[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
** Also affects: qemu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1448985/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
** Also affects: qemu Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1448985/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
Finally with a little help on debugging unity, I think I see what is going on. The obvious part seemed to be that compiz seems to fail starting. Which turns out to be LLVM-pipe bailing with an obscure error message: LLVM ERROR: Do not know how to split the result of this operator! This made me think about the emulated CPU, even more because Xen HVM guests do work with the i386 isos. And really this is the actual problem! So one quick work-around is to force qemu to use a different CPU type. In my test I used the Wily i386 iso and changed the CPU type from the default (QEMU Virtual CPU v2.0.0) into core2duo. And suddenly the live session works. So next, what is the difference. Beside of name, model, and stepping, it seems the cpuid flags: Core(TM)2 Duo CPU (emulated)QEMU Virtual CPU v2.0.0 model 15model 6 stepping 11 stepping 3 cpuid level 10 cpuid level 4 ore(TM)2 Duo CPU (emulated) QEMU Virtual CPU v2.0.0 model 15model 6 stepping 11 stepping 3 cpuid level 10 cpuid level 4 --fpu vme de pse tsc msr pae mce fpu de pse tsc msr pae mce -- --cx8 apic sep mtrr pge mca cmov cx8 apic sep mtrr pge mca cmov -- --pat pse36 clflush mmx fxsr sse pse36 clflush mmx fxsr sse -- --sse2 ss syscall nx lm sse2syscall nx lm -- --constant_tsc pni vmx ssse3 pni vmx -- --cx16 x2apic hypervisor cx16 x2apic popcnt hypervisor -- --lahf_lm vnmi ept lahf_lm vnmi ept-- So QEMU CPU misses: vme, pat, ss, constant_tsc, and ssse3 but has popcnt. A different host running Xen was also missing ss, constant_tsc, ssse3, and popct. But it had vme and pat and was working with the i386 iso. That sounds a bit like either vme or pat missing could cause the i386 build of llvmpipe to fail while the exact same cpuid configuration works with the amd64 version of llvmpipe. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1448985/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
Finally with a little help on debugging unity, I think I see what is going on. The obvious part seemed to be that compiz seems to fail starting. Which turns out to be LLVM-pipe bailing with an obscure error message: LLVM ERROR: Do not know how to split the result of this operator! This made me think about the emulated CPU, even more because Xen HVM guests do work with the i386 isos. And really this is the actual problem! So one quick work-around is to force qemu to use a different CPU type. In my test I used the Wily i386 iso and changed the CPU type from the default (QEMU Virtual CPU v2.0.0) into core2duo. And suddenly the live session works. So next, what is the difference. Beside of name, model, and stepping, it seems the cpuid flags: Core(TM)2 Duo CPU (emulated)QEMU Virtual CPU v2.0.0 model 15model 6 stepping 11 stepping 3 cpuid level 10 cpuid level 4 ore(TM)2 Duo CPU (emulated) QEMU Virtual CPU v2.0.0 model 15model 6 stepping 11 stepping 3 cpuid level 10 cpuid level 4 --fpu vme de pse tsc msr pae mce fpu de pse tsc msr pae mce -- --cx8 apic sep mtrr pge mca cmov cx8 apic sep mtrr pge mca cmov -- --pat pse36 clflush mmx fxsr sse pse36 clflush mmx fxsr sse -- --sse2 ss syscall nx lm sse2syscall nx lm -- --constant_tsc pni vmx ssse3 pni vmx -- --cx16 x2apic hypervisor cx16 x2apic popcnt hypervisor -- --lahf_lm vnmi ept lahf_lm vnmi ept-- So QEMU CPU misses: vme, pat, ss, constant_tsc, and ssse3 but has popcnt. A different host running Xen was also missing ss, constant_tsc, ssse3, and popct. But it had vme and pat and was working with the i386 iso. That sounds a bit like either vme or pat missing could cause the i386 build of llvmpipe to fail while the exact same cpuid configuration works with the amd64 version of llvmpipe. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1448985/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
Maybe not exactly the cpuid flags seen but in a weird way how qemu builds some structures. I have to dig more there. But it is strange that qemu64 (which is the default cpu type if nothing else is specified) is defined as something based on a AMD cpu, while all of qemu32, kvm64, and kvm32 use a Intel base. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1448985/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
Maybe not exactly the cpuid flags seen but in a weird way how qemu builds some structures. I have to dig more there. But it is strange that qemu64 (which is the default cpu type if nothing else is specified) is defined as something based on a AMD cpu, while all of qemu32, kvm64, and kvm32 use a Intel base. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1448985/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
Building from upstream allows me to get to get to the purple login screen when clicking 'Try Ubuntu' (not sure why it doesn't automatically login). So perhaps something has changed upstream? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1448985/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
Building from upstream allows me to get to get to the purple login screen when clicking 'Try Ubuntu' (not sure why it doesn't automatically login). So perhaps something has changed upstream? -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1448985/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
Bug exists with Ubuntu 12.04.5 LTS host and Ubuntu 15.10 alpha guest. ** Summary changed: - Ubuntu 14.04 LTS, 14.10, 15.04 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts + Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to qemu in Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1448985/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 1448985] Re: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts
Bug exists with Ubuntu 12.04.5 LTS host and Ubuntu 15.10 alpha guest. ** Summary changed: - Ubuntu 14.04 LTS, 14.10, 15.04 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts + Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1448985 Title: Ubuntu 14.04 LTS, 14.10, 15.04, 15.10 guests do not boot to Unity from QEMU-KVM Ubuntu 14.04 LTS, 14.10, 15.04 hosts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1448985/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
