Re: [PATCH v3 0/8] s390x/vfio-ccw: Channel Path Handling [KVM]

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On Fri, 17 Apr 2020 04:29:53 +0200
Eric Farman <farman@xxxxxxxxxxxxx> wrote:

> Here is a new pass at the channel-path handling code for vfio-ccw.
> Changes from previous versions are recorded in git notes for each patch.
> 
> I dropped the "Remove inline get_schid()" patch from this version.
> When I made the change suggested in v2, it seemed rather frivolous and
> better to just drop it for the time being.
> 
> I suspect that patches 5 and 7 would be better squashed together, but I
> have not done that here.  For future versions, I guess.

The result also might get a bit large.

> 
> With this, and the corresponding QEMU series (to be posted momentarily),
> applied I am able to configure off/on a CHPID (for example, by issuing
> "chchp -c 0/1 xx" on the host), and the guest is able to see both the
> events and reflect the updated path masks in its structures.

Basically, this looks good to me (modulo my comments).

One thing though that keeps coming up: do we need any kind of
serialization? Can there be any confusion from concurrent reads from
userspace, or are we sure that we always provide consistent data?




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