Re: QEMU hangs with smp option on ubuntu 16.04 ... any fix?

[Jun Sun <jsun@junsun.net>]

After I added "-cpu 34Kf", qemu would start normally again even with "-smp 2" option.

However, "cat /proc/cpuinfo" only shows 1 CPU.  "uname -a" shows the following which seems to suggest the kernel is not SMP aware.  Is there a kernel for malta with SMP support?

Linux debian-mips 4.9.0-7-4kc-malta #1 Debian 4.9.110-3+deb9u2 (2018-08-13) mips GNU/Linux

Thanks.

Jun

On Sat, Oct 6, 2018 at 8:47 AM Jun Sun <jsun@junsun.net> wrote:

Hi, all,

I've been loosely following the instruct at this page, https://github.com/kholia/mips-hacking

My host is ubuntu 16.04.  I used ubuntu prebuilt qemu system images.

My guest is the latest stretch 9.5 malta netboot images.  Kernel is vmlinux-4.9.0-7-4kc-malta.

Below is my startup script.  If I change "smp" to 2, the startup will hang very early on.   Does anybody if this is a known limit with debian distro?  Or it is an issue with the ubuntu prebuilt qemu?  Or there are some other gotcha's here?

qemu-system-mips \

-M malta \

-m 256 \

-hda hda.qcow2 \

-kernel vmlinux-4.9.0-7-4kc-malta \

-initrd initrd.img-4.9.0-7-4kc-malta \

    -append "root=/dev/sda1 console=ttyS0 nokaslr" \

-nographic \

-redir tcp:2222::22 \

-smp 1 \

\

Cheers.

Jun