[Bug 208091] vcpu1, guest rIP offset ignored wrmsr or rdmsr

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https://bugzilla.kernel.org/show_bug.cgi?id=208091

--- Comment #5 from Joris L. (commandline@protonmail.com) ---
(In reply to Sean Christopherson from comment #3)
> The "ignored {rd,wr}msr" output is expected when kvm.ignore_msrs=1, which is
> not the default.  Is that enabled for any particular reason?  Or maybe a
> better question is, what is it that you're trying to do and what, if any,
> errors are occurring?
> 
> E.g. in the first trace, it looks like you're advertising an Intel vCPU to
> the guest on top of AMD hardware.  That can be made to work, but it's not
> recommended.  Ignoring MSRs in that scenario is almost guaranteed to cause
> weirdness.

Thanks Sean. I am cleaning up this config. Will check.

This is indeed a Ryzen CPU with Qemu/Proxmox on top of it.
For GPU Passthrough to a VM the kvm.ignore_msrs=1 is often recommended.
I brief test shows the VM is not working properly without this parameter, even
when booting the VM with CPU:host.

br,

Joris

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