Message-ID: <76b8560c940f4506a690152e91e2f030eb24f86e.camel@infradead.org>
Subject: Re: [External] Re: [PATCH v7 0/9] Parallel CPU bringup for x86_64
From:   David Woodhouse <dwmw2@infradead.org>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Usama Arif <usama.arif@bytedance.com>, paulmck@kernel.org
Cc:     kim.phillips@amd.com, arjan@linux.intel.com, mingo@redhat.com,
        bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com,
        x86@kernel.org, pbonzini@redhat.com, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org, rcu@vger.kernel.org, mimoja@mimoja.de,
        hewenliang4@huawei.com, thomas.lendacky@amd.com, seanjc@google.com,
        pmenzel@molgen.mpg.de, fam.zheng@bytedance.com,
        punit.agrawal@bytedance.com, simon.evans@bytedance.com,
        liangma@liangbit.com
Date:   Thu, 09 Feb 2023 13:48:36 +0000
In-Reply-To: <eea887fb7d634c24529743fce8295b2f78eb861d.camel@infradead.org>
References: <20230207230436.2690891-1-usama.arif@bytedance.com>
         <20230209035300.GA3216394@paulmck-ThinkPad-P17-Gen-1>
         <8e2f03e2-9517-aeb4-df60-b36ef3ff3a75@bytedance.com>
         <f07b371ae2eb11f541c665b488b3d4b6bf1a81b3.camel@infradead.org>
         <87357f2gyd.ffs@tglx>
         <eea887fb7d634c24529743fce8295b2f78eb861d.camel@infradead.org>
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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'l=
l
> > > 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.)
> >=20
> > I'm happy enough by now, but I'm not sure how much of the original patc=
h
> > is still left. Also you did the heavy lifting of making it work and
> > writing the nice changelog. So please make this:
> >=20
> > From: David Woodhouse <dwmw2@infradead.org>
> >=20
> > Co-developed-by: Thomas Gleixner <tglx@linutronix.de>
> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> > Signed-off-by: David Woodhouse <dwmw2@infradead.org>
>=20
> 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.
>=20
> 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.
>=20
> 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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