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Message-ID: <03fb7bc9e23245a0fe5e0fd5c373d950d1363a69.camel@infradead.org>
Subject: Re: [PATCH v16 3/8] cpu/hotplug: Add dynamic parallel bringup
 states before CPUHP_BRINGUP_CPU
From:   David Woodhouse <dwmw2@infradead.org>
To:     Thomas Gleixner <tglx@linutronix.de>,
        Usama Arif <usama.arif@bytedance.com>, kim.phillips@amd.com,
        brgerst@gmail.com
Cc:     piotrgorski@cachyos.org, oleksandr@natalenko.name,
        arjan@linux.intel.com, mingo@redhat.com, bp@alien8.de,
        dave.hansen@linux.intel.com, hpa@zytor.com, x86@kernel.org,
        pbonzini@redhat.com, paulmck@kernel.org,
        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,
        gpiccoli@igalia.com
Date:   Fri, 24 Mar 2023 00:06:53 +0000
In-Reply-To: <87y1nn6nc9.ffs@tglx>
References: <20230321194008.785922-1-usama.arif@bytedance.com>
         <20230321194008.785922-4-usama.arif@bytedance.com> <874jqb8588.ffs@tglx>
         <47150207bfb76bb98aff678cf7c91f245e9f5dd9.camel@infradead.org>
         <87y1nn6nc9.ffs@tglx>
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On Fri, 2023-03-24 at 00:48 +0100, Thomas Gleixner wrote:
> On Thu, Mar 23 2023 at 22:49, David Woodhouse wrote:
> > On Thu, 2023-03-23 at 23:36 +0100, Thomas Gleixner wrote:
> > > There is no point in special casing this. All architectures can invok=
e
> > > the CPUHP_BP_* states before CPUHP_BRINGUP_CPU for each to be brought=
 up
> > > CPU first. So this can be made unconditional and common exercised cod=
e.
> > >=20
> >=20
> > There were three paragraphs in the commit message explaining why I
> > didn't want to do that. It didn't work for x86 before I started, and I
> > haven't reviewed *every* other architecture to ensure that it will work
> > there. It was opt-in for a reason. :)
>=20
> I noticed myself before reading your reply :)
>=20
> > > Aside of that this dynamic state range is pretty pointless. There is
> > > really nothing dynamic here and there is no real good reason to have
> > > four dynamic parallel states just because.
> >=20
> > The original patch set did use more than one state; the plan to do
> > microcode updates in parallel does involve doing at least one more, I
> > believe.
>=20
> I don't think so. The micro code muck can completely serialize itself
> and does not need control CPU assistance if done right. If we go there
> we have to fix that mess and not just proliferatng it with moar duct tape=
.
>=20
> > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/*
> > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * Fully per AP serialized=
 bringup from here on. If the
> > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * architecture does no re=
gister the CPUHP_BP_PARALLEL_STARTUP
> > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 * state, this step sends =
the startup IPI first.
> > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 */
> >=20
> > Not sure I'd conceded that yet; the APs do their *own* bringup from
> > here, and that really ought to be able to run in parallel.
>=20
> Somewhere in the distance future once we've
>=20
> =C2=A0 1) sorted the mandatory synchronization points, e.g. TSC sync in t=
he
> =C2=A0=C2=A0=C2=A0=C2=A0 early bootup phase.

That's why we have four of them... :)

> =C2=A0 2) audited _all_ AP state callbacks that they are able to cope wit=
h
> =C2=A0=C2=A0=C2=A0=C2=A0 parallel bringup.
>=20
> =C2=A0=C2=A0=C2=A0=C2=A0 That's a long road as there are tons of assumpti=
ons about the
> =C2=A0=C2=A0=C2=A0=C2=A0 implicit CPU hotplug serialization in those call=
backs.
>=20
> =C2=A0=C2=A0=C2=A0=C2=A0 Just because it did not explode in your face yet=
 does not mean this
> =C2=A0=C2=A0=C2=A0=C2=A0 is safe.
>=20
> =C2=A0=C2=A0=C2=A0=C2=A0 I just looked at 10 randomly picked AP online ca=
llbacks and found 5
> =C2=A0=C2=A0=C2=A0=C2=A0 of them being not ready :)

Oh, it's totally hosed, absolutely. I don't think even my most
ambitious hacks had even tried it yet. But I want to, so I wasn't about
to add a comment saying the opposite.

But it's fine; removing the comment is the *least* of the work to be
done in making that bit actually work in parallel :)

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