linux-kernel - Re: [PATCH v2 1/4] KVM: arm64: Allow userspace to change MIDR

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Message-ID: <CAE2XoE8i=jPgSea5jXY0eOxas9Y_2pa7QheqS1xuw2qeTQDNyw@mail.gmail.com>
Date: Mon, 17 Feb 2025 02:55:23 +0800
From: 罗勇刚(Yonggang Luo) <luoyonggang@...il.com>
To: Marc Zyngier <maz@...nel.org>
Cc: Oliver Upton <oliver.upton@...ux.dev>, Sebastian Ott <sebott@...hat.com>, 
	Joey Gouly <joey.gouly@....com>, Suzuki K Poulose <suzuki.poulose@....com>, 
	Zenghui Yu <yuzenghui@...wei.com>, Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>, 
	Cornelia Huck <cohuck@...hat.com>, Eric Auger <eric.auger@...hat.com>, 
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] KVM: arm64: Allow userspace to change MIDR_EL1

On Mon, Feb 17, 2025 at 2:09 AM Marc Zyngier <maz@...nel.org> wrote:
>
> On Sat, 15 Feb 2025 19:04:20 +0000,
> "罗勇刚(Yonggang Luo)" <luoyonggang@...il.com> wrote:
> >
> > According to this, the MIDR EL1 is updated properly, but the MIDR for
> > aarch32 is not updated, and I don't know how to hook the update for
> > MIDR for aarch32
>
> It is the same thing. The AArch32 view is configured the same way as
> the AArch64 view, and there is nothing to do at all (that's what
> VPIDR_EL2 is all about).
>
> With Oliver's change, I'm correctly getting a different MIDR using a
> hacked up kvmtool, see below. I suspect you're not running with the
> correct patch applied.
>
The applied patch is V2, with writing vpidr_el2 disabled, Is that the cause?
The branch is here
https://github.com/lygstate/linux/tree/main
I am not applying your patch

-- 
         此致
礼
罗勇刚
Yours
    sincerely,
Yonggang Luo