[vfio-users] vfio-pci disable_vga but still t rying to switch....

[Quentin Deldycke]

Hello,

I want to be able to use:

   - r9 290 on vm using vfio (actually working)
   - intel graphic card on host
   - another amd card (but rather old, different the r9 290) on host (to at
   least, if it work, change it to a nvidia card who support hdmi 2.0)

My problem is that when i boot, the vga arb is making the combo intel / old
radeon buggy: no dri2, so no dri-prime also. I wanted to avoid i915
patch... But this state is present even before the vm is booted (note that
it use ovmf pure efi).


I made quite a lot of tries. and it seems the intel card can't boot on
uefi. (when i disable csm or move csm to uefi only, the intel card simply
disapear from lspci (and thus, the r9 is used)

--
Deldycke Quentin


On 12 March 2016 at 16:25, Alex Williamson <alex.l.williamson at gmail.com>
wrote:

> On Sat, Mar 12, 2016 at 8:13 AM, Quentin Deldycke <
> quentindeldycke at gmail.com> wrote:
>
>> Hello,
>>
>> I wanted to disable CSM on my computer (asrock extreme 6)
>>
>
> Let's start here, what do you hope to accomplish by disabling CSM on the
> host system?  Host CSM/VGA usage has no bearing on the vfio-pci.disable_vga
> parameter.  That option simply disables VGA space access to the device
> through vfio and therefore opts out of VGA arbitration.  Perhaps you're
> reading more into the option than is necessary.  Thanks,
>
> Alex
>
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