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Re: [PATCH v4] xen/x86: public: add TSC defines for cpuid leaf 4
- To: Krister Johansen <kjlx@xxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 31 Jan 2023 09:42:38 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, David Reaver <me@xxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 31 Jan 2023 08:43:12 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.01.2023 18:44, Krister Johansen wrote:
> Cpuid leaf 4 contains information about how the state of the tsc, its
> mode, and some additional information. A commit that is queued for
> linux would like to use this to determine whether the tsc mode has been
> set to 'no emulation' in order to make some decisions about which
> clocksource is more reliable.
>
> Expose this information in the public API headers so that they can
> subsequently be imported into linux and used there.
>
> Link:
> https://lore.kernel.org/xen-devel/eda8d9f2-3013-1b68-0df8-64d7f13ee35e@xxxxxxxx/
> Link:
> https://lore.kernel.org/xen-devel/0835453d-9617-48d5-b2dc-77a2ac298bad@xxxxxxxxxx/
> Signed-off-by: Krister Johansen <kjlx@xxxxxxxxxxxxxxxxxx>
As said:
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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