linux-kernel - Re: [PATCH v2 0/3] KVM: arm64: make EL2 feature fields writable in ID_AA64MMFR1

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Message-ID: <6a1ec9d7-f41b-4ea2-a42c-26eec9591195@huawei.com>
Date: Wed, 10 Sep 2025 09:42:32 +0800
From: Jinqian Yang <yangjinqian1@...wei.com>
To: Oliver Upton <oliver.upton@...ux.dev>
CC: <yuzenghui@...wei.com>, <maz@...nel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <kvmarm@...ts.linux.dev>,
	<linux-kernel@...r.kernel.org>, <liuyonglong@...wei.com>,
	<wangzhou1@...ilicon.com>
Subject: Re: [PATCH v2 0/3] KVM: arm64: make EL2 feature fields writable in
 ID_AA64MMFR1_EL1



On 2025/9/9 15:00, Oliver Upton wrote:
> On Tue, Sep 09, 2025 at 11:44:12AM +0800, Jinqian Yang wrote:
>> Allow userspace to downgrade EL2 features (VH, TWED, HCX) to ensure VM live
>> migration compatibility between hosts with varying feature support.
>>
>> v1: https://lore.kernel.org/linux-arm-kernel/20250325121126.1380681-1-yangjinqian1@huawei.com/
>>
>> Change Log:
>> v1->v2:
>>    -Added support for downgrading TWED and VH fields.
>>    -Added corresponding test cases to the set_id_regs selftest.
>>
>> Jinqian Yang (3):
>>    KVM: arm64: Make ID_AA64MMFR1_EL1.HCX writable from userspace
>>    KVM: arm64: Make ID_AA64MMFR1_EL1.TWED writable from userspace
>>    KVM: arm64: Make ID_AA64MMFR1_EL1.VH writable from userspace
>>
>>   arch/arm64/kvm/sys_regs.c                       | 3 ---
>>   tools/testing/selftests/kvm/arm64/set_id_regs.c | 3 +++
> 
> General comment: please make do kernel and selftest changes in separate
> patches.
> 

Will be changed in v3.

Thanks,
Jinqian