[Bug 1890069] Re: QEMU is not allowing multiple cores with mips architecture
[Expired for qemu (Ubuntu) because there has been no activity for 60 days.] ** Changed in: qemu (Ubuntu) Status: Incomplete => Expired -- 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
[Bug 1890069] Re: QEMU is not allowing multiple cores with mips architecture
Q: How can I test qemu 5.0 as groovy has not been released yet? A: you can get that already, depending on your preferred way to deploy there are different options: You can download a daily build of the ISO: http://cdimage.ubuntu.com/daily-live/current/ http://cdimage.ubuntu.com/ubuntu-server/daily-live/current/ Cloud-images: https://cloud-images.ubuntu.com/groovy/current/ Or you can upgrade a system that you already have via: (I assume you do so from 20.04) set in /etc/update-manager/release-upgrades prompt=normal Then run $ do-release-upgrade -d Or (least impact to your existing system) use a container. You only use emulation, so you don't even need tricks to expose x86 HW acceleration for virtualization, just get a 20.10 system and work in there as you'd normally. $ lxc launch ubuntu-daily:g g-20.10 $ lxc exec g-20.10 -- 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
[Bug 1890069] Re: QEMU is not allowing multiple cores with mips architecture
This hasn't worked at any point yet, as I'm trying to emulate MIPS that has more than one core that it can use for a workload. Images used: http://ftp.debian.org/debian/dists/stable/main/installer-mips/current/images/malta/netboot/initrd.gz http://ftp.debian.org/debian/dists/stable/main/installer-mips/current/images/malta/netboot/vmlinux-4.19.0-10-4kc-malta I don't know if -smp is the right thing to use for it to begin with, but that's the only thing I found that's even close to getting more cores to the system. My hardware that's running MIPS, is MIPS 1004Kc V2.15, and it has 4 cores. I'm trying to emulate it with QEMU. --- processor : 3 cpu model : MIPS 1004Kc V2.15 BogoMIPS: 581.63 wait instruction: yes microsecond timers : yes tlb_entries : 32 extra interrupt vector : yes hardware watchpoint : yes, count: 4, address/irw mask: [0x0ffc, 0x0ffc, 0x0ffb, 0x0ffb] isa : mips1 mips2 mips32r1 mips32r2 ASEs implemented: mips16 dsp mt shadow register sets: 1 kscratch registers : 0 package : 0 core: 1 VPE : 1 VCED exceptions : not available VCEI exceptions : not available --- How can I test qemu 5.0 as groovy has not been released yet? -- 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
[Bug 1890069] Re: QEMU is not allowing multiple cores with mips architecture
These are old, but might still be true: https://lists.gnu.org/archive/html/qemu-devel/2013-06/msg04436.html https://qemu-devel.nongnu.narkive.com/m6BNDsfR/does-qemu-support-mips-smp2-malta-board https://www.mail-archive.com/debian-mips@lists.debian.org/msg10710.html If that is it then that is a natural limitation. The only bit I've seen mentioning >2 to work is https://www.mips.com/blog/how-to-run-smp-linux-in-qemu-on-a-mips64-release-6-cpu/ But the I6400 cpu doesn't exist with newer qemus I7200 does but doesn't work either. This seems like an upstream feature request to me, but one that was mostly denied 7 years ago (by architecture unable to do so). Let me know if this is a regression and if I missed something. Otherwise yeah - you could start a new upstream discussion, but no promises it will end any different than the past ones. ** Changed in: qemu (Ubuntu) Status: New => Incomplete -- 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
[Bug 1890069] Re: QEMU is not allowing multiple cores with mips architecture
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::-: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::-: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::-: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) [0.00] 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
[Bug 1890069] Re: QEMU is not allowing multiple cores with mips architecture
Hi Skyler, mips emulation is rather rare - so there is always a chance that something broke without being recognized at first. For a start let me ask a few questions to corner the issue: 1. did that work before and is a regression in the qemu 4.2 of Ubuntu? 2. check other versions - could you try the same with qemu 3.1 (Bionic) and 5.0 (groovy) of Ubuntu if it is the same? 3. after we know of the above if new/old versions were ok it could be worth checking pristine upstream qemu builds to see if any delta in Ubuntu has to be fixed. Depending on your time and ability to do so would you be able to build from tags of https://git.qemu.org/?p=qemu.git? (TL;DR; add deb-src lines in /etc/apt/sources.list, apt build-dep qemu; In general maybe attach the kernel/initrd of your test so others can try the same. I assume you used something like http://ftp.debian.org/debian/dists/stable/main/installer-mips/current/images/malta/netboot/ ? Once that is sorted we know better if we look at a "how to use question" or an actual bug - and for the latter if it is a regression of some sort (which would make us hunt for the offending change). -- 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
