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Re: [Xen-devel] IOMMU issue on HP DL385g7 servers - workaround_bogus_bio

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Subject: Re: [Xen-devel] IOMMU issue on HP DL385g7 servers - workaround_bogus_bios / workaround_bug_bios doesn't help
From: Wei Wang2 <wei.wang2@xxxxxxx>
Date: Thu, 14 Jul 2011 18:27:41 +0200
Cc: Mark Schneider <ms@xxxxxxxxxxxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
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Wednesday 13 July 2011 16:05:54 Mark Schneider wrote:
> Hello,
> I have cretaed wheezy xen 4.1 debian live image (s. the link below to
> it) but even I tried different boot options like "iommu=1 |
> workaround_bios_bug | workaround_bogus_bios" I am getting such entry
> "(XEN) AMD-Vi: IOMMU not found!" in the log (s. for more details in
> http://www.it-infrastrukturen.com/fileadmin/linux/paste/xm_dmesg.xen41_on_D
>L385g7_NOK.txt )
> link to xen 4.0 (squeeze) and xen 4.1 (wheezy) debian live images -
> http://www.it-infrastrukturen.com/fileadmin/linux/debian-live-xen/README.xe
> do you have any idea how to solve this issue? - thank you in advance for
> any hints (different one than killing the hardware vendor (HP) ;) ...
> for the missing IOMMU BIOS option
> Linux xen41dom0 2.6.39-2-amd64 #1 SMP Wed Jun 8 11:01:04 UTC 2011 x86_64
> GNU/Linux
> Thank you in advance for any hints.
> Regards, Mark

workaround_bios_bug  and workaround_bogus_bios only works for vtd not amd.
You should have IVRS table build by BIOS to enable amd iommu. It could look 
like this:
(XEN) ACPI: IVRS AFE7C1ED, 00C8 (r1  AMD     RD890S  6040000 AMD         0)

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