linux-kernel - Re: [PATCH v4 03/10] riscv: hwprobe: Export Zalasr extension

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Message-ID: <CAJF2gTREY07Eo0EgB9ew1sd6FkMtoFSTgyC5ny2SQKKd83xEtw@mail.gmail.com>
Date: Mon, 20 Oct 2025 21:46:51 +0800
From: Guo Ren <guoren@...nel.org>
To: Xu Lu <luxu.kernel@...edance.com>
Cc: corbet@....net, paul.walmsley@...ive.com, palmer@...belt.com, 
	aou@...s.berkeley.edu, alex@...ti.fr, robh@...nel.org, krzk+dt@...nel.org, 
	conor+dt@...nel.org, will@...nel.org, peterz@...radead.org, 
	boqun.feng@...il.com, mark.rutland@....com, anup@...infault.org, 
	atish.patra@...ux.dev, pbonzini@...hat.com, shuah@...nel.org, 
	parri.andrea@...il.com, ajones@...tanamicro.com, brs@...osinc.com, 
	linux-doc@...r.kernel.org, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, kvm@...r.kernel.org, 
	kvm-riscv@...ts.infradead.org, linux-kselftest@...r.kernel.org, 
	apw@...onical.com, joe@...ches.com, lukas.bulwahn@...il.com
Subject: Re: [PATCH v4 03/10] riscv: hwprobe: Export Zalasr extension

On Mon, Oct 20, 2025 at 12:21 PM Xu Lu <luxu.kernel@...edance.com> wrote:
>
> Export the Zalasr extension to userspace using hwprobe.
>
> Signed-off-by: Xu Lu <luxu.kernel@...edance.com>
> ---
>  Documentation/arch/riscv/hwprobe.rst  | 5 ++++-
>  arch/riscv/include/uapi/asm/hwprobe.h | 1 +
>  arch/riscv/kernel/sys_hwprobe.c       | 1 +
>  3 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst
> index 2aa9be272d5de..067a3595fb9d5 100644
> --- a/Documentation/arch/riscv/hwprobe.rst
> +++ b/Documentation/arch/riscv/hwprobe.rst
> @@ -249,6 +249,9 @@ The following keys are defined:
>         defined in the in the RISC-V ISA manual starting from commit e87412e621f1
>         ("integrate Zaamo and Zalrsc text (#1304)").
>
> +  * :c:macro:`RISCV_HWPROBE_EXT_ZALASR`: The Zalasr extension is supported as
> +       frozen at commit 194f0094 ("Version 0.9 for freeze") of riscv-zalasr.
"Frozen Version 0.9" might not be proper; it denotes the current
temporary state, not the goal of the patch.

> +
>    * :c:macro:`RISCV_HWPROBE_EXT_ZALRSC`: The Zalrsc extension is supported as
>         defined in the in the RISC-V ISA manual starting from commit e87412e621f1
>         ("integrate Zaamo and Zalrsc text (#1304)").
> @@ -360,4 +363,4 @@ The following keys are defined:
>
>      * :c:macro:`RISCV_HWPROBE_VENDOR_EXT_XSFVFWMACCQQQ`: The Xsfvfwmaccqqq
>          vendor extension is supported in version 1.0 of Matrix Multiply Accumulate
> -       Instruction Extensions Specification.
> \ No newline at end of file
> +       Instruction Extensions Specification.
> diff --git a/arch/riscv/include/uapi/asm/hwprobe.h b/arch/riscv/include/uapi/asm/hwprobe.h
> index aaf6ad9704993..d3a65f8ff7da4 100644
> --- a/arch/riscv/include/uapi/asm/hwprobe.h
> +++ b/arch/riscv/include/uapi/asm/hwprobe.h
> @@ -82,6 +82,7 @@ struct riscv_hwprobe {
>  #define                RISCV_HWPROBE_EXT_ZAAMO         (1ULL << 56)
>  #define                RISCV_HWPROBE_EXT_ZALRSC        (1ULL << 57)
>  #define                RISCV_HWPROBE_EXT_ZABHA         (1ULL << 58)
> +#define                RISCV_HWPROBE_EXT_ZALASR        (1ULL << 59)
>  #define RISCV_HWPROBE_KEY_CPUPERF_0    5
>  #define                RISCV_HWPROBE_MISALIGNED_UNKNOWN        (0 << 0)
>  #define                RISCV_HWPROBE_MISALIGNED_EMULATED       (1 << 0)
> diff --git a/arch/riscv/kernel/sys_hwprobe.c b/arch/riscv/kernel/sys_hwprobe.c
> index 0b170e18a2beb..0529e692b1173 100644
> --- a/arch/riscv/kernel/sys_hwprobe.c
> +++ b/arch/riscv/kernel/sys_hwprobe.c
> @@ -99,6 +99,7 @@ static void hwprobe_isa_ext0(struct riscv_hwprobe *pair,
>                 EXT_KEY(ZAAMO);
>                 EXT_KEY(ZABHA);
>                 EXT_KEY(ZACAS);
> +               EXT_KEY(ZALASR);
>                 EXT_KEY(ZALRSC);
>                 EXT_KEY(ZAWRS);
>                 EXT_KEY(ZBA);
> --
> 2.20.1
>


-- 
Best Regards
 Guo Ren