Re: [PATCH 2/2] xen/dm: arm: Introduce inject_msi2 DM op

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 24 Jan 2024, Andrew Cooper wrote:
> On 24/01/2024 1:07 am, Stefano Stabellini wrote:
> >> I agree with Jan that we could reuse
> >> xendevicemodel_inject_msi by assuing that PCI BDF zero is invalid.
> 
> I've already explained why that will break future x86.  (See the other
> thread off this patch for specifics).
> 
> When we add vIOMMUs to guests, we *must* have correct source ids.  0 is
> ambiguous, so not safe to reuse.
> 
> 
> Allocating a new subop now is the only way to not shoot in the foot later.

OK, what you wrote makes sense to me.