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Re: [Xen-devel] [PATCH v7 2/4] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m

To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date: Tue, 20 May 2014 09:51:40 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Julien Grall <julien.grall@xxxxxxxxxx>, tim@xxxxxxx, stefano.stabellini@xxxxxxxxxx
Delivery-date: Tue, 20 May 2014 08:51:48 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

On Tue, 2014-05-20 at 09:30 +0200, Roger Pau MonnÃ wrote:
> Not sure I'm following what's going on here, are you saying that FreeBSD
> blkfront uses the same grant ref on two (or more) requests at the same time?

My understanding was that there were two grant refs to the same mfn,
which could happen if two threads were doing (direct?) IO to buffers
which happened to lie on the same page, or with aio etc.

Ian.

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Follow-Ups:
- Re: [Xen-devel] [PATCH v7 2/4] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m
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References:
- [Xen-devel] [PATCH v7 0/4] IOMMU support for ARM
  - From: Julien Grall
- [Xen-devel] [PATCH v7 2/4] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m
  - From: Julien Grall
- Re: [Xen-devel] [PATCH v7 2/4] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m
  - From: Julien Grall
- Re: [Xen-devel] [PATCH v7 2/4] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m
  - From: Ian Campbell
- Re: [Xen-devel] [PATCH v7 2/4] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m
  - From: Julien Grall
- Re: [Xen-devel] [PATCH v7 2/4] xen/arm: grant: Add another entry to map MFN 1:1 in dom0 p2m
  - From: Roger Pau MonnÃ

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