From: Will Deacon <will@kernel.org>
To: Qais Yousef <qais.yousef@arm.com>
Cc: "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
Marc Zyngier <maz@kernel.org>,
"kernel-team@android.com" <kernel-team@android.com>,
Peter Zijlstra <peterz@infradead.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Suren Baghdasaryan <surenb@google.com>,
Morten Rasmussen <Morten.Rasmussen@arm.com>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 2/6] arm64: Allow mismatched 32-bit EL0 support
Date: Mon, 9 Nov 2020 13:52:59 +0000 [thread overview]
Message-ID: <20201109135259.GA14526@willie-the-truck> (raw)
In-Reply-To: <20201106144835.q363ezyse4vc5kdg@e107158-lin.cambridge.arm.com>
On Fri, Nov 06, 2020 at 02:48:35PM +0000, Qais Yousef wrote:
> On 11/06/20 13:00, Will Deacon wrote:
> > On Fri, Nov 06, 2020 at 12:54:25PM +0000, Qais Yousef wrote:
> > > FWIW I have my v3 over here in case it's of any help. It solves the problem of
> > > HWCAP discovery when late AArch32 CPU is booted by populating boot_cpu_date
> > > with 32bit features then.
> > >
> > > git clone https://git.gitlab.arm.com/linux-arm/linux-qy.git -b asym-aarch32-upstream-v3 origin/asym-aarch32-upstream-v3
> >
> > Cheers, I've done something similar. I was hoping to post it today, but I've
> > been side-tracked with bug fixing this morning. The main headache I ended up
> > with was allowing late-onlining of 64-bit-only CPUs if all the boot CPUs
> > are 32-bit capable. What do you do in that case?
>
> Do you mean if CPUs 0-3 were 32bit capable and we boot with maxcpus=4 then
> attempt to bring the remaining 64bit-only cpus online later?
Right. I think we will refuse to online them. I'll post my attempt at
handling that shortly.
> Haven't tried that tbh. What symptoms do you expect to see? I can try it out.
> I'm off for the remainder of the day, but can spend few mins to run an
> experiment for sure.
No probs; I've been taking Friday afternoons off to burn holiday anyway, so
you didn't miss anything!
Will
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next prev parent reply other threads:[~2020-11-09 13:54 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-27 21:51 [PATCH 0/6] An alternative series for asymmetric AArch32 systems Will Deacon
2020-10-27 21:51 ` [PATCH 1/6] KVM: arm64: Handle Asymmetric " Will Deacon
2020-10-27 21:51 ` [PATCH 2/6] arm64: Allow mismatched 32-bit EL0 support Will Deacon
2020-10-28 11:12 ` Catalin Marinas
2020-10-28 11:17 ` Will Deacon
2020-10-28 11:22 ` Catalin Marinas
2020-10-28 11:23 ` Will Deacon
2020-10-28 11:49 ` Catalin Marinas
2020-10-28 12:40 ` Will Deacon
2020-10-28 18:56 ` Catalin Marinas
2020-10-29 22:20 ` Will Deacon
2020-10-30 11:18 ` Catalin Marinas
2020-10-30 16:13 ` Will Deacon
2020-11-02 11:44 ` Catalin Marinas
2020-11-05 21:38 ` Will Deacon
2020-11-06 12:54 ` Qais Yousef
2020-11-06 13:00 ` Will Deacon
2020-11-06 14:48 ` Qais Yousef
2020-11-09 13:52 ` Will Deacon [this message]
2020-11-11 16:27 ` Qais Yousef
2020-11-12 10:24 ` Will Deacon
2020-11-12 11:55 ` Qais Yousef
2020-11-12 16:49 ` Qais Yousef
2020-11-12 17:06 ` Marc Zyngier
2020-11-12 17:36 ` Qais Yousef
2020-11-12 17:44 ` Will Deacon
2020-11-12 17:36 ` Will Deacon
2020-11-13 10:45 ` Qais Yousef
2020-11-06 14:30 ` Catalin Marinas
2020-10-28 11:18 ` Catalin Marinas
2020-10-28 11:21 ` Will Deacon
2020-10-27 21:51 ` [PATCH 3/6] KVM: arm64: Kill 32-bit vCPUs on systems with mismatched " Will Deacon
2020-10-27 21:51 ` [PATCH 4/6] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs Will Deacon
2020-10-28 12:10 ` Catalin Marinas
2020-10-28 12:36 ` Will Deacon
2020-10-27 21:51 ` [PATCH 5/6] arm64: Advertise CPUs capable of running 32-bit applcations in sysfs Will Deacon
2020-10-28 8:37 ` Greg Kroah-Hartman
2020-10-28 9:51 ` Will Deacon
2020-10-28 12:15 ` Catalin Marinas
2020-10-28 12:27 ` Will Deacon
2020-10-28 15:14 ` Catalin Marinas
2020-10-28 15:35 ` Will Deacon
2020-10-27 21:51 ` [PATCH 6/6] arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 Will Deacon
2020-10-29 18:42 ` [PATCH 0/6] An alternative series for asymmetric AArch32 systems Suren Baghdasaryan
2020-10-29 22:17 ` Will Deacon
2020-10-30 16:16 ` Marc Zyngier
2020-10-30 16:24 ` Will Deacon
2020-10-30 17:04 ` Marc Zyngier
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