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Re: [PATCH 1/2] x86/cpuid: Infrastructure to support pseudo feature identifiers
- To: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Wed, 5 Oct 2022 15:53:19 +0200
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, Henry Wang <Henry.Wang@xxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 05 Oct 2022 13:53:41 +0000
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On Wed, Oct 05, 2022 at 01:34:06PM +0000, Andrew Cooper wrote:
> On 05/10/2022 10:55, Roger Pau Monné wrote:
> > On Tue, Oct 04, 2022 at 05:08:09PM +0100, Andrew Cooper wrote:
> >> A future change will want a cpuid-like identifier which doesn't have a
> >> mapping
> >> to a feature bit.
> > Why we prefer this logic over just giving such pseudo features a
> > synthetic bit or akin?
>
> Synthetic bits are (intentionally) not available to cmdline parsing. We
> need something that is available for parsing.
I think Jan expressed my view better, in that it would be nicer to
just have the MSR_ARCH_CAPS bits in the featureset, and listed in
cpufeatureset.h like we handle CPUID features.
Maybe we want to go your proposed route now if that's easier however.
Thanks, Roger.
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