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

To: "Han, Weidong" <weidong.han@xxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 0/2] graphics passthrough with VT-d
From: Andrew Lyon <andrew.lyon@xxxxxxxxx>
Date: Fri, 28 Aug 2009 10:04:28 +0100
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On Fri, Aug 28, 2009 at 8:53 AM, Han, Weidong<weidong.han@xxxxxxxxx> 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.

What about cheaper cards in the FX range like the FX580 or FX1800, are
they likely to be passthrough friendly?

Perhaps we should ask nvidia exactly which cards support
virtualization, or is it a feature that is listed in the tech specs?,
I could probably run to one of the cheaper FX cards but the high end
ones are way too expensive for me to justify the cost.


> 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.)
> 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
> Signed-off-by: Ben Lin <ben.y.lin@xxxxxxxxx>
> Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>
> _______________________________________________
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