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.
>
> 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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