Re: [Xen-devel] [PATCH 1/1] x86/AMD: Fix setup ssss:bb:dd:f for d0 failed

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 07.08.13 at 11:34, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> On 07/08/13 03:40, suravee.suthikulpanit@xxxxxxx wrote:
>> From: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
>>
>> The host bridge device (i.e. 0x18 for AMD) does not
>> require IOMMU, and therefore is not included in the IVRS.
>> The current logic tries to map all PCI devices to an IOMMU. 
>> In this case, "xl dmesg" shows the following message on AMD sytem.
> 
> Can you elaborate on what you mean by "does not require IOMMU" ? How
> does anything behind the host bridges get translated if they are in the
> path of the IOMMU?

Iiuc it's the nature of a host bridge that what's behind it is the
host (and in particular no PCI devices), which doesn't require
IOMMU translation.

Jan


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