Re: General KVM/QEMU VM debugging techniques

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On Fri, 1 Apr 2022 23:50:16 +0000
"Kallol Biswas [C]" <kallol.biswas@xxxxxxxxxxx> wrote:

> Hi,
>     We are observing a problem with CPU hotplug.
> 
> If secureboot option is enabled under UEFI  and then if we try to do CPU hotplug the VM crashes/just reboots.
> 
> No crash dump is generated, no panic message, just VM restarts. Issue seems like: 
> https://bugzilla.redhat.com/show_bug.cgi?id=1834250

CPU hotplug with SMM (for q35) was merged in QEMU-5.2
and unplug part in 6.0, you also need a matching OVMF build
to make it work. Later upto 6.2 (included) there were minor
fixes dealing with incorrect configs.

> What are the debugging techniques we can apply to halt the VM and examine what's going on?
> VM has been configured with crash dump.

I'd start with https://www.linux-kvm.org/page/Tracing

to find out when it goes south.

> Nucleodyne at Nutanix
> 408-718-8164
> 





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