[coreboot] PCI passthrough on ASUS KGPE-D16
Taiidan at gmx.com
Taiidan at gmx.com
Thu Oct 6 05:59:05 CEST 2016
I would really love to find a legit answer Re: what chipsets/mobos
support gfx i/o fwd before I splash out hundreds of dollars.
AFIAK forwarding graphics devices requires a lot more special sauce than
regular pci devices (like network interfaces)
On my propitiatory-firmware intel laptop dmesg says
"DMAR: BIOS has allocated no shadow GTT; disabling IOMMU for graphics"
So apparently you need a shadow gart for it to work, something that is
above my paygrade.
It would be really great if there was an IOMMU/GFX bit on the coreboot
supported motherboards page as this is a common question that never
finds anything more than anecdotal evidence. I am grateful for your help
mike but running grep commands on the source files provides nothing more
than just that.
On 10/03/2016 07:09 PM, Mike Banon wrote:
> Correct me if I am wrong, but I think: IOMMU support means that a
> graphics card passthrough is possible (this is binary: IOMMU yes ==>
> possible / no ==> not possible). If IOMMU support is buggy (which
> seems to be commonly found with proprietary BIOS) maybe your system
> could experience some bugs while you are using this feature. Of course
> the most reliable way to find out is to try it, but I am pretty sure
> that coreboot's IOMMU support is good
> On Sun, Oct 2, 2016 at 9:04 PM, Zoran Stojsavljevic
> <zoran.stojsavljevic at gmail.com> wrote:
>>> Would it be possible to passthrough a graphics card to a virtual machine
>>> while using Coreboot/Libreboot?
>> Hello opteron/AMD supporter,
>> You did ask very (very, should say extremely) tricky question, you do know
>> this (I betcha you do, don't you)??? ;-)
>> On Sun, Oct 2, 2016 at 6:22 PM, <opteron at keemail.me> wrote:
>>> would it be possible to passthrough a graphics card to a virtual machine
>>> while using Coreboot/Libreboot? The libreboot website says that the
>>> motherboard offers full IOMMU-support when using a CPU from the Opteron
>>> 6200/6300 series.
>>> coreboot mailing list: coreboot at coreboot.org
>> coreboot mailing list: coreboot at coreboot.org
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