On 13/03/18 01:53 PM, Sinan Kaya wrote:

I agree disabling globally would be bad. Somebody can always say I have
ten switches on my system. I want to do peer-to-peer on one switch only. Now,
this change weakened security for the other switches that I had no intention
with doing P2P.

Isn't this a problem?

Well, if it's a problem for someone they'll have to solve it. We're
targeting JBOFs that have no use for ACS / IOMMU groups at all.

Can we specify the BDF of the downstream device we want P2P with during boot via
kernel command line?

That's a painful configuration burden. And then things might stop
working if you change your topology at all and now have to change boot
parameters.

Logan