Re: [PATCH v8] qapi: introduce 'query-kvm-cpuid' action

[Eduardo Habkost]

On Wed, Jun 02, 2021 at 03:51:02PM -0500, Eric Blake wrote:
> On Mon, May 31, 2021 at 03:38:06PM +0300, Valeriy Vdovin wrote:
[...]
> > +##
> > +# @CpuidEntry:
> > +#
> > +# A single entry of a CPUID response.
> > +#
> > +# One entry holds full set of information (leaf) returned to the guest in 
> > response
> > +# to it calling a CPUID instruction with eax, ecx used as the agruments to 
> > that
> 
> arguments
> 
> > +# instruction. ecx is an optional argument as not all of the leaves 
> > support it.
> 
> Is there a default value of ecx for when it is not provided by the
> user but needed by the leaf?  Or is it an error if ecx is omitted in
> that case?  Similarly, is it an error if ecx is provided but not
> needed?

What does "not provided by the user" mean here?  This is not
describing the input to a QMP command, but the input to the CPUID
instruction.

-- 
Eduardo