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

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi Roger,

On 02/02/17 15:40, Roger Pau Monné wrote:
> 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.
You are right, I got confused with the data abort path. So I guess there 
is no way to do secure MSI in this case :/
Cheers,

> Roger.
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