linux-kernel - Re: [PATCH v2 2/6] RISC-V: KVM: Provide UAPI for Zicbop block size

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Message-ID:
 <TY1PPFCDFFFA68A08BF1A42657C178794B9F330A@TY1PPFCDFFFA68A.apcprd02.prod.outlook.com>
Date: Tue, 19 Aug 2025 11:39:12 +0800
From: "Nutty.Liu" <nutty.liu@...mail.com>
To: zhouquan@...as.ac.cn, anup@...infault.org, ajones@...tanamicro.com,
 atishp@...shpatra.org, paul.walmsley@...ive.com, palmer@...belt.com
Cc: linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
 kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org
Subject: Re: [PATCH v2 2/6] RISC-V: KVM: Provide UAPI for Zicbop block size


On 8/8/2025 6:18 PM, zhouquan@...as.ac.cn wrote:
> From: Quan Zhou <zhouquan@...as.ac.cn>
>
> We're about to allow guests to use the Zicbop extension.
> KVM userspace needs to know the cache block size in order to
> properly advertise it to the guest. Provide a virtual config
> register for userspace to get it with the GET_ONE_REG API, but
> setting it cannot be supported, so disallow SET_ONE_REG.
>
> Signed-off-by: Quan Zhou <zhouquan@...as.ac.cn>
> ---
>   arch/riscv/include/uapi/asm/kvm.h |  1 +
>   arch/riscv/kvm/vcpu_onereg.c      | 14 ++++++++++++++
>   2 files changed, 15 insertions(+)
Reviewed-by: Nutty Liu <nutty.liu@...mail.com>

Thanks,
Nutty