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Re: [PATCH v3 1/2] spapr: Disable legacy virtio devices for pseries-5.0


From: Michael S. Tsirkin
Subject: Re: [PATCH v3 1/2] spapr: Disable legacy virtio devices for pseries-5.0 and later
Date: Wed, 11 Mar 2020 03:11:16 -0400

On Wed, Mar 11, 2020 at 11:58:57AM +1100, David Gibson wrote:
> Note that several things that I believe are now in the PCIe spec, but
> really derive more from PC legacy considerations, don't apply at all
> for PAPR.  e.g. there's no meaningful distinction between integrated
> and slotted devices, multiple independent host bridges is routine and
> doesn't require any (virtual) hardware visible domain numbers.

Domain numbers are a Linux thing, not a PCIe thing. On x86 they come
from ACPI segment numbers. As such they aren't usually hardware
visible on x86, they are supplied by firmware.

-- 
MST




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