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Re: [vfio-users] Supermicro C7Z170-OCE, a rather interesing Skylake Motherboard for VFIO if PEX8747 downstream ACS works



On Fri, Dec 25, 2015 at 5:49 PM, Zir Blazer <zir_blazer hotmail com> wrote:

So basically, I would like someone to confirm if PEX8747 ACS support works downstream, even on Intel consumer platforms.

No.  Whether or not a PCIe switch supports ACS is irrelevant when it's placed in a configuration downstream of a PCIe root port that does not support ACS.  The entire path from the endpoint to the IOMMU must support ACS in order for devices to be isolated.

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