Re: [PATCH 0/2] KVM: x86: Fix incorrect VM-exit profiling

Wei Zhang
2022-05-16T19:30:51Z

> Please don't top-post. From https://people.kernel.org/tglx/notes-about-netiquette:

Ah, I didn't know this should be avoided. Thanks for the info!

> My preference would be to find a more complete, KVM-specific solution. The
> profiling stuff seems like it's a dead end, i.e. will always be flawed in some
> way. If this cleanup didn't require a new hypercall then I wouldn't care, but
> I don't love having to extend KVM's guest/host ABI for something that ideally
> will become obsolete sooner than later.

I also feel that adding a new hypercall is too much here. A
KVM-specific solution is definitely better, and the eBPF based
approach you mentioned sounds like the ultimate solution (at least for
inspecting exit reasons).

+Suleiman What do you think? The on-going work Sean described sounds
promising, perhaps we should put this patch aside for the time being.