Re: [Qemu-devel] [RFC PATCH] vfio: VFIO PCI driver for Qemu

[Andreas Hartmann <andihartmann@01019freenet.de>]

Alex Williamson wrote:

[I removed qemu-devel because I'm not registered there]

> On Thu, 2012-07-26 at 19:40 +0300, Avi Kivity wrote:
>> On 07/26/2012 07:33 PM, Alex Williamson wrote:
>>>>
>>>> In the common case, on x86 (but I'm repeating myself), the iommu group
>>>> includes just one device, yes?  Could we make pci-stub an alias for the
>>>> corresponding vfio steps?
>>>
>>> PCI bridges masking devices is not as uncommon as you'd like, that's
>>> exactly why Andreas is using VFIO instead of KVM assignment.  
>>
>> Well, we are using it in production for quite a while with few such reports.
>
> In the enterprise space, sure.  In the hobbiest/power user space, I
> suspect users are too often finding that it doesn't work and move on to
> something else.  Maybe we'll know if it's working better if we get more
> complaints about random oddball devices not working because people are
> actually able to get far enough to try it.

I think it's the complete 900-chipset series of AMD (990FX, 990X [the
one I'm using] and 970 - Socket AM3+), which provides the desktop user
with payable IOMMU support (e.g.
http://www.gigabyte.us/products/list.aspx?s=42&jid=7&p=2&v=26 ). I
already read from other users having the same problem.



Thanks,
kind regards,
Andreas