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Re: [Qemu-devel] [PATCH] vfio: Align iova also to IOMMU page size
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From: |
Pavel Fedin |
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Subject: |
Re: [Qemu-devel] [PATCH] vfio: Align iova also to IOMMU page size |
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Date: |
Wed, 25 Nov 2015 10:00:40 +0300 |
Hello!
> There are a number of different interesting page sizes here:
> * the host kernel page size
> * the target CPU architecture's worst-case smallest page size
> * the page size the guest kernel is actually using at the moment
> (consider a 4K-page guest kernel on a 64K-page host kernel)
>
> These don't necessarily have to all be the same. I would
> expect VFIO to be interested in the host kernel page size,
> not TARGET_PAGE_ALIGN.
So would the appropriate fix be just replacing TARGET_PAGE_ALIGN with
HOST_PAGE_ALIGN?
Alex: there's however, still no answer to "why are we aligning up, not down?"
question..
Kind regards,
Pavel Fedin
Expert Engineer
Samsung Electronics Research center Russia