From: Paolo Bonzini <pbonzini@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: mttcg@greensocs.com,
"Alexander Spyridakis" <a.spyridakis@virtualopensystems.com>,
"Mark Burton" <mark.burton@greensocs.com>,
"Alexander Graf" <agraf@suse.de>,
"QEMU Developers" <qemu-devel@nongnu.org>,
"Guillaume Delbergue" <guillaume.delbergue@greensocs.com>,
"Alistair Francis" <alistair.francis@xilinx.com>,
"Alex Bennée" <alex.bennee@linaro.org>,
"Frederic Konrad" <fred.konrad@greensocs.com>
Subject: Re: [Qemu-devel] [RFC PATCH V6 15/18] cpu: introduce tlb_flush*_all.
Date: Fri, 26 Jun 2015 18:54:15 +0200 [thread overview]
Message-ID: <558D83B7.50104@redhat.com> (raw)
In-Reply-To: <CAFEAcA9kK0Hpphyf18uVA7M9VQeFpKN-u5JrDw+uHoqCxs6UEA@mail.gmail.com>
On 26/06/2015 18:08, Peter Maydell wrote:
>> > Yeah, ISTR that in some cases you have to wait for other CPUs to
>> > invalidate the TLB before proceeding. Maybe it's only when you have a
>> > dmb instruction, but it's probably simpler for QEMU to always do it
>> > synchronously.
> Yeah, the ARM architectural requirement here is that the TLB
> operation is complete after a DSB instruction executes. (True for
> any TLB op, not just the all-CPUs ones). NB that we also call
> tlb_flush() from target-arm/ code for some things like "we just
> updated a system register"; some of those have "must take effect
> immediately" semantics.
>
> In any case, for generic code we have to also consider the
> semantics of non-ARM guests...
I think it would be okay to make this an ARM-specific thing. In most
other architectures that I know of, TLB shootdowns are done in software
thorough IPI.
Paolo
next prev parent reply other threads:[~2015-06-26 16:54 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-26 14:47 [Qemu-devel] [RFC PATCH V6 00/18] Multithread TCG fred.konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 01/18] cpu: make cpu_thread_is_idle public fred.konrad
2015-07-07 9:47 ` Alex Bennée
2015-07-07 11:43 ` Frederic Konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 02/18] replace spinlock by QemuMutex fred.konrad
2015-07-07 10:15 ` Alex Bennée
2015-07-07 10:22 ` Paolo Bonzini
2015-07-07 11:48 ` Frederic Konrad
2015-07-07 12:34 ` Paolo Bonzini
2015-07-07 13:06 ` Frederic Konrad
2015-07-07 11:46 ` Frederic Konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 03/18] remove unused spinlock fred.konrad
2015-06-26 14:53 ` Paolo Bonzini
2015-06-26 15:29 ` Frederic Konrad
2015-06-26 15:46 ` Paolo Bonzini
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 04/18] add support for spin lock on POSIX systems exclusively fred.konrad
2015-06-26 14:55 ` Paolo Bonzini
2015-06-26 15:31 ` Frederic Konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 05/18] protect TBContext with tb_lock fred.konrad
2015-06-26 14:56 ` Paolo Bonzini
2015-06-26 15:39 ` Frederic Konrad
2015-06-26 15:45 ` Paolo Bonzini
2015-06-26 16:20 ` Paolo Bonzini
2015-07-07 12:22 ` Alex Bennée
2015-07-07 13:16 ` Frederic Konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 06/18] tcg: remove tcg_halt_cond global variable fred.konrad
2015-06-26 15:02 ` Paolo Bonzini
2015-06-26 15:41 ` Frederic Konrad
2015-07-07 12:27 ` Alex Bennée
2015-07-07 13:17 ` Frederic Konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 07/18] Drop global lock during TCG code execution fred.konrad
2015-06-26 14:56 ` Jan Kiszka
2015-06-26 15:08 ` Paolo Bonzini
2015-06-26 15:36 ` Frederic Konrad
2015-06-26 15:42 ` Jan Kiszka
2015-06-26 16:11 ` Frederic Konrad
2015-07-07 12:33 ` Alex Bennée
2015-07-07 13:18 ` Frederic Konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 08/18] cpu: remove exit_request global fred.konrad
2015-06-26 15:03 ` Paolo Bonzini
2015-07-07 13:04 ` Alex Bennée
2015-07-07 13:25 ` Frederic Konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 09/18] cpu: add a tcg_executing flag fred.konrad
2015-07-07 13:23 ` Alex Bennée
2015-07-07 13:30 ` Frederic Konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 10/18] tcg: switch on multithread fred.konrad
2015-07-07 13:40 ` Alex Bennée
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 11/18] cpus: make qemu_cpu_kick_thread public fred.konrad
2015-07-07 15:11 ` Alex Bennée
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 12/18] Use atomic cmpxchg to atomically check the exclusive value in a STREX fred.konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 13/18] cpu: introduce async_run_safe_work_on_cpu fred.konrad
2015-06-26 15:35 ` Paolo Bonzini
2015-06-26 16:09 ` Frederic Konrad
2015-06-26 16:23 ` Paolo Bonzini
2015-06-26 16:36 ` Frederic Konrad
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 14/18] add a callback when tb_invalidate is called fred.konrad
2015-06-26 16:20 ` Paolo Bonzini
2015-06-26 16:40 ` Frederic Konrad
2015-07-07 15:32 ` Alex Bennée
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 15/18] cpu: introduce tlb_flush*_all fred.konrad
2015-06-26 15:15 ` Paolo Bonzini
2015-06-26 15:54 ` Frederic Konrad
2015-06-26 16:01 ` Paolo Bonzini
2015-06-26 16:08 ` Peter Maydell
2015-06-26 16:30 ` Frederic Konrad
2015-06-26 16:31 ` Paolo Bonzini
2015-06-26 16:35 ` Frederic Konrad
2015-06-26 16:39 ` Paolo Bonzini
2015-07-06 14:29 ` Mark Burton
2015-07-07 16:12 ` Alex Bennée
2015-06-26 16:54 ` Paolo Bonzini [this message]
2015-07-08 15:35 ` Frederic Konrad
2015-07-07 15:52 ` Alex Bennée
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 16/18] arm: use tlb_flush*_all fred.konrad
2015-07-07 16:14 ` Alex Bennée
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 17/18] translate-all: introduces tb_flush_safe fred.konrad
2015-07-07 16:16 ` Alex Bennée
2015-06-26 14:47 ` [Qemu-devel] [RFC PATCH V6 18/18] translate-all: (wip) use tb_flush_safe when we can't alloc more tb fred.konrad
2015-06-26 16:21 ` Paolo Bonzini
2015-06-26 16:38 ` Frederic Konrad
2015-07-07 16:17 ` Alex Bennée
2015-07-07 16:23 ` Frederic Konrad
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=558D83B7.50104@redhat.com \
--to=pbonzini@redhat.com \
--cc=a.spyridakis@virtualopensystems.com \
--cc=agraf@suse.de \
--cc=alex.bennee@linaro.org \
--cc=alistair.francis@xilinx.com \
--cc=fred.konrad@greensocs.com \
--cc=guillaume.delbergue@greensocs.com \
--cc=mark.burton@greensocs.com \
--cc=mttcg@greensocs.com \
--cc=peter.maydell@linaro.org \
--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).