linux-kernel - Re: [PATCH v4] acpi/processor: sanitize _OSC/

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Date:   Thu, 2 Nov 2023 13:39:35 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Jason Andryuk <jandryuk@...il.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
Cc:     michal.wilczynski@...el.com,
        Roger Pau Monne <roger.pau@...rix.com>,
        stable@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v4] acpi/processor: sanitize _OSC/_PDC capabilities for
 Xen dom0

On 01.11.23 14:41, Jason Andryuk wrote:
> From: Roger Pau Monne <roger.pau@...rix.com>
> 
> The Processor capability bits notify ACPI of the OS capabilities, and
> so ACPI can adjust the return of other Processor methods taking the OS
> capabilities into account.
> 
> When Linux is running as a Xen dom0, the hypervisor is the entity
> in charge of processor power management, and hence Xen needs to make
> sure the capabilities reported by _OSC/_PDC match the capabilities of
> the driver in Xen.
> 
> Introduce a small helper to sanitize the buffer when running as Xen
> dom0.
> 
> When Xen supports HWP, this serves as the equivalent of commit
> a21211672c9a ("ACPI / processor: Request native thermal interrupt
> handling via _OSC") to avoid SMM crashes.  Xen will set bit
> ACPI_PROC_CAP_COLLAB_PROC_PERF (bit 12) in the capability bits and the
> _OSC/_PDC call will apply it.
> 
> [ jandryuk: Mention Xen HWP's need.  Support _OSC & _PDC ]
> Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>
> Cc: stable@...r.kernel.org
> Signed-off-by: Jason Andryuk <jandryuk@...il.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen


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