From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:42019)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <pbonzini@redhat.com>) id 1Z8WXI-0008OS-47
	for qemu-devel@nongnu.org; Fri, 26 Jun 2015 12:31:28 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <pbonzini@redhat.com>) id 1Z8WXE-0002a8-VR
	for qemu-devel@nongnu.org; Fri, 26 Jun 2015 12:31:28 -0400
Received: from mx1.redhat.com ([209.132.183.28]:59815)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <pbonzini@redhat.com>) id 1Z8WXE-0002a1-Pt
	for qemu-devel@nongnu.org; Fri, 26 Jun 2015 12:31:24 -0400
References: <1435330053-18733-1-git-send-email-fred.konrad@greensocs.com>
	<1435330053-18733-16-git-send-email-fred.konrad@greensocs.com>
	<558D6C7E.6020905@redhat.com> <558D75D0.6060906@greensocs.com>
	<558D776E.20705@redhat.com>
	<CAFEAcA9kK0Hpphyf18uVA7M9VQeFpKN-u5JrDw+uHoqCxs6UEA@mail.gmail.com>
	<558D7E11.80807@greensocs.com>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <558D7E56.5060306@redhat.com>
Date: Fri, 26 Jun 2015 18:31:18 +0200
MIME-Version: 1.0
In-Reply-To: <558D7E11.80807@greensocs.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [RFC PATCH V6 15/18] cpu: introduce tlb_flush*_all.
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Frederic Konrad <fred.konrad@greensocs.com>, Peter Maydell <peter.maydell@linaro.org>
Cc: mttcg@greensocs.com, Alexander Graf <agraf@suse.de>, Alexander Spyridakis <a.spyridakis@virtualopensystems.com>, Mark Burton <mark.burton@greensocs.com>, QEMU Developers <qemu-devel@nongnu.org>, Alistair Francis <alistair.francis@xilinx.com>, Guillaume Delbergue <guillaume.delbergue@greensocs.com>, =?UTF-8?Q?Alex_Benn=c3=a9e?= <alex.bennee@linaro.org>



On 26/06/2015 18:30, Frederic Konrad wrote:
> Yes this is not the case as I implemented it.
> 
> The rest of the TB will be executed before the tlb_flush work really 
> happen. The old version did this, was slow and was a mess (if two
> VCPUs want to tlb_flush at the same time and an other
> tlb_flush_page.. it becomes tricky..)

Have you tried implementing the solution based on cpu->halted?

> I think it's not really terrible if the other VCPU execute some
> stuff before doing the tlb_flush.? So the solution would be only to
> cut the TranslationBlock after instruction which require a
> tlb_flush?

Yes, this is required too.

Paolo