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

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Date:   Thu, 30 Mar 2023 09:29:01 +0000
From:   "Zhang, Rui" <rui.zhang@...el.com>
To:     "bp@...en8.de" <bp@...en8.de>
CC:     "Brown, Len" <len.brown@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "rafael@...nel.org" <rafael@...nel.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "pavel@....cz" <pavel@....cz>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "mario.limonciello@....com" <mario.limonciello@....com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...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, 2023-03-30 at 10:41 +0200, Borislav Petkov wrote:
> 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.

Yes, I agree.
As the original changelog mentioned that "ACPI spec 6.2b has MADT
revision 45", I was just checking if that statement is accurate or not.

thanks,
rui