linux-kernel - Re: [PATCH v2 3/3] RISC-V: Implement archrandom when Zkr is available

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Message-ID: <20230706-putdown-unedited-012eafe854f6@wendy>
Date:   Thu, 6 Jul 2023 14:33:02 +0100
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Samuel Ortiz <sameo@...osinc.com>
CC:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        <linux-riscv@...ts.infradead.org>, <linux@...osinc.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Heiko Stuebner <heiko.stuebner@...ll.eu>,
        Anup Patel <apatel@...tanamicro.com>,
        <linux-kernel@...r.kernel.org>,
        "Hongren (Zenithal) Zheng" <i@...ithal.me>,
        Guo Ren <guoren@...nel.org>, Atish Patra <atishp@...osinc.com>,
        Björn Töpel <bjorn@...osinc.com>,
        Evan Green <evan@...osinc.com>
Subject: Re: [PATCH v2 3/3] RISC-V: Implement archrandom when Zkr is available

On Wed, Jun 28, 2023 at 03:14:35PM +0200, Samuel Ortiz wrote:
> The Zkr extension is ratified and provides 16 bits of entropy seed when
> reading the SEED CSR.
> 
> We can implement arch_get_random_seed_longs() by doing multiple csrrw to
> that CSR and filling an unsigned long with valid entropy bits.
> 
> Signed-off-by: Samuel Ortiz <sameo@...osinc.com>

Acked-by: Conor Dooley <conor.dooley@...rochip.com>

Cheers,
Conor.

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