On Wed, Jun 16, 2021 at 06:00:09AM -0500, Brijesh Singh wrote:

I am trying to be consistent with previous VMGEXIT implementations. If
the command itself failed then use the command specific error code to
tell hypervisor why we terminated but if the hypervisor violated the
GHCB specification then use the "general request termination".

I feel like we're running in circles here: I ask about debuggability
and telling the user what exactly failed and you're giving me some
explanation about what the error codes mean. I can see what they mean.

So let me try again:

Imagine you're a guest owner and you haven't written the SNP code and
you don't know how it works.

You start a guest in the public cloud and it fails because the
hypervisor violates the GHCB protocol and all that guest prints before
it dies is

"general request termination"

How are you - the guest owner - going to find out what exactly happened?

Call support?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette