From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:40719) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hIGrD-0005DN-Du for qemu-devel@nongnu.org; Sun, 21 Apr 2019 14:06:28 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hIGqL-0006cG-EQ for qemu-devel@nongnu.org; Sun, 21 Apr 2019 14:05:34 -0400 Received: from indium.canonical.com ([91.189.90.7]:33060) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1hIGqL-0006b7-1U for qemu-devel@nongnu.org; Sun, 21 Apr 2019 14:05:33 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1hIGqJ-0001s9-QA for ; Sun, 21 Apr 2019 18:05:31 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id A677A2E80CB for ; Sun, 21 Apr 2019 18:05:31 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Sun, 21 Apr 2019 17:58:36 -0000 From: Richard Henderson Reply-To: Bug 1824768 <1824768@bugs.launchpad.net> Sender: bounces@canonical.com References: <155531602468.14046.8896369782282114161.malonedeb@gac.canonical.com> Message-Id: <155586951633.17507.5226773156249201962.malone@soybean.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 When you say > ./qemu-system-i386 -cdrom alpine.iso --accel tcg,thread=3Dmulti you have not created multiple cpus for the guest, so thread=3Dmulti should have no effect. For what it's worth, a boot of debian-9.8.0-i386-netinst.iso (which is what I happened to have handy) works fine with = ./qemu-system-i386 -cdrom ... -m 1G --accel tcg,thread=3Dmulti on an x-gene system, compiled for aarch32. You should note that the default memory allocation is only 128MB, and I'd be surprised if you can boot the alpine installation in that little memory. Certainly it does not work with debian. On the other hand, the failure is a simple guest kernel panic and not any kind of Illegal Instruction. I'll try again in a moment with a cortex-a15 system, but I'm not expecting any different result. Just so we're clear, which raspberry pi revision are you using? Based on comments I'm assuming pi 2, with the 4 core cortex-a7. -- = 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