Re: [Qemu-discuss] qemu 2.8.50 Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed

[Bandan Das]

"Matwey V. Kornilov" <address@hidden> writes:

> 02.02.2017 22:36, Matwey V. Kornilov пишет:
>> 
>> 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.

I think this means that KVM gave you a list of msrs but
when you tried to set them, it could not set all of them and hence, the
assert triggers.

Are you using a modified kernel ? There could be something useful in the host
dmesg as well.

Bandan

>> 
>> 
>
>
> Hello, I've bisected the first bad commit:
>
>
> 48e1a45c3166d659f781171a47dabf4a187ed7a5 is the first bad commit
> 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>
>
> :040000 040000 5626b58f0d79261bbe8a4fb52bd2cc19c2aa86ad
> d7580353932acab9de5c3d024b3f1215eb5659dc M      target-i386