linux-kernel - Re: [External] Re: [PATCH v7 0/9] Parallel CPU bringup for x86

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Message-ID: <76b8560c940f4506a690152e91e2f030eb24f86e.camel@infradead.org>
Date:   Thu, 09 Feb 2023 13:48:36 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Usama Arif <usama.arif@...edance.com>, paulmck@...nel.org
Cc:     kim.phillips@....com, arjan@...ux.intel.com, mingo@...hat.com,
        bp@...en8.de, dave.hansen@...ux.intel.com, hpa@...or.com,
        x86@...nel.org, pbonzini@...hat.com, 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
Subject: Re: [External] Re: [PATCH v7 0/9] Parallel CPU bringup for x86_64

On Thu, 2023-02-09 at 12:10 +0000, David Woodhouse wrote:
> On Thu, 2023-02-09 at 12:53 +0100, Thomas Gleixner wrote:
> > On Thu, Feb 09 2023 at 11:03, David Woodhouse wrote:
> > > This one also fixes it for me. If we're happy with this approach, I'll
> > > work it into Thomas's original patch (and hopefully eventually he'll be
> > > happy enough with it and the commit message that he'll give us his
> > > Signed-off-by for it.)
> > 
> > I'm happy enough by now, but I'm not sure how much of the original patch
> > is still left. Also you did the heavy lifting of making it work and
> > writing the nice changelog. So please make this:
> > 
> > From: David Woodhouse <dwmw2@...radead.org>
> > 
> > Co-developed-by: Thomas Gleixner <tglx@...utronix.de>
> > Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> > Signed-off-by: David Woodhouse <dwmw2@...radead.org>
> 
> Thanks. I'll flip that to the Amazon address, of course. It's useless
> for actual email (until I apply that LART some more) but I should still
> use it for that.
> 
> I think I'm going to make one more change to that as I review it; in
> the "should never happen" case of not finding the APIC ID in the
> cpuid_to_apicid[] array it would just keep searching for ever. I don't
> know if there's a better thing to do other than just dropping the
> trampoline lock and 1:cli;hlt;jmp 1b but at least it's *attempting* to
> handle the failure.
> 
> Patch below, and I'll update the tree shortly. There's a "what if
> there's noise in the top 32 bits of %rcx" fix in there too.

All done and pushed out to parallel-6.2-rc7-part1 (and not -part1)
branches. Usama, are you able to redo the testing and take it from
here? Thanks for that; it's saving me a lot of time!


I'm mostly done for the week now as by this time tomorrow, I need to
have the skis on the roof of the car and be ready to pick the family up
from school and start driving south...

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