Messages in this thread | | | From | Feng Kan <> | Date | Tue, 18 Jul 2017 22:37:00 -0700 | Subject | Re: [PATCH] pci: quirk: Apply APM ACS quirk to XGene devices |
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> > I don't know what that means, does the hardware support an equivalent > to source validation or not?
Yes, source validation is done through the smmu.
What's the response of the root port if > the downstream device issues a transaction spoofing devices not within > the bus number ranges of the bridge? HW guys informs me there is way to disable transactions between root port. I will confirm later.
> >> Alex, the goal here is to enable virtualization to work correctly. >> Please let me know if the >> above is sufficient. Much thanks. > > Of course, but that means that the hardware vendor is vouching that > this device provides the equivalent isolation for each of the missing > components of ACS. Claiming to have isolation capabilities that don't > exist would be irresponsible and put users of that hardware at risk. Agreed, I believe we do have isolation in our case based on the conference we had today.
> Thanks, > > Alex
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