From: Olaf Hering <olaf@aepfle.de>
To: Andres Lagar-Cavilla <andres@lagarcavilla.org>
Cc: xen-devel@lists.xensource.com, tim@xen.org, ian.campbell@citrix.com
Subject: Re: 4.2 TODO update
Date: Tue, 14 Feb 2012 16:18:03 +0100 [thread overview]
Message-ID: <20120214151803.GA22116@aepfle.de> (raw)
In-Reply-To: <f56b9a9d22ed4bc42e77212c43b364ec.squirrel@webmail.lagarcavilla.org>
On Tue, Feb 14, Andres Lagar-Cavilla wrote:
> Why? Because it's really really hard to guarantee we'll go to sleep in an
> atomic context. The main use for wait queues (imho) is in hvm_copy, and
> there's a zillion paths going into hvm_copy (copy_from/to_user!) with all
> ways of bumping the preemption count.
If the guests pagetable is paged out this code path will trigger, then
one of the hypercalls returns an error and the guest runs into a BUG().
I think it was decrease_reservation, or similar.
Another thing reported by Huawei on this list was somewhere in the
emulation code where a gfn_to_mfn() failed.
What other way exist to make paging 100% transparent to the guest?
Olaf
next prev parent reply other threads:[~2012-02-14 15:18 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.3388.1329129411.1471.xen-devel@lists.xensource.com>
2012-02-14 14:58 ` 4.2 TODO update Andres Lagar-Cavilla
2012-02-14 15:18 ` Olaf Hering [this message]
2012-02-14 16:47 ` Andres Lagar-Cavilla
2012-02-14 17:18 ` Olaf Hering
2012-02-14 17:34 ` Andres Lagar-Cavilla
2012-02-14 20:05 ` Tim Deegan
2012-02-15 16:22 ` Andres Lagar-Cavilla
2012-02-15 17:07 ` Tim Deegan
2012-03-12 12:11 Ian Campbell
2012-03-12 13:42 ` Ian Campbell
2012-03-12 13:51 ` Jan Beulich
2012-03-12 15:27 ` Ian Campbell
2012-03-12 13:55 ` Roger Pau Monné
2012-03-12 16:01 ` Stefano Stabellini
2012-03-13 8:57 ` Ian Campbell
2012-03-12 16:36 ` George Dunlap
2012-03-12 16:42 ` Ian Campbell
2012-03-13 10:50 ` George Dunlap
2012-03-14 16:48 ` Dario Faggioli
2012-03-14 16:51 ` Ian Campbell
[not found] <mailman.4065.1329753857.1471.xen-devel@lists.xensource.com>
2012-02-20 20:00 ` Andres Lagar-Cavilla
-- strict thread matches above, loose matches on Subject: below --
2012-02-20 15:52 Ian Campbell
2012-02-13 10:17 Ian Campbell
2012-02-13 10:24 ` Tim Deegan
2012-02-13 10:46 ` George Dunlap
2012-02-13 11:05 ` Fantu
2012-02-13 11:23 ` Ian Campbell
2012-02-13 11:50 ` Anthony PERARD
2012-02-13 11:56 ` Ian Campbell
2012-02-21 2:38 ` Michael A. Collins
2012-02-21 8:51 ` Ian Campbell
2012-02-13 11:29 ` Jan Beulich
2012-02-13 11:32 ` Ian Campbell
2012-02-13 12:04 ` Jan Beulich
2012-02-13 12:18 ` Stefano Stabellini
2012-02-14 14:56 ` Jan Beulich
2012-02-13 11:39 ` Anthony PERARD
2012-02-13 11:57 ` Stefano Stabellini
2012-02-13 19:11 ` Shriram Rajagopalan
2012-02-17 10:23 ` Ian Campbell
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=20120214151803.GA22116@aepfle.de \
--to=olaf@aepfle.de \
--cc=andres@lagarcavilla.org \
--cc=ian.campbell@citrix.com \
--cc=tim@xen.org \
--cc=xen-devel@lists.xensource.com \
/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).