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From: Peter Maydell <peter.maydell@linaro.org>
To: Alexander Graf <agraf@csgraf.de>
Cc: Eduardo Habkost <ehabkost@redhat.com>,
	Richard Henderson <richard.henderson@linaro.org>,
	QEMU Developers <qemu-devel@nongnu.org>,
	Cameron Esfahani <dirty@apple.com>,
	Roman Bolshakov <r.bolshakov@yadro.com>,
	qemu-arm <qemu-arm@nongnu.org>, Frank Yang <lfy@google.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Peter Collingbourne <pcc@google.com>
Subject: Re: [PATCH v6 11/11] hvf: arm: Implement -cpu host
Date: Sun, 16 May 2021 17:12:44 +0100	[thread overview]
Message-ID: <CAFEAcA9zdJeNgeSihuXt4Cc9-yNDDE+Apkx-S8PBwnFidnxoRA@mail.gmail.com> (raw)
In-Reply-To: <223c7fbc-3a07-e97c-04eb-ef38ec3d67fe@csgraf.de>

On Sun, 16 May 2021 at 12:16, Alexander Graf <agraf@csgraf.de> wrote:
>
>
> On 28.01.21 17:55, Peter Maydell wrote:
> > Nicer to follow the KVM approach of only doing this once
> > and caching the results in arm_host_cpu_features, so that
> > for a many-cores VM you don't do it once per core.
>
>
> I tend to disagree. This scales nicely with the number of cores you have
> in the system and it's blazingly fast :). I would rather like to
> optimize for simplicity here.

How does "do something once per vCPU" scale better than
"do something once when QEMU starts" ??

I would prefer to optimise for "don't be unnecessarily
different from how we do stuff with KVM", please.

thanks
-- PMM


  reply	other threads:[~2021-05-16 16:16 UTC|newest]

Thread overview: 45+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-20 22:44 [PATCH v6 00/11] hvf: Implement Apple Silicon Support Alexander Graf
2021-01-20 22:44 ` [PATCH v6 01/11] hvf: Add hypervisor entitlement to output binaries Alexander Graf
2021-02-23 11:56   ` Akihiko Odaki
2021-02-23 15:07     ` Paolo Bonzini
2021-02-25  0:06       ` [PATCH] hvf: Sign the code after installation Akihiko Odaki
2021-02-25 13:48         ` Paolo Bonzini
2021-02-26  4:58           ` Akihiko Odaki
2021-01-20 22:44 ` [PATCH v6 02/11] hvf: x86: Remove unused definitions Alexander Graf
2021-01-21  7:27   ` Philippe Mathieu-Daudé
2021-02-09 10:07   ` Roman Bolshakov
2021-01-20 22:44 ` [PATCH v6 03/11] hvf: Move common code out Alexander Graf
2021-01-21  7:26   ` Philippe Mathieu-Daudé
2021-05-16 14:12     ` Alexander Graf
2021-01-28 15:23   ` Peter Maydell
2021-01-20 22:44 ` [PATCH v6 04/11] hvf: Introduce hvf vcpu struct Alexander Graf
2021-01-20 22:44 ` [PATCH v6 05/11] arm: Set PSCI to 0.2 for HVF Alexander Graf
2021-01-28 15:25   ` Peter Maydell
2021-01-20 22:44 ` [PATCH v6 06/11] hvf: Simplify post reset/init/loadvm hooks Alexander Graf
2021-01-28 15:28   ` Peter Maydell
2021-02-10 21:34     ` Alexander Graf
2021-01-20 22:44 ` [PATCH v6 07/11] hvf: Add Apple Silicon support Alexander Graf
2021-01-28 15:52   ` Peter Maydell
2021-02-10 22:20     ` Alexander Graf
2021-02-10 22:39       ` Peter Maydell
2021-02-11 13:06         ` Alexander Graf
2021-02-11 13:16           ` Peter Maydell
2021-01-20 22:44 ` [PATCH v6 08/11] arm: Add Hypervisor.framework build target Alexander Graf
2021-01-28 16:00   ` Peter Maydell
2021-01-20 22:44 ` [PATCH v6 09/11] arm/hvf: Add a WFI handler Alexander Graf
2021-01-28 16:25   ` Peter Maydell
2021-02-10 20:25     ` Peter Collingbourne
2021-02-10 22:17       ` Peter Maydell
2021-02-11  0:33         ` Alexander Graf
2021-03-21 16:28         ` Alexander Graf
2021-01-20 22:44 ` [PATCH v6 10/11] hvf: arm: Add support for GICv3 Alexander Graf
2021-01-28 16:40   ` Peter Maydell
2021-03-21 16:36     ` Alexander Graf
2021-01-20 22:44 ` [PATCH v6 11/11] hvf: arm: Implement -cpu host Alexander Graf
2021-01-28 16:55   ` Peter Maydell
2021-05-16 11:16     ` Alexander Graf
2021-05-16 16:12       ` Peter Maydell [this message]
2021-01-20 23:03 ` [PATCH v6 00/11] hvf: Implement Apple Silicon Support no-reply
2021-01-28 16:55 ` Stefan Weil
2021-01-28 16:59 ` Peter Maydell
2021-01-28 17:12   ` Roman Bolshakov

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