On 11/19/2018 12:41 PM, Keith Busch wrote:

quoted

Still, breaking existing systems that rely on HEST table is not cool.
I'd rather have users specify "pcie_ports=native" to skip FF rather than
having broken systems by default to be honest.

The pcie_ports=native work-around ignores FF to potentially unknown
results, though.

How about being able to enable/disable FF in BIOS?

We can't really turn off firmware first in the kernel without asking help
from the firmware. Like you said, it causes unpredictable results.

There will be two competing software trying to touch the same registers.