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    SubjectRe: [PATCH v5 08/12] x86/smpboot.c: Wake up CPU0 via NMI instead of INITs
    On Wed, Jan 11, 2012 at 12:04 PM, Fenghua Yu <> wrote:
    > From: Fenghua Yu <>
    > Instead of waiting for STARTUP after INITs, BSP will execute
    > the BIOS boot-strap code which is not a desired behavior for
    > waking up BSP. To avoid the boot-strap code, wake up CPU0 by
    > NMI instead.
    > This works to wake up soft offlined CPU0 only. If CPU0 is hard offlined (i.e.
    > physically hot removed and then hot added), NMI won't wake it up. We'll change
    > this code in the future to wake up hard offlined CPU0 if real platform and
    > request are available.
    > AP is still waken up as before by INIT, INIT, STARTUP sequence.

    Would clearing IA32_APIC_BASE_MSR.BSP avoid calling the BIOS code when
    the cpu is brought back online? Setting that flag in another cpu that
    is still online might also allow suspend/resume to work.

    Brian Gerst

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