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

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Date:   Thu, 9 Feb 2023 14:01:16 +0000
From:   Usama Arif <usama.arif@...edance.com>
To:     David Woodhouse <dwmw2@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, 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 09/02/2023 13:48, David Woodhouse wrote:
> 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!
> 
Thanks! Will retest and repost now!

Usama

> 
> 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...