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From: Peter Maydell <peter.maydell@linaro.org>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] [Bug 1824768] Re: Qemu ARMv7 TCG MultiThreading for i386 guest doesn't work
Date: Tue, 16 Apr 2019 14:59:40 -0000	[thread overview]
Message-ID: <155542678040.20506.14195198758956526514.malone@chaenomeles.canonical.com> (raw)
In-Reply-To: 155531602468.14046.8896369782282114161.malonedeb@gac.canonical.com

That patch is already in QEMU (commit b32dc3370a666e23). It sounds like
we're a bit further forward with this than I thought we might be, but
clearly not everything necessary is implemented.

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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=multi. 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=multi

  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 armv7l GNU/Linux

  CPU:
  ARMv7 Processor rev 5 (v7l)
  Features: half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm
  4 cores

To manage notifications about this bug go to:
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  parent reply	other threads:[~2019-04-16 15:11 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-15  8:13 [Qemu-devel] [Bug 1824768] [NEW] Qemu ARMv7 TCG MultiThreading for i386 guest doesn't work TimeMaster
2019-04-16 13:44 ` [Qemu-devel] [Bug 1824768] " Peter Maydell
2019-04-16 14:05 ` TimeMaster
2019-04-16 14:17 ` Peter Maydell
2019-04-16 14:41 ` TimeMaster
2019-04-16 14:59 ` Peter Maydell [this message]
2019-04-16 15:13 ` TimeMaster
2019-04-21 17:58 ` Richard Henderson
2019-04-21 19:48 ` Richard Henderson
2019-04-22 15:18 ` TimeMaster
2019-06-22  4:17 ` Launchpad Bug Tracker

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