Quoting r. Kristen Accardi <[email protected]>:
> I guess the assumption I made was that if msi is
> turned off for a bridge, then all devices under the bridge may not use
> msi.
Well, all this is just quirks, so no real rules apply, thats why I thought
having 2 bits gives us maximum flexibility.
Specifically for PCXH I see this in code:
/*
* It's possible for the MSI to get corrupted if shpc and acpi
* are used together on certain PXH-based systems.
* */
So it seems the issue is device-specific - only affects the bridge itself.
What the code currently does is disable msi for bridge itself but not for
the devices behind it. I cant inherit dev->no_msi from parent to child
without changing this, and I just assumed this is by design.
Are you saying this is a bug and should be changed?
--
Michael S. Tsirkin
Staff Engineer, Mellanox Technologies
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