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Re: [Xen-devel] Code 12 with VGA passthrough, even with qemu-traditional

On Fri, Aug 22, 2014 at 12:25:08PM +0100, Peter Kay wrote:
> On 21 August 2014 23:42:13 BST, Richie <listmail@xxxxxxxxxxxx> wrote:
> On 8/21/2014 6:01 PM, Sander Eikelenboom wrote:
> I have a system (amd based) with radeon HD6950 that is able to be 
> passed through to a linux HVM guest (although you only get output 
> after the kernel loads the radeon KMS/DRM driver since it's secondary
> passthrough). This is _not_ the primary graphics card from the host 
> (got another radeon for dom0).
> Just chiming in here with a side note.
> I decided to test out KVM + vfio on 3.16 with acs + intel igd patches 
> and passed through my secondary card. It was successful
> ...snip...
> Now to be clear, I am partial to Xen. My thinking is that at some 
> point (or perhaps even now) that using the qemu upstream device model 
> with Xen will yield this type of capability. 
> Hopefully the VGA passthrough will improve on Xen (non VGA passthrough is 
> fine). I'm curious too as to whether Xen could use VFIO at some point - 
> there's been a lot of work to decouple it from KVM and remove assumptions 
> about PC architecture (like Xen, KVM is busily supporting ARM).
> Would it be possible or do licensing/coding issues apply?

No license issues. The issues that exists are just bugs.
There are some issues in QEMU that make passthrough with
radeon and intel cards a bit iffy.
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