Re: [Xen-devel] [early RFC] ARM PCI Passthrough design document

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Wed, Feb 01, 2017 at 07:04:43PM +0000, Julien Grall wrote:
> Or maybe we could avoid mapping the doorbell in the guest and let Xen
> receive an SMMU abort. When receiving the SMMU abort, Xen could sanitize the
> value and write into the real MSI doorbell. Not sure if it would works
> thought.

AFAIK (and I might be wrong) you can only know the address that caused the
fault, but not the data that was attempted to be written there. TBH, I wouldn't
expect this approach to work.

Roger.

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