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Re: [Qemu-devel] [PATCH v2] vfio: Add support for mmapping sub-page MMIO
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] [PATCH v2] vfio: Add support for mmapping sub-page MMIO BARs |
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Date: |
Fri, 30 Sep 2016 18:05:55 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 |
On 14/09/2016 00:55, Alex Williamson wrote:
> Paolo, as the reigning memory API expert, do you see any issues with
> this? Expanding the size of a container MemoryRegion and the contained
> mmap'd subregion and manipulating priorities so that we don't interfere
> with other MemoryRegions.
I guess it's fine if you are okay with maintaining it.
memory_region_set_size exists, might as well use it. :)
What I'm worried about, is what happens if two such regions end up in
the same guest page. Then the two priorities conflict.
Paolo