Re: [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed

[Matwey V. Kornilov]

Hello,

The output is the following:

kvm_msr_entry_add: @0 index=174 value=0
kvm_msr_entry_add: @1 index=175 value=0
kvm_msr_entry_add: @2 index=176 value=0
kvm_msr_entry_add: @3 index=277 value=7040600070406
kvm_msr_entry_add: @4 index=c0000081 value=0
kvm_msr_entry_add: @5 index=c0010117 value=0
kvm_msr_entry_add: @6 index=3b value=0
kvm_msr_entry_add: @7 index=1a0 value=1
kvm_msr_entry_add: @8 index=c0000083 value=0
kvm_msr_entry_add: @9 index=c0000102 value=0
kvm_msr_entry_add: @10 index=c0000084 value=0
kvm_msr_entry_add: @11 index=c0000082 value=0
kvm_msr_entry_add: @12 index=10 value=0
kvm_msr_entry_add: @13 index=12 value=0
kvm_msr_entry_add: @14 index=11 value=0
kvm_msr_entry_add: @15 index=4b564d02 value=0
kvm_msr_entry_add: @16 index=4b564d04 value=0
kvm_msr_entry_add: @17 index=4b564d03 value=0
kvm_msr_entry_add: @18 index=38d value=0
kvm_msr_entry_add: @19 index=38f value=0
kvm_msr_entry_add: @20 index=309 value=0
kvm_msr_entry_add: @21 index=30a value=0
kvm_msr_entry_add: @22 index=30b value=0
kvm_msr_entry_add: @23 index=c1 value=0
kvm_msr_entry_add: @24 index=186 value=0
kvm_msr_entry_add: @25 index=c2 value=0
kvm_msr_entry_add: @26 index=187 value=0
kvm_msr_entry_add: @27 index=c3 value=0
kvm_msr_entry_add: @28 index=188 value=0
kvm_msr_entry_add: @29 index=c4 value=0
kvm_msr_entry_add: @30 index=189 value=0
kvm_msr_entry_add: @31 index=38e value=0
kvm_msr_entry_add: @32 index=390 value=0
kvm_msr_entry_add: @33 index=38d value=0
kvm_msr_entry_add: @34 index=38f value=0
kvm_msr_entry_add: @35 index=2ff value=0
kvm_msr_entry_add: @36 index=250 value=0
kvm_msr_entry_add: @37 index=258 value=0
kvm_msr_entry_add: @38 index=259 value=0
kvm_msr_entry_add: @39 index=268 value=0
kvm_msr_entry_add: @40 index=269 value=0
kvm_msr_entry_add: @41 index=26a value=0
kvm_msr_entry_add: @42 index=26b value=0
kvm_msr_entry_add: @43 index=26c value=0
kvm_msr_entry_add: @44 index=26d value=0
kvm_msr_entry_add: @45 index=26e value=0
kvm_msr_entry_add: @46 index=26f value=0
kvm_msr_entry_add: @47 index=200 value=0
kvm_msr_entry_add: @48 index=201 value=0
kvm_msr_entry_add: @49 index=202 value=0
kvm_msr_entry_add: @50 index=203 value=0
kvm_msr_entry_add: @51 index=204 value=0
kvm_msr_entry_add: @52 index=205 value=0
kvm_msr_entry_add: @53 index=206 value=0
kvm_msr_entry_add: @54 index=207 value=0
kvm_msr_entry_add: @55 index=208 value=0
kvm_msr_entry_add: @56 index=209 value=0
kvm_msr_entry_add: @57 index=20a value=0
kvm_msr_entry_add: @58 index=20b value=0
kvm_msr_entry_add: @59 index=20c value=0
kvm_msr_entry_add: @60 index=20d value=0
kvm_msr_entry_add: @61 index=20e value=0
kvm_msr_entry_add: @62 index=20f value=0
kvm_msr_entry_add: @63 index=17a value=0
kvm_msr_entry_add: @64 index=17b value=ffffffffffffffff
kvm_msr_entry_add: @65 index=400 value=ffffffffffffffff
kvm_msr_entry_add: @66 index=401 value=0
kvm_msr_entry_add: @67 index=402 value=0
kvm_msr_entry_add: @68 index=403 value=0
kvm_msr_entry_add: @69 index=404 value=ffffffffffffffff
kvm_msr_entry_add: @70 index=405 value=0
kvm_msr_entry_add: @71 index=406 value=0
kvm_msr_entry_add: @72 index=407 value=0
kvm_msr_entry_add: @73 index=408 value=ffffffffffffffff
kvm_msr_entry_add: @74 index=409 value=0
kvm_msr_entry_add: @75 index=40a value=0
kvm_msr_entry_add: @76 index=40b value=0
kvm_msr_entry_add: @77 index=40c value=ffffffffffffffff
kvm_msr_entry_add: @78 index=40d value=0
kvm_msr_entry_add: @79 index=40e value=0
kvm_msr_entry_add: @80 index=40f value=0
kvm_msr_entry_add: @81 index=410 value=ffffffffffffffff
kvm_msr_entry_add: @82 index=411 value=0
kvm_msr_entry_add: @83 index=412 value=0
kvm_msr_entry_add: @84 index=413 value=0
kvm_msr_entry_add: @85 index=414 value=ffffffffffffffff
kvm_msr_entry_add: @86 index=415 value=0
kvm_msr_entry_add: @87 index=416 value=0
kvm_msr_entry_add: @88 index=417 value=0
kvm_msr_entry_add: @89 index=418 value=ffffffffffffffff
kvm_msr_entry_add: @90 index=419 value=0
kvm_msr_entry_add: @91 index=41a value=0
kvm_msr_entry_add: @92 index=41b value=0
kvm_msr_entry_add: @93 index=41c value=ffffffffffffffff
kvm_msr_entry_add: @94 index=41d value=0
kvm_msr_entry_add: @95 index=41e value=0
kvm_msr_entry_add: @96 index=41f value=0
kvm_msr_entry_add: @97 index=420 value=ffffffffffffffff
kvm_msr_entry_add: @98 index=421 value=0
kvm_msr_entry_add: @99 index=422 value=0
kvm_msr_entry_add: @100 index=423 value=0
kvm_msr_entry_add: @101 index=424 value=ffffffffffffffff
kvm_msr_entry_add: @102 index=425 value=0
kvm_msr_entry_add: @103 index=426 value=0
kvm_msr_entry_add: @104 index=427 value=0
kvm_put_msrs: ret=18 expected=105
qemu-system-x86_64: /home/matwey/lab/qemu/target/i386/kvm.c:1852:
kvm_put_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.

2017-02-03 15:57 GMT+03:00 Dr. David Alan Gilbert <address@hidden>:
> Hi Matwey,
>   That shouldn't happen!  The patch you've bisected to is just the one that 
> complains if the ioctl fails rather than silently ignoring the failure - it 
> means the failure probably previously existed and was ignored and that causes 
> random other problems.
>
> What kernel are you using on the host?
>
> We need to figure out which MSR it's objecting to; probably the easiest
> way is to :
>
> 1) Edit mvm_msr_entry_add in target/i386/kvm.c to something like:
>
>     assert((void *)(entry + 1) <= limit);
>     fprintf(stderr,"kvm_msr_entry_add: @%d index=%x value=%lx\n", 
> msrs->nmsrs, index, value);
>     entry->index = index;
>
> 2) edit kvm_put_msrs near the bottom:
>
>     fprintf(stderr,"kvm_put_msrs: ret=%d expected=%d\n", ret, 
> cpu->kvm_msr_buf->nmsrs);
>     assert(ret == cpu->kvm_msr_buf->nmsrs);
>
> Now with any luck the 'ret' value will tell you the entry which is bad, and 
> you can match
> that to the @%d value (or maybe it's the entry before that one which failed?) 
> then we get the index, look it up in the intel docs and figure out which MSR 
> it's complaining about.
>
> Dave
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1661386
>
> Title:
>   Assertion `ret == 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=kvm -nodefaults
>   -no-reboot -nographic -cpu host -vga none  -kernel .build.kernel.kvm
>   -initrd .build.initrd.kvm -append 'panic=1 no-kvmclock console=ttyS0
>   loglevel=7' -m 1024 -serial stdio
>   qemu-system-x86_64: /home/matwey/lab/qemu/target/i386/kvm.c:1849:
>   kvm_put_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.
>
>   First broken commit has been bisected:
>
>   commit 48e1a45c3166d659f781171a47dabf4a187ed7a5
>   Author: Paolo Bonzini <address@hidden>
>   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 <address@hidden>
>
>   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 lm 
> constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc 
> aperfmperf 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


-- 
With best regards,
Matwey V. Kornilov
http://blog.matwey.name
xmpp://address@hidden

-- 
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https://bugs.launchpad.net/bugs/1661386

Title:
  Assertion `ret == 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=kvm -nodefaults
  -no-reboot -nographic -cpu host -vga none  -kernel .build.kernel.kvm
  -initrd .build.initrd.kvm -append 'panic=1 no-kvmclock console=ttyS0
  loglevel=7' -m 1024 -serial stdio
  qemu-system-x86_64: /home/matwey/lab/qemu/target/i386/kvm.c:1849:
  kvm_put_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.

  First broken commit has been bisected:

  commit 48e1a45c3166d659f781171a47dabf4a187ed7a5
  Author: Paolo Bonzini <address@hidden>
  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 <address@hidden>

  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 lm 
constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc 
aperfmperf 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