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Re: [Xen-devel] [Qemu-devel] [RFC][PATCH 1/1] libxl: add one machine property to support IGD GFX passthrough

On 2015/1/23 8:43, Chen, Tiejun wrote:
On 2015/1/22 8:51, Chen, Tiejun wrote:
On 2015/1/21 21:48, Gerd Hoffmann wrote:
On Mi, 2015-01-21 at 11:37 +0000, Ian Jackson wrote:
Tiejun Chen writes ("[RFC][PATCH 1/1] libxl: add one machine property
to support IGD GFX passthrough"):
When we're working to support IGD GFX passthrough with qemu
upstream, instead of "-gfx_passthru" we'd like to make that
a machine option, "-machine xxx,gfx_passthru=on". This need
to bring several changes on tool side.

Has the corresponding patch to qemu-upstream been accepted yet ?

I'd like to see a confirmation from the qemu side that this is going
into their tree and that the command-line option syntax has been

Suggested at patch review, not merged (guess thats why it is tagged
'rfc', to get both qemu+xen on the same page).

Yeah, this is exactly what I intended to do here :)

While being at it:  Should we name this 'igd-passthru' instead of
'gfx-passthru'?  The hostbridge / isabridge quirks needed are actually
specific to igd and are not needed for -- say -- nvidia gfx cards.

At this point I just concern here if we still use 'gfx_passthrou', at
least it may look like a backward compatibility with older versions of
qemu in Xen side, qemu-xen-traditional. But I'd like to follow your
final option.

Any feedback to this option I should follow here?



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