From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46302) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cb8DO-0006rQ-AV for qemu-devel@nongnu.org; Tue, 07 Feb 2017 11:02:03 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cb8DJ-00080e-Fx for qemu-devel@nongnu.org; Tue, 07 Feb 2017 11:01:58 -0500 Received: from indium.canonical.com ([91.189.90.7]:36230) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cb8DJ-000805-7m for qemu-devel@nongnu.org; Tue, 07 Feb 2017 11:01:53 -0500 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.76 #1 (Debian)) id 1cb8DG-0002YZ-0e for ; Tue, 07 Feb 2017 16:01:50 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 877782E80E3 for ; Tue, 7 Feb 2017 16:01:46 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Tue, 07 Feb 2017 15:50:04 -0000 From: "Matwey V. Kornilov" Reply-To: Bug 1661386 <1661386@bugs.launchpad.net> Sender: bounces@canonical.com References: <20170202204510.26617.69309.malonedeb@wampee.canonical.com> <20170206180523.5557.56952.malone@wampee.canonical.com> Message-Id: Errors-To: bounces@canonical.com Subject: Re: [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org 2017-02-06 22:38 GMT+03:00 Matwey V. Kornilov : > 2017-02-06 21:05 GMT+03:00 Dr. David Alan Gilbert : >>>> So you didn't mention this was running inside VMWare; it looks to me a= s if that's rejecting the PMU MSR accesses. >>>> For reference which version of VMWare are you using? >> >>>ESXi 6.0.0 Build 2494585 >> >>>I also find that enabling perf counters in VMWare configuration also >> helps. >> >> OK, so that suggests the problem is that with PMU disabled in VMWare >> config, it's not giving the right info to the guest to know it's >> disabled. > > How should it provide info? Can we check it? > Hi, I've found the following doc: https://software.intel.com/sites/default/files/m/5/2/c/f/1/30320 -Nehalem-PMU-Programming-Guide-Core.pdf I am not sure how up-to-date it is. Does qemu follow recommendations from secton 4.3? I use msr-tools package and rdmsr tool to check some registers from table 2= 6... IA32_MISC_ENABLE =3D 0 IA32_PERF_CAPABILITIES =3D 0 in my case. >> >>>But why did it just work before 48e1a45c3166 with perf counters >> disabled? >> >> Before that bug it ignored the failure to write/read the PMU MSRs - but >> also lost all the MSRs after the PMU access and we'd found that if we >> ever had that happen we'd get lots of weird bugs related to the other >> MSRs. >> >>>> >>>> My colleague suggested that '-cpu host,pmu=3Doff' might work instead = of >>>> having to hack around with the source. >> >>> Indeed, this also helps. >> >> -- >> You received this bug notification because you are subscribed to the bug >> report. >> https://bugs.launchpad.net/bugs/1661386 >> >> Title: >> Assertion `ret =3D=3D cpu->kvm_msr_buf->nmsrs' failed >> >> Status in QEMU: >> New >> >> Bug description: >> Hello, >> >> >> I see the following when try to run qemu from master as the following: >> >> # ./x86_64-softmmu/qemu-system-x86_64 --version >> QEMU emulator version 2.8.50 (v2.8.0-1006-g4e9f524) >> Copyright (c) 2003-2016 Fabrice Bellard and the QEMU Project developers >> # ./x86_64-softmmu/qemu-system-x86_64 -machine accel=3Dkvm -nodefaults >> -no-reboot -nographic -cpu host -vga none -kernel .build.kernel.kvm >> -initrd .build.initrd.kvm -append 'panic=3D1 no-kvmclock console=3Dtty= S0 >> loglevel=3D7' -m 1024 -serial stdio >> qemu-system-x86_64: /home/matwey/lab/qemu/target/i386/kvm.c:1849: >> kvm_put_msrs: Assertion `ret =3D=3D cpu->kvm_msr_buf->nmsrs' failed. >> >> First broken commit has been bisected: >> >> commit 48e1a45c3166d659f781171a47dabf4a187ed7a5 >> Author: Paolo Bonzini >> Date: Wed Mar 30 22:55:29 2016 +0200 >> >> target-i386: assert that KVM_GET/SET_MSRS can set all requested MS= Rs >> >> This would have caught the bug in the previous patch. >> >> Signed-off-by: Paolo Bonzini >> >> My cpuinfo is the following: >> >> processor : 0 >> vendor_id : GenuineIntel >> cpu family : 6 >> model : 44 >> model name : Intel(R) Xeon(R) CPU X5675 @ 3.07GHz >> stepping : 2 >> microcode : 0x14 >> cpu MHz : 3066.775 >> cache size : 12288 KB >> physical id : 0 >> siblings : 2 >> core id : 0 >> cpu cores : 2 >> apicid : 0 >> initial apicid : 0 >> fpu : yes >> fpu_exception : yes >> cpuid level : 11 >> wp : yes >> flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge= mca cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp l= m constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_ts= c aperfmperf pni pclmulqdq vmx ssse3 cx16 sse4_1 sse4_2 popcnt aes hypervis= or lahf_lm ida arat epb dtherm tpr_shadow vnmi ept vpid >> bugs : >> bogomips : 6133.55 >> clflush size : 64 >> cache_alignment : 64 >> address sizes : 40 bits physical, 48 bits virtual >> power management: >> >> To manage notifications about this bug go to: >> https://bugs.launchpad.net/qemu/+bug/1661386/+subscriptions > > > > -- > With best regards, > Matwey V. Kornilov > http://blog.matwey.name > xmpp://0x2207@jabber.ru -- = With best regards, Matwey V. Kornilov http://blog.matwey.name xmpp://0x2207@jabber.ru -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1661386 Title: Assertion `ret =3D=3D cpu->kvm_msr_buf->nmsrs' failed Status in QEMU: New Bug description: Hello, = I see the following when try to run qemu from master as the following: # ./x86_64-softmmu/qemu-system-x86_64 --version QEMU emulator version 2.8.50 (v2.8.0-1006-g4e9f524) Copyright (c) 2003-2016 Fabrice Bellard and the QEMU Project developers # ./x86_64-softmmu/qemu-system-x86_64 -machine accel=3Dkvm -nodefaults -no-reboot -nographic -cpu host -vga none -kernel .build.kernel.kvm -initrd .build.initrd.kvm -append 'panic=3D1 no-kvmclock console=3DttyS0 loglevel=3D7' -m 1024 -serial stdio qemu-system-x86_64: /home/matwey/lab/qemu/target/i386/kvm.c:1849: kvm_put_msrs: Assertion `ret =3D=3D cpu->kvm_msr_buf->nmsrs' failed. First broken commit has been bisected: commit 48e1a45c3166d659f781171a47dabf4a187ed7a5 Author: Paolo Bonzini Date: Wed Mar 30 22:55:29 2016 +0200 target-i386: assert that KVM_GET/SET_MSRS can set all requested MSRs = This would have caught the bug in the previous patch. = Signed-off-by: Paolo Bonzini My cpuinfo is the following: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 44 model name : Intel(R) Xeon(R) CPU X5675 @ 3.07GHz stepping : 2 microcode : 0x14 cpu MHz : 3066.775 cache size : 12288 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 11 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mc= a cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm c= onstant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc a= perfmperf pni pclmulqdq vmx ssse3 cx16 sse4_1 sse4_2 popcnt aes hypervisor = lahf_lm ida arat epb dtherm tpr_shadow vnmi ept vpid bugs : bogomips : 6133.55 clflush size : 64 cache_alignment : 64 address sizes : 40 bits physical, 48 bits virtual power management: To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1661386/+subscriptions