Re: [PATCH v2] KVM: arm64: Add tracepoint for MMIO accesses where ISV==0

Marc Zyngier
2023-10-27T10:12:04Z

On Thu, 26 Oct 2023 21:53:06 +0100,
Oliver Upton <oliver.upton@linux.dev> wrote:
>
> It is a pretty well known fact that KVM does not support MMIO emulation
> without valid instruction syndrome information (ESR_EL2.ISV == 0). The
> current kvm_pr_unimpl() is pretty useless, as it contains zero context
> to relate the event to a vCPU.
>
> Replace it with a precise tracepoint that dumps the relevant context
> so the user can make sense of what the guest is doing.
>
> Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

Acked-by: Marc Zyngier <maz@kernel.org>

Thanks for going the extra mile on this!

M.

--
Without deviation from the norm, progress is not possible.