From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:60397) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hGPQ0-0006Dw-Ae for qemu-devel@nongnu.org; Tue, 16 Apr 2019 10:50:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hGPPz-00030o-AR for qemu-devel@nongnu.org; Tue, 16 Apr 2019 10:50:40 -0400 Received: from indium.canonical.com ([91.189.90.7]:54294) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hGPPz-0002yM-20 for qemu-devel@nongnu.org; Tue, 16 Apr 2019 10:50:39 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1hGPPx-0001tR-GY for ; Tue, 16 Apr 2019 14:50:37 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 7A7B92E80CC for ; Tue, 16 Apr 2019 14:50:37 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Tue, 16 Apr 2019 14:41:31 -0000 From: TimeMaster Reply-To: Bug 1824768 <1824768@bugs.launchpad.net> Sender: bounces@canonical.com References: <155531602468.14046.8896369782282114161.malonedeb@gac.canonical.com> Message-Id: <155542569115.14094.5882527741991186132.malone@gac.canonical.com> Errors-To: bounces@canonical.com Subject: [Qemu-devel] [Bug 1824768] Re: Qemu ARMv7 TCG MultiThreading for i386 guest doesn't work List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Yes, I can imagine that. Unfortunately, my programming knowledge isn't so strong to help you with it. But can help with testing if it is useful. Alex Benn=C3=A9e pointed me to this patch: = [RFC,v3,4/5] mttcg: Implement implicit ordering semantics Which maybe could help. I can try to compile it and do the requested tests. -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1824768 Title: Qemu ARMv7 TCG MultiThreading for i386 guest doesn't work Status in QEMU: New Bug description: Using any Linux image (in this case Alpine Linux iso) I want to utilise all cores of my Raspberry with --accel,thread=3Dmulti. I know there is a probably still problem with memory ordering of the host, but I have also seen some very old commits which could potentially help with it. But anyway, with version qemu-i386 version 3.1.0 (Debian 1:3.1+dfsg-7) I can see OpenRC starting up services and then the kernel crash. With version QEMU emulator version 3.1.93 (v4.0.0-rc3-dirty) The whole machine crash with this error: Illegal instruction Using command: ./qemu-system-i386 -cdrom alpine.iso --accel tcg,thread=3Dmulti Full Console Output: qemu-system-i386: warning: Guest expects a stronger memory ordering than = the host provides This may cause strange/hard to debug errors Illegal instruction Kernel: Linux raspberrypi 4.14.98-v7+ #1200 SMP Tue Feb 12 20:27:48 GMT 2019 armv= 7l GNU/Linux CPU: ARMv7 Processor rev 5 (v7l) Features: half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt v= fpd32 lpae evtstrm 4 cores To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1824768/+subscriptions