linux-kernel - Re: [PATCH v6 1/1] x86/acpi, x86/boot: Add multiprocessor wake-up support

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Date:   Tue, 8 Jun 2021 16:19:45 -0700
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Rafael J Wysocki <rjw@...ysocki.net>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>, Len Brown <lenb@...nel.org>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v6 1/1] x86/acpi, x86/boot: Add multiprocessor wake-up
 support



On 6/1/21 10:36 AM, Rafael J. Wysocki wrote:
>> As per ACPI specification r6.4, sec 5.2.12.19, a new sub
>> structure – multiprocessor wake-up structure - is added to the
>> ACPI Multiple APIC Description Table (MADT) to describe the
>> information of the mailbox. If a platform firmware produces the
>> multiprocessor wake-up structure, then OS may use this new
>> mailbox-based mechanism to wake up the APs.
>>
>> Add ACPI MADT wake table parsing support for x86 platform and if
>> MADT wake table is present, update apic->wakeup_secondary_cpu with
>> new API which uses MADT wake mailbox to wake-up CPU.
>>
>> Co-developed-by: Sean Christopherson<sean.j.christopherson@...el.com>
>> Signed-off-by: Sean Christopherson<sean.j.christopherson@...el.com>
>> Signed-off-by: Kuppuswamy Sathyanarayanan<sathyanarayanan.kuppuswamy@...ux.intel.com>
>> Reviewed-by: Andi Kleen<ak@...ux.intel.com>
> All of my comments have been addressed, so
> 
> Reviewed-by: Rafael J. Wysocki<rafael.j.wysocki@...el.com>

Thomas/Peter Z,

Gentle ping. Any comments?

> 

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer