From: David Gibson <david@gibson.dropbear.id.au>
To: Greg Kurz <groug@kaod.org>
Cc: "Alexey Kardashevskiy" <aik@ozlabs.ru>,
qemu-ppc@nongnu.org, "Cédric Le Goater" <clg@kaod.org>,
qemu-devel@nongnu.org
Subject: Re: [PATCH 0/4] spapr: Get rid of CAS reboot flag
Date: Tue, 31 Mar 2020 11:44:15 +1100 [thread overview]
Message-ID: <20200331004415.GC47772@umbus.fritz.box> (raw)
In-Reply-To: <158514992409.478799.6718223069768660390.stgit@bahia.lan>
[-- Attachment #1: Type: text/plain, Size: 1467 bytes --]
On Wed, Mar 25, 2020 at 04:25:24PM +0100, Greg Kurz wrote:
> The CAS reboot flag was introduced in QEMU 2.10 to allow the guest
> to be presented a new boot-time device tree after CAS negotiation.
> CAS-generated resets rely on qemu_system_reset_request() which has
> the particularity of dropping the main loop lock at some point. This
> opens a window where migration can happen, hence promotting the CAS
> reboot flag to actual state that we should also migrate. In practice,
> this can't happen anymore since we have eliminated the scenario of
> the XICS/XIVE switch and the much less frequent scenario of device
> plug/unplug before CAS.
>
> We still have much of the CAS reboot bits around though. The full FDT
> rendering we do at CAS is enough to get rid of them once and far all.
>
> Some preliminary cleanup is made before going for the full removal,
> for easier reviewing. At some point I had the need to move some code
> around in CAS, and Alexey's patch from the "spapr: kill SLOF" (v8)
> series proved to be helpful so I've reused it in this patchset.
>
> This series applies cleanly on both ppc-for-5.0 and ppc-for-5.1.
> Since it doesn't fix any actual bug, I think this can be delayed
> to 5.1.
Applied to ppc-for-5.1.
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 833 bytes --]
next prev parent reply other threads:[~2020-03-31 0:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-25 15:25 [PATCH 0/4] spapr: Get rid of CAS reboot flag Greg Kurz
2020-03-25 15:25 ` [PATCH 1/4] spapr: Don't check capabilities removed between CAS calls Greg Kurz
2020-03-26 0:02 ` David Gibson
2020-03-25 15:25 ` [PATCH 2/4] spapr: Simplify selection of radix/hash during CAS Greg Kurz
2020-03-25 15:25 ` [PATCH 3/4] spapr/cas: Separate CAS handling from rebuilding the FDT Greg Kurz
2020-03-25 15:25 ` [PATCH 4/4] spapr: Drop CAS reboot flag Greg Kurz
2020-03-31 0:44 ` David Gibson [this message]
2020-03-31 2:59 ` [PATCH 0/4] spapr: Get rid of " Alexey Kardashevskiy
2020-03-31 7:08 ` Greg Kurz
2020-03-31 10:29 ` Alexey Kardashevskiy
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200331004415.GC47772@umbus.fritz.box \
--to=david@gibson.dropbear.id.au \
--cc=aik@ozlabs.ru \
--cc=clg@kaod.org \
--cc=groug@kaod.org \
--cc=qemu-devel@nongnu.org \
--cc=qemu-ppc@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).