATCH 0/2] graphics passthrough with VT-d

To: 'Jean Guyader' <jean.guyader@xxxxxxxxxx>
Subject: RE: [Xen-devel] [PATCH 0/2] graphics passthrough with VT-d
From: "Han, Weidong" <weidong.han@xxxxxxxxx>
Date: Fri, 28 Aug 2009 16:32:01 +0800
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Thread-topic: [Xen-devel] [PATCH 0/2] graphics passthrough with VT-d
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. 

Cool. That's very useful.


>> The patchset is as follows:
>> 1. PATCH 1/2: changes in xen-unstable
>>      - retrieves VGA bios from host VGA BIOS address (0xC0000), then
>> load it to guest VGA BIOS address (This is the same with XCI). 
>>      - Enlarge guest MMIO range to contain gfx card's large memory
>>      - add a config option 'gfx_passthru' for gfx passthrough
>> 2. PATCH 2/2: changes in QEMU
>>      - disable emulated VGA adapter
>>      - register/unregister legacy VGA I/O ports and MMIOs
> Hi,
> Has those patch been tested with an intel IGD?
> Because I think they are some pieces missing:
>         - GMCH mapping in the guest.
>         - VID DID pt for the host bridge (for linux hvm guest).
>         - TOM pass through for winxp guest.
> Jean

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