Re: [Xen-devel] [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

> -----Original Message-----
> From: Gerd Hoffmann [mailto:kraxel@xxxxxxxxxx]
> Sent: Thursday, May 22, 2014 7:22 PM
> To: Chen, Tiejun
> Cc: Anthony PERARD; Daniel P. Berrange; peter.maydell@xxxxxxxxxx;
> xen-devel@xxxxxxxxxxxxxxxxxxx; mst@xxxxxxxxxx;
> stefano.stabellini@xxxxxxxxxxxxx; Kay, Allen M; Kelly.Zytaruk@xxxxxxx;
> qemu-devel@xxxxxxxxxx; Zhang, Yang Z; anthony@xxxxxxxxxxxxx
> Subject: Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve
> 00:02.0 for INTEL IGD
> 
>   Hi,
> 
> > After applied your patch, 'xen-platform' is always disabled by default, 
> > right?
> 
> Only in case -nodefaults is passed on the qemu command line (don't know
> whenever libxl does that).
> 
> > gfx_passthru=1
> > pci=["00:02.0@2", "00:1a.0"]
> > xen_platform_pci=0
>   ^^^^^^^^^^^^^^^^^^
> That line isn't needed ...

Yes, this can work after remove this line:

gfx_passthru=1
pci=["00:02.0@2", "00:1a.0"]
#xen_platform_pci=0
device_model_args_hvm = ['-device', 'xen-platform,addr=0x3']

Then domU has xen-platform again:

tchen0@tchen0-HVM-domU:~$ lspci
00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller 
(rev 06)
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen 
Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Unassigned class [ff80]: XenSource, Inc. Xen Platform Device (rev 01)
00:04.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family 
USB EHCI #2 (rev 04)
00:1f.0 ISA bridge: Intel Corporation Q87 Express LPC Controller (rev 04)

> 
> > device_model_args_hvm = ['-device', 'xen-platform,addr=0x3']
> 
> That alone should be enough to move away the platform device.
> 

Sure.

Thanks
Tiejun
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