[CentOS] kvm: C8 as guest on C6 host / huge delay while booting

Sat May 16 15:48:07 UTC 2020
Kay Diederichs <kay.diederichs at uni-konstanz.de>

On 5/16/20 5:09 PM, Leon Fauster via CentOS wrote:
> Am 11.05.20 um 15:59 schrieb Leon Fauster:
>> Since C8.1  kvm guests have a huge delay while booting on a kvm host based on C6. This delay was not present with C8.0. The "pause" happend
>> direct after the grub step. The VNC session shows only a "_" character.
>>
> 
> and this are the corresponding logs. The guest system continues to boot after ~5 minutes. At that point this appears
> 
> May 16 16:44:14 ev kernel: kvm: 8458: cpu0 unhandled rdmsr: 0x140
> May 16 16:44:14 ev kernel: kvm: 8458: cpu0 disabled perfctr wrmsr: 0xc2 data 0xffff
> May 16 16:44:14 ev kernel: kvm: 8458: cpu1 unhandled rdmsr: 0x140
> May 16 16:44:14 ev kernel: kvm: 8458: cpu2 unhandled rdmsr: 0x140
> May 16 16:44:14 ev kernel: kvm: 8458: cpu3 unhandled rdmsr: 0x140
> May 16 16:44:15 ev kernel: kvm: emulating exchange as write
> 
> Any ideas?
> 
> -- 
> Leon
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looks like a mismatch between the hardware that the KVM guest is told to use, and the actual hardware provided by the host.

You can change the CPU type that the guest expects.

HTH
Kay