Re: [PATCH 0/5] xen: cleanup detection of non-essential pv devices

[Juergen Gross <jgross@xxxxxxxx>]

On 22.10.21 09:24, Jan Beulich wrote:
> On 22.10.2021 08:47, Juergen Gross wrote:
> > Today the non-essential pv devices are hard coded in the xenbus driver
> > and this list is lacking multiple entries.
> >
> > This series reworks the detection logic of non-essential devices by
> > adding a flag for that purpose to struct xenbus_driver.
> I'm wondering whether it wouldn't better be the other way around: The
> (hopefully few) essential ones get flagged, thus also making it more
> prominent during patch review that a flag gets added (and justification
> provided), instead of having to spot the lack of a flag getting set.
Not flagging a non-essential one is less problematic than not flagging
an essential driver IMO.

For some drivers I'm on the edge, BTW. The pv 9pfs driver ought to be
non-essential in most cases, but there might be use cases where it is
needed, so I didn't set its non_essential flag.

Same applies to pv-usb and maybe pv-scsi, while pv-tpm probably really
is essential.

With the current series I'm ending up with 6 non-essential drivers and
6 essential ones, so either way needs the same number of drivers
modified.


Juergen

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