Re: [Xen-devel] [PATCH v2 3/4] amd-iommu: disable iommu_hap_pt_share with AMD IOMMUs

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.04.14 at 12:04, <roger.pau@xxxxxxxxxx> wrote:
> On 23/04/14 11:57, Jan Beulich wrote:
>>>>> On 23.04.14 at 10:16, <roger.pau@xxxxxxxxxx> wrote:
>>> According to the comment in p2m.h, AMD IOMMUs don't work correctly
>>> with page types different than p2m_ram_rw when the p2m is shared
>>> between HAP and IOMMU, so disable this sharing when using AMD IOMMUs.
>> 
>> Doesn't this need to go before patch 2?
> 
> It could certainly go before patch 2, but I don't see such a hard
> requirement in the ordering (either way AMD hardware needs both patches
> to work correctly, and applying one before the other is not going to
> break bisection AFAICT).

Patch 2 allows the high bits in present IOMMU entries to be non-zero,
thus allowing for IOMMU faults without this patch already in effect.

Jan


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