[Xen-devel] Re: IOMMU support for xen in BIOS of AMD based HP DL385g7 and kernel 3.0.0-rc7

["M. Schneider" <ms@xxxxxxxxxxxxxxxxxxxxxx>]

Am 20.07.2011 14:45, schrieb Roedel, Joerg:
> On Sun, Jul 17, 2011 at 06:34:33AM -0400, M. Schneider wrote:
>    
> > Please allow me one question about IOMMU support in AMDS's 890FX chipset
> > and 6176SE CPUs used in HP DL385g7 servers. These chips support IOMMU as
> > far as I know. BIOS of HP DL385g7 doesn't currently offer an IOMMU flag.
> >
> > I have contacted already HP support due to this missing BIOS setting
> > options but less or more my request has been ignored (no solution and no
> > plans for solving of this important issue  yet) so I am looking for a
> > workaround as IOMMU support is required for passing thoruhg of PCI
> > devices to domU domains (xen 4.0 / 4.1).
> >      
> I am sorry but if there is no IVRS table there is not much we can do.
> The IVRS table contains the information which device uses which
> request-ids. Without this information the IOMMU can not work reliably.
>    
Thank you very much fo your answer Jörg.

Some BIOSes (like BIOS of HD DL385g7 server with AMD CPUs) don't have 
the IOMMU option.
I have to correct my prevoius email as HP DL385g7 servers have the AMD 
SR5690/SP5100 chipset (supporting IOMMU).
Is it possible to write a workaround for xen 4.1 or 4.2 to create such 
IVRS table in code (in case it has static entries for specific server 
type) and add a boot option like "iommu=force-dl385g7" ?
Thank you in advance for any hints.

Best regards,
Mark

--
IT-Infrastrukturen Schneider

Wieslergasse 6
CH-8049 Zürich

Phone:  +41 43 818 4508
Mobile: +41 76 522 2923

ms@xxxxxxxxxxxxxxxxxxxxxx
http://www.it-infrastrukturen.com


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel