On 2020/7/1 下午8:41, Peter Xu wrote:
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
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 



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