From: TimeMaster <timemaster@trillinis.com>
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 14:05:15 -0000 [thread overview]
Message-ID: <155542351526.20682.6727297620728065945.malone@soybean.canonical.com> (raw)
In-Reply-To: 155531602468.14046.8896369782282114161.malonedeb@gac.canonical.com
Thank you for the explanation. I found some patches a few years old, so
I thought the implementation is now complete especially when ARM is
getting more and more popular.
Does it have some priority assigned? Or does it even make sense to do
it? From my perspective, yes even with the broken support the whole boot
process was blazingly fast on Raspberry and seemed that kernel was able
to start and then crashed. Even this was so fast compared to one core.
It's interesting there are no more people wanting this. Maybe I am
missing another trend :)
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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
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next prev parent reply other threads:[~2019-04-16 14:11 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 [this message]
2019-04-16 14:17 ` Peter Maydell
2019-04-16 14:41 ` TimeMaster
2019-04-16 14:59 ` Peter Maydell
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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