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Re: [Qemu-devel] [PATCH qemu v14 15/18] vfio: Add host side IOMMU capabi

From: Alexey Kardashevskiy
Subject: Re: [Qemu-devel] [PATCH qemu v14 15/18] vfio: Add host side IOMMU capabilities
Date: Tue, 22 Mar 2016 17:47:51 +1100
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.7.0

On 03/22/2016 03:20 PM, David Gibson wrote:
On Mon, Mar 21, 2016 at 06:47:03PM +1100, Alexey Kardashevskiy wrote:
There are going to be multiple IOMMUs per a container. This moves
the single host IOMMU parameter set to a list of VFIOHostIOMMU.

This should cause no behavioral change and will be used later by
the SPAPR TCE IOMMU v2 which will also add a vfio_host_iommu_del() helper.

Signed-off-by: Alexey Kardashevskiy <address@hidden>

This looks ok except for the name.  Calling each window a separate
"host IOMMU" is misleading.  The different windows the container
supports might be implemented by different IOMMUs on the host side, or
it might be implemented by one IOMMU with multiple tables.

Better to call them host DMA windows, or maybe container DMA windows.

VFIOHostDMAWindow it is then.


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