On Wed, Jul 01, 2020 at 08:30:07PM +0800, Jason Wang wrote:
> > I overlooked myself that the IR region will be there even if ir=off.
> Yes, but the point stands still but the issue is still if ir=off.
> >    So I
> > think the assert should stand.
> Do you mean vhost can't trigger the assert()? If yes, I don't get how it
> can't.

Yes.  vhost can only trigger the translate() via memory API.  No matter whether
ir is on/off, the memory region is always enabled, so any access to 0xfeexxxxx
from memory API should still land at s->mr_ir, afaict, rather than the dmar 

Peter Xu

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