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 <a...@alex.org.uk> 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 <a...@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefa...@redhat.com> 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
