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Re: [XEN PATCH v5] x86/intel: optional build of PSR support
- To: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 23 Sep 2024 17:01:00 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 23 Sep 2024 15:01:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.09.2024 11:15, Sergiy Kibrik wrote:
> changes in v5:
> - simplify psr_cmt_enabled()
> - move PSR config option and add description
What you did is not so much add a description, but ...
> --- a/xen/arch/x86/Kconfig
> +++ b/xen/arch/x86/Kconfig
> @@ -231,6 +231,9 @@ config TBOOT
>
> If unsure, stay with the default.
>
> +config PSR
> + bool "Platform Shared Resource support"
... add a prompt. With a prompt, it also wants to have help text. And with
a prompt the question then is why ...
> --- a/xen/arch/x86/Kconfig.cpu
> +++ b/xen/arch/x86/Kconfig.cpu
> @@ -13,6 +13,7 @@ config AMD
> config INTEL
> bool "Support Intel CPUs"
> default y
> + select PSR
... INTEL=y uniformly forces it on, while for INTEL=n (where it's useless)
it can be manually set to on. Imo, if you permit user configurability (as
was asked for), then it wants to be
config PSR
bool "Platform Shared Resource support"
default INTEL
Further: For an acronym like PSR I consider it reasonably likely that
something similarly abbreviated may appear in common code. I wonder if we
weren't better off naming this X86_PSR right away. (Likely this would
extend to various other settings as well that we gained more or less
recently.)
Jan
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