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Re: [Xen-devel] [PATCH] AMD IOMMU: Defer IO pagetable construction until device assignment


  • To: Wei Wang2 <wei.wang2@xxxxxxx>
  • From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
  • Date: Wed, 02 Apr 2008 16:26:40 +0100
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Wed, 02 Apr 2008 08:28:35 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AciU1fKmMQDs3wDJEd2zswAX8io7RQ==
  • Thread-topic: [Xen-devel] [PATCH] AMD IOMMU: Defer IO pagetable construction until device assignment



On 2/4/08 16:25, "Wei Wang2" <wei.wang2@xxxxxxx> wrote:

>> I think you should leave p2m.c as it is, and then synchronise on creation of
>> the iommu tables from within amd_iommu_map_page(). You already have a
>> mapping_lock in there which might do the trick.
> I will update it. Maybe I need a new flag to indicate that I/O page tables has
> been synchronised..

Set and checked under the mapping lock. Yes, that would indeed work.

 -- Keir



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