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

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Message-ID: <20250818-8beeedd83482f6e618be2ea0@orel>
Date: Mon, 18 Aug 2025 15:33:59 -0500
From: Andrew Jones <ajones@...tanamicro.com>
To: zhouquan@...as.ac.cn
Cc: anup@...infault.org, atishp@...shpatra.org, paul.walmsley@...ive.com, 
	palmer@...belt.com, 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 Fri, Aug 08, 2025 at 06:18:34PM +0800, 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: Andrew Jones <ajones@...tanamicro.com>