Re: [PATCH 1/1] iommu/amd: Fix PASID format in INVALIDATE_IOTLB_PAGES command

[Suravee Suthikulpanit]

On 3/4/2014 8:12 AM, Joerg Roedel wrote:
> On Wed, Feb 26, 2014 at 03:49:31PM -0600, suravee.suthikulpanit@xxxxxxx wrote:
> > From: Jay Cornwall <jay.cornwall@xxxxxxx>
> >
> > This patch corrects the PASID format in the INVALIDATE_IOTLB_PAGES
> > command, which was caused by incorrect information in
> > the AMD IOMMU Architectural Specification v2.01 document.
> >
> >      Incorrect format:
> >           cmd->data[0][16:23] = PASID[7:0]
> >           cmd->data[1][16:27] = PASID[19:8]
> >
> >       Correct format:
> >           cmd->data[0][16:23] = PASID[15:8]
> >           cmd->data[1][16:23] = PASID[7:0]
> >
> > However, this does not affect the IOMMUv2 hardware implementation,
> > and has been corrected since version 2.02 of the specification
> > (available through AMD NDA).
> >
> > Signed-off-by: Jay Cornwall <jay.cornwall@xxxxxxx>
> > Reviewed-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
>
> Applied, thanks.
>
> Does this mean that PASIDs are only 16 bits wide now from the former 20
> bits?

Thank you Joerg. The specification also state that this command format 
does not support the maximum size of the PASID field. However, other 
commands seem to still support 20-bit PASID.

Suravee

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