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[Qemu-devel] arm: vexpress SMP broken?
From: |
Peter Crosthwaite |
Subject: |
[Qemu-devel] arm: vexpress SMP broken? |
Date: |
Tue, 2 Sep 2014 17:12:26 +1000 |
Hi All,
I'm having trouble getting SMP to work on the vexpress platform. Looks
like a regression.
Following these instructions using latest QEMU:
http://wiki.ecg.rice.edu/doku.php?id=xzl:tutorial:arm_qemu
section "Try ARM Linux prebuilt image on QEMU" with addition of "-smp
2" argument, it fails to probe secondary CPUs:
./qemu-build/arm-softmmu/qemu-system-arm -kernel ../tmp/uImage -M
vexpress-a9 -cpu cortex-a9 -serial mon:stdio -m 1024 -initrd ./initrd
-append 'root=/dev/mmcblk0p2 rw mem=1024M raid=noautodetect
console=ttyAMA0,38400n8 rootwait vmalloc=256MB devtmpfs.mount=0' -sd
vexpress-a9-nano.img -nographic -smp 2
Uncompressing Linux... done, booting the kernel.
[ 0.000000] Booting Linux on physical CPU 0
...
[ 0.510327] CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
[ 0.512100] Calibrating local timer... 99.40MHz.
[ 0.565227] hw perfevents: enabled with ARMv7 Cortex-A9 PMU driver,
1 counters available
[ 1.090777] CPU1: Booted secondary processor
[ 8.655956] CPU1: failed to come online
[ 8.680134] Brought up 1 CPUs
[ 8.680394] SMP: Total of 1 processors activated (609.07 BogoMIPS).
A bisection points at:
commit 6d327171551a12b937c5718073b9848d0274c74d
Author: Alex Bligh <address@hidden>
Date: Wed Aug 21 16:02:59 2013 +0100
aio / timers: Remove alarm timers
Remove alarm timers from qemu-timers.c now we use g_poll / ppoll
instead.
Signed-off-by: Alex Bligh <address@hidden>
Signed-off-by: Stefan Hajnoczi <address@hidden>
Using the parent to this commit (latest good revision =
54904d2a9165bd34dee0f076826b308be2498fe0) gives:
[ 0.719852] CPU1: Booted secondary processor
[ 0.859186] CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
[ 0.899732] CPU1: Unknown IPI message 0x1
[ 0.922516] Brought up 2 CPUs
[ 0.922768] SMP: Total of 2 processors activated (1209.54 BogoMIPS).
This a know issue or anyone have any insights?
Regards,
Peter
- [Qemu-devel] arm: vexpress SMP broken?,
Peter Crosthwaite <=