From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:47429) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bp1rf-00053x-HJ for qemu-devel@nongnu.org; Tue, 27 Sep 2016 19:32:44 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bp1rb-0006CJ-8k for qemu-devel@nongnu.org; Tue, 27 Sep 2016 19:32:42 -0400 Received: from mail-wm0-x22c.google.com ([2a00:1450:400c:c09::22c]:37939) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bp1rb-0006BX-2T for qemu-devel@nongnu.org; Tue, 27 Sep 2016 19:32:39 -0400 Received: by mail-wm0-x22c.google.com with SMTP id l132so40492775wmf.1 for ; Tue, 27 Sep 2016 16:32:38 -0700 (PDT) References: <87wpk8k3dn.fsf@linaro.org> <87eg677k2x.fsf@linaro.org> <5d48957b-780b-aa9c-7061-cba6808909b4@redhat.com> <20160927222935.GA21144@flamenco> From: Alex =?utf-8?Q?Benn=C3=A9e?= In-reply-to: Date: Wed, 28 Sep 2016 00:32:37 +0100 Message-ID: <8737kkx6ju.fsf@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Subject: Re: [Qemu-devel] Making cputlb.c operations safe for MTTCG List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Richard Henderson Cc: "Emilio G. Cota" , Paolo Bonzini , MTTCG Devel , QEMU Developers , a.rigo@virtualopensystems.com, Sergey Fedorov , Frederic Konrad Richard Henderson writes: > On 09/27/2016 03:29 PM, Emilio G. Cota wrote: >> What's a quick-and-dirty way to disable the fast-path TLB lookups? >> Alex: you told me the monitor has an option for this, but I can't >> find it. I'm looking for something that'd go in tcg/i386 to simply >> bypass the fast path. > > There is no easy way. If you need that, you'd have to significantly modify the > tcg backend. Surely all the backends force the slow-path when any of TLB_FLAGS_MASK are set. Unless adding an extra bit is going to run out of spare bits on some backends? > > > r~ -- Alex Bennée