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

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Message-ID: <CAE2XoE9Xc0CeNiRZnwANU2Q9Mbg6f0hCOyrkNA+h5Jp-2mrsBA@mail.gmail.com>
Date: Mon, 17 Feb 2025 14:40:51 +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

> Well, there is no magic. If you don't write to VPIDR_EL2, not much
> will happen. You need to apply Oliver's change instead of the first
> patch in this series.

Thanks, after applying Oliver's change, it's working, my concern post
at the beginning is to ask if
 Oliver's can resolve the issue:)
Now after testing Oliver's change, it's working, thanks
Sebastian,Oliver and Marc Zyngier:)

My test result now is:
```
/home/lygstate/work/qemu/build:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
/home/lygstate/work/qemu/build/qemu-system-aarch64
+ qemu-system-aarch64 -cpu host,aarch64=off -accel kvm -m 1024M -smp 1
-M virt,gic-version=3,midr=0x412fd050 -nographic -monitor none -serial
stdio -kernel /home/lygstate/work/debian/arm64-kvm-hello-world/bare-metal-aarch32-qemu/hello_world.elf
Get MIDR EL1 origin:0x410fd083
Set MIDR EL1:0x412fd050
Get MIDR EL1:0x412fd050
Hello World midr:0x412fd050
```


>
>         M.
>
> --
> Without deviation from the norm, progress is not possible.



-- 
         此致
礼
罗勇刚
Yours
    sincerely,
Yonggang Luo