From: Andrey Smetanin <asmetanin@virtuozzo.com>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Question: cpu_physical_memory_map() and atomic test and set bit pattern
Date: Mon, 3 Aug 2015 13:38:38 +0300 [thread overview]
Message-ID: <55BF44AE.7020909@virtuozzo.com> (raw)
Hello, QEMU Developers!
cpu_physical_memory_map() calls directly addess_space_map() which has
comment "Use only for reads OR writes - not for read-modify-write
operations."
Why there is such restriction (only read or write access) in
addess_space_map()/cpu_physical_memory_map() ?
How to transparently atomically test and set bit of guest memory inside
QEMU host?
Is there any API for that pattern ? Or may I use cpu_physical_memory_map
with is_write = 1 for that safely ?
Thanks,
Andrey
reply other threads:[~2015-08-03 10:53 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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=55BF44AE.7020909@virtuozzo.com \
--to=asmetanin@virtuozzo.com \
--cc=qemu-devel@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).