linux-kernel - Re: [PATCH] x86/ACPI/boot: Use FADT version to check support for online capable

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Message-ID: <20230330084123.GBZCVLM8Wz8fBsKr7z@fat_crate.local>
Date:   Thu, 30 Mar 2023 10:41:23 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Zhang, Rui" <rui.zhang@...el.com>
Cc:     "Brown, Len" <len.brown@...el.com>, "pavel@....cz" <pavel@....cz>,
        "mario.limonciello@....com" <mario.limonciello@....com>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "eric.devolder@...cle.com" <eric.devolder@...cle.com>
Subject: Re: [PATCH] x86/ACPI/boot: Use FADT version to check support for
 online capable

On Thu, Mar 30, 2023 at 01:10:07AM +0000, Zhang, Rui wrote:
> In https://uefi.org/sites/default/files/resources/ACPI_6_2.pdf,
> MADT revision is 4.
> 
> In 
> https://uefi.org/sites/default/files/resources/ACPI%206_2_A_Sept29.pdf,
> MADT revision is 45.

This is a hack to fix some ACPI erratum or whatever.

> In 
> https://uefi.org/sites/default/files/resources/ACPI_6_2_B_final_Jan30.pdf
> MADT revision is 5.
> 
> So you probably mean 6.2a has MADT revision "45" here?

No, forget MADT.

The thing should check whether the ACPI revision is 6.3. And this is
what it does below.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette