linux-kernel - Re: [PATCH v2 2/4] riscv: hwprobe: Report Zicbop presence and block size

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251009-643d7302be8ec611ea622aff@orel>
Date: Thu, 9 Oct 2025 12:08:52 -0500
From: Andrew Jones <ajones@...tanamicro.com>
To: Yao Zihong <zihong.plct@...c.iscas.ac.cn>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	alexghiti@...osinc.com, shuah@...nel.org, samuel.holland@...ive.com, evan@...osinc.com, 
	cleger@...osinc.com, zihongyao@...look.com, zhangyin2018@...as.ac.cn, 
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
	Charlie Jenkins <charlie@...osinc.com>, Jesse Taube <jesse@...osinc.com>, 
	Inochi Amaoto <inochiama@...il.com>, Aleksa Paunovic <aleksa.paunovic@...cgroup.com>, 
	Thomas Weißschuh <thomas.weissschuh@...utronix.de>, Yunhui Cui <cuiyunhui@...edance.com>, 
	Nam Cao <namcao@...utronix.de>
Subject: Re: [PATCH v2 2/4] riscv: hwprobe: Report Zicbop presence and block
 size

On Thu, Oct 09, 2025 at 09:41:52PM +0800, Yao Zihong wrote:
> Plumb Zicbop into hwprobe. Semantics mirror Zicbom/Zicboz to keep
> userspace expectations aligned.
> 
> Signed-off-by: Yao Zihong <zihong.plct@...c.iscas.ac.cn>
> ---
>  arch/riscv/kernel/sys_hwprobe.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c
> index 000f4451a9d8..7a6ae1327504 100644
> --- a/arch/riscv/kernel/sys_hwprobe.c
> +++ b/arch/riscv/kernel/sys_hwprobe.c
> @@ -113,6 +113,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
>  		EXT_KEY(ZCB);
>  		EXT_KEY(ZCMOP);
>  		EXT_KEY(ZICBOM);
> +		EXT_KEY(ZICBOP);
>  		EXT_KEY(ZICBOZ);
>  		EXT_KEY(ZICNTR);
>  		EXT_KEY(ZICOND);
> @@ -293,6 +294,11 @@ static void hwprobe_one_pair(struct riscv_hwprobe *pair,
>  		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOM))
>  			pair->value = riscv_cbom_block_size;
>  		break;
> +	case RISCV_HWPROBE_KEY_ZICBOP_BLOCK_SIZE:
> +		pair->value = 0;
> +		if (hwprobe_ext0_has(cpus, RISCV_HWPROBE_EXT_ZICBOP))
> +			pair->value = riscv_cbop_block_size;
> +		break;
>  	case RISCV_HWPROBE_KEY_HIGHEST_VIRT_ADDRESS:
>  		pair->value = user_max_virt_addr();
>  		break;
> -- 
> 2.47.2
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>