Re: [Xen-devel] [PATCH 3/3] xen: expose that grant table mappings update the IOMMU

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2014-04-07 at 18:02 +0200, Roger Pau Monne wrote:
> Add a new XENFEAT_hvm_gntmap_supports_iommu that is used to check
> whether the hypervisor properly updates the IOMMU on auto-translated
> guests when doing a grant table map/unmap operation.

Is it the case on x86 that all devices are behind the IOMMU?

On ARM with have the issue that only a subset of peripherals are behind
the IOMMU, for the rest we need other tricks like 1:1 mappings and
swiotlb bouncing (for dom0 only, we just don't support passing these
devices thru to domU).

Just want to make sure you aren't going to trip over a similar issue on
x86 after this ABI has been set...

Ian.


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