linux-kernel - Re: [PATCH] RISC-V: Enable Zicbom in usermode

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Message-ID: <20241219-4332cfcb6bd63baf5d0328d7@orel>
Date: Thu, 19 Dec 2024 15:12:30 +0100
From: Andrew Jones <ajones@...tanamicro.com>
To: Yunhui Cui <cuiyunhui@...edance.com>
Cc: punit.agrawal@...edance.com, paul.walmsley@...ive.com, 
	palmer@...belt.com, aou@...s.berkeley.edu, conor@...nel.org, cleger@...osinc.com, 
	charlie@...osinc.com, evan@...osinc.com, samuel.holland@...ive.com, andybnac@...il.com, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] RISC-V: Enable Zicbom in usermode

On Fri, Oct 25, 2024 at 05:15:27PM +0800, Yunhui Cui wrote:
> Like Zicboz, by enabling the corresponding bits of senvcfg,
> the instructions cbo.clean, cbo.flush, and cbo.inval can be
> executed normally in user mode.
> 
> Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
> ---
>  arch/riscv/kernel/cpufeature.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> index 1992ea64786e..bc850518ab41 100644
> --- a/arch/riscv/kernel/cpufeature.c
> +++ b/arch/riscv/kernel/cpufeature.c
> @@ -924,7 +924,7 @@ unsigned long riscv_get_elf_hwcap(void)
>  void __init riscv_user_isa_enable(void)
>  {
>  	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZICBOZ))
> -		current->thread.envcfg |= ENVCFG_CBZE;
> +		current->thread.envcfg |= ENVCFG_CBIE | ENVCFG_CBCFE | ENVCFG_CBZE;
>  	else if (any_cpu_has_zicboz)
>  		pr_warn("Zicboz disabled as it is unavailable on some harts\n");
>  }
> -- 
> 2.39.2
>

Hi Yunhui,

Do you plan to send a v2 of this?

Thanks,
drew