linux-kernel - Re: [PATCH v6 07/11] x86/smpboot: Disable parallel boot for AMD CPUs

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Message-ID: <5ba476f3-e0ac-d630-ce1d-18ab9885496f@linux.intel.com>
Date:   Sat, 4 Feb 2023 10:18:55 -0800
From:   Arjan van de Ven <arjan@...ux.intel.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Kim Phillips <kim.phillips@....com>,
        Usama Arif <usama.arif@...edance.com>, tglx@...utronix.de
Cc:     mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        hpa@...or.com, x86@...nel.org, pbonzini@...hat.com,
        paulmck@...nel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, rcu@...r.kernel.org, mimoja@...oja.de,
        hewenliang4@...wei.com, thomas.lendacky@....com, seanjc@...gle.com,
        pmenzel@...gen.mpg.de, fam.zheng@...edance.com,
        punit.agrawal@...edance.com, simon.evans@...edance.com,
        liangma@...ngbit.com, Mario Limonciello <Mario.Limonciello@....com>
Subject: Re: [PATCH v6 07/11] x86/smpboot: Disable parallel boot for AMD CPUs

> 
> However...
> 
> Even though we *can* support non-X2APIC processors, we *might* want to
> play it safe and not go back that far; only enabling parallel bringup
> on machines with X2APIC which roughly correlates with "lots of CPUs"
> since that's where the benefit is.

I think that this is the right approach, at least on the initial patch series.
KISS principle; do all the easy-but-important cases first, get it stable and working
and in later series/kernels the range can be expanded.... if it matters.


> 
> 
>