Some questions about VGA passthrough

Some questions about VGA passthrough

[jocelyn.falempe]

Hi,

I'm trying get the following configuration working with Xen VGA passthrough (no more dual-boot for gaming !):

Core i7 3770 (with Vt-d)
ASRock z77 Pro4-M
Sapphire Radeon HD 7950

my goal is to have a Linux Dom0 using the intel HD 3000 gfx integrated in the CPU, connected to 1 display, and a Win7 DomU, using the Radeon 7950, connected to another display.

I installed Ubuntu 12.04, and xen 4.1.2 from the packages.

- Do I need VGA passthrough, or PCI passthrough might be enough in my case ? (Dom0 doesn't use the Radeon, and I saw some reports with 3D graphics with PCI passthrough).

- Do I need to extract the VGA Bios ? I think it is only required for NVIDA cards, but I didn't find a clear statement.

- Do I need to add vga passthrough patches ? which version to use for xen 4.1.2 ?

my xen is able to boot a HVM 64bit win8 consumer preview (but there are no driver for 7950, so I will go back to win7).

also I added this in grub :

GRUB_CMDLINE_LINUX="quiet splash xen-pciback.permissive xen-pciback.hide=(01:00.0)(01:00.1) pci=resource_alignment=01:00.0;01:00.1"

~# xm pci-list-assignable-device
0000:01:00.0
0000:01:00.1

so normally I should be able to pass the graphic cards to the HVM.

Any help greatly appreciated,

Regards,

-- 

Joc

Re: Some questions about VGA passthrough

[Jean Guyader]

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On 23 May 2012 19:18, <jocelyn.falempe@free.fr> wrote:

> Hi,
>
> I'm trying get the following configuration working with Xen VGA
> passthrough (no more dual-boot for gaming !):
>
> Core i7 3770 (with Vt-d)
> ASRock z77 Pro4-M
> Sapphire Radeon HD 7950
>
> my goal is to have a Linux Dom0 using the intel HD 3000 gfx integrated in
> the CPU, connected to 1 display, and a Win7 DomU, using the Radeon 7950,
> connected to another display.
>
> I installed Ubuntu 12.04, and xen 4.1.2 from the packages.
>
> - Do I need VGA passthrough, or PCI passthrough might be enough in my case
> ? (Dom0 doesn't use the Radeon, and I saw some reports with 3D graphics
> with PCI passthrough).
>
> - Do I need to extract the VGA Bios ? I think it is only required for
> NVIDA cards, but I didn't find a clear statement.
>
> - Do I need to add vga passthrough patches ? which version to use for xen
> 4.1.2 ?
>
> my xen is able to boot a HVM 64bit win8 consumer preview (but there are no
> driver for 7950, so I will go back to win7).
>
> also I added this in grub :
>
> GRUB_CMDLINE_LINUX="quiet splash xen-pciback.permissive
> xen-pciback.hide=(01:00.0)(01:00.1) pci=resource_alignment=01:00.0;01:00.1"
>
> ~# xm pci-list-assignable-device
> 0000:01:00.0
> 0000:01:00.1
>
> so normally I should be able to pass the graphic cards to the HVM.
>
> Any help greatly appreciated,
>
> Regards,


PCI passthrough will be enough. VGA passthrough is used when you want to
pass through a primary display adapter and have VGA/VESA working in the
guest.

Jean

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Re: Some questions about VGA passthrough

[jocelyn.falempe]

Thanks for the clarification.
PCI passthrough should be easier to setup.

Regards,

-- 

Joc