I was quickly giving things a check but don't have the time to do the full matrix:
The old bits from https://people.debian.org/~aurel32/qemu/mipsel/ $ qemu-system-mips64el -M malta -kernel vmlinux-3.2.0-4-4kc-malta -nographic -curses Later the kernels are more obviously split (mipsel/mips64/mips64el) build at https://people.debian.org/~jcowgill/qemu-mips/ I can get to run with: $ qemu-system-mips64el -M malta -cpu MIPS64R2-generic -m 2G -kernel vmlinux-4.15.0-1-5kc-malta.mips64el.sid -nographic -curses $ qemu-system-mips64el -M malta -cpu MIPS64R2-generic -m 2G -kernel vmlinux-4.15.0-1-5kc-malta.mipsel.sid -nographic -curses $ qemu-system-mips64 -M malta -cpu MIPS64R2-generic -m 2G -kernel vmlinux-4.15.0-1-5kc-malta.mips.sid -nographic -curses Zoning in to something close to your kernel that you've tried from http://ftp.debian.org/debian/dists/stable/main/installer-mips/current/images/malta/netboot/ works with: $ qemu-system-mips64 -M malta -cpu MIPS64R2-generic -m 2G -kernel vmlinux-4.19.0-10-4kc-malta -nographic -curses >From here I was slowly getting more similar to your commandline. Sill works: $ qemu-system-mips -M malta -m 2G -kernel vmlinux-4.19.0-10-4kc-malta -nographic -curses add initrd: $ qemu-system-mips -M malta -m 2G -kernel vmlinux-4.19.0-10-4kc-malta -initrd initrd-4.19.0-10-4kc-$malta.gz -nographic -curses Add net: $ qemu-system-mips -M malta -m 2G -kernel vmlinux-4.19.0-10-4kc-malta -initrd initrd-4.19.0-10-4kc-malta.gz -nographic -curses -nographic -device e1000,netdev=user.0 -netdev user,id=user.0,hostfwd=tcp::5555-:22 reduce memory: $ qemu-system-mips -M malta -m 512 -kernel vmlinux-4.19.0-10-4kc-malta -initrd initrd-4.19.0-10-4kc-malta.gz -nographic -curses -nographic -device e1000,netdev=user.0 -netdev user,id=user.0,hostfwd=tcp::5555-:22 kernel commandline: $ qemu-system-mips -M malta -m 512 -kernel vmlinux-4.19.0-10-4kc-malta -initrd initrd-4.19.0-10-4kc-malta.gz -nographic -curses -nographic -device e1000,netdev=user.0 -netdev user,id=user.0,hostfwd=tcp::5555-:22 -append "root=/dev/sda1 console=ttyS0" All that worked, what got it stuck was the smp option that you used. -smp 1 works -smp 2 works -smp 3 stuck -smp 4 stuck qemu-system-mips: /build/qemu-BQ4hMP/qemu-4.2/hw/acpi/cpu.c:198: cpu_hotplug_hw_init: Assertion `mc->possible_cpu_arch_ids' failed. Aborted (core dumped) -smp 4 stuck (retry) [ 0.000000] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: (null) With more memory I get slightly further until stuck, up to -smp 12 things won't get better. Not sure how good/bad smp is in emulated mips - we are back to my initial question - did this work in the past and regressed - or is it instead an upstream feature request for (better) mips emu SMP? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1890069 Title: QEMU is not allowing multiple cores with mips architecture To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1890069/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
