[fedora-virt] AMD-Vi: Disabling interrupt remapping due to BIOS Bug(s) and Fedora 19 Virt Test Day (VFIO) question

[Alex Williamson]

On Mon, 2013-05-27 at 19:57 -0300, Reartes Guillermo wrote:
> Hi,
> 
> Since some time i get:
> 
> [    0.119059] [Firmware Bug]: AMD-Vi: IOAPIC[7] not in IVRS table
> [    0.119102] [Firmware Bug]: AMD-Vi: IOAPIC[8] not in IVRS table
> [    0.119143] [Firmware Bug]: AMD-Vi: No southbridge IOAPIC found in IVRS table
> [    0.119184] AMD-Vi: Disabling interrupt remapping due to BIOS Bug(s)
> [    1.928705] AMD-Vi: Found IOMMU at 0000:00:00.2 cap 0x40
> [    1.928923] AMD-Vi: Initialized for Passthrough Mode
> 
> Does these messages impede "Device assignment with VFIO" testing?
> 
> My mobo is a Asus Sabertooth 990FX 1.0, there is some discussion on the forum:
> 
> http://vip.asus.com/forum/view.aspx?id=20130227151715143&board_id=1&model=SABERTOOTH+990FX&page=1&SLanguage=en-us
> 
> I tried to assign a pcie Ethernet card about a year ago (no vfio) and
> the result was a lockup.
> I have not tried ever since.

If AMD-Vi is initialized w/o interrupt remapping, but otherwise works,
use the allow_unsafe_interrupts=1 module option to vfio_iommu_type1.
Thanks,

Alex