Re: [PATCH v2 2/3] docs/cpu-features: Update "PAuth" (Pointer Authentication) details

[Kashyap Chamarthy <kchamart@redhat.com>]

On Tue, Feb 18, 2025 at 11:34:38AM +0000, Peter Maydell wrote:
> On Tue, 18 Feb 2025 at 11:29, Kashyap Chamarthy <kchamart@redhat.com> wrote:

[...]

> > > Maybe we shall
> > > - rename KVM vCPU Features -> KVM only vCPU Features
> > > - Add a TCG only vCPU features including both SME and RME ones
> > > - introduce a top level KVM and TCG vCPU features with below:
> > > PAUTH, SVE, detailing potential different semantic for both KVM and TCG mode
> >
> > Yeah, it can be done.  Would you be okay if I do it as a follow-up?  As
> > this a re-work of the entire doc with several features.
> 
> I think personally I would favour not having the split of
> "KVM only", "TCG only", etc sections. Instead document
> all of the properties in the same format, and have each
> property say whether it is TCG-specific, KVM-specific, etc.
> 
> Some of these properties may at some point in the future
> change, after all -- SME is currently TCG only but may get
> support in KVM and HVF in future; "aarch64" is currently
> KVM only but we might some day support it in TCG.

I agree.  As the PAuth case demonstrated, it only makes sense to
entirely do away with KVM- and TCG-specific sections and use a
consistent format througout.  That way, no need to remember to update
outdated sections.  It's also consistent with the x86 docs[1], where we
don't draw attention to KVM- or TCG-specific features.

I can rework the doc and send a follow-up.  (Eric: I assume you're also
fine with Peter's suggestion above :))

[1] https://www.qemu.org/docs/master/system/i386/cpu.html

-- 
/kashyap