linux-kernel - Re: [PATCH v6 01/14] riscv: sbi: add Firmware Feature (FWFT) SBI extensions definitions

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Message-ID: <adbf1bdb-b4a6-4004-91a2-8ae1a7c6485d@linux.dev>
Date: Thu, 8 May 2025 13:17:20 -0700
From: Atish Patra <atish.patra@...ux.dev>
To: Clément Léger <cleger@...osinc.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Anup Patel <anup@...infault.org>,
 Atish Patra <atishp@...shpatra.org>, Shuah Khan <shuah@...nel.org>,
 Jonathan Corbet <corbet@....net>, linux-riscv@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
 kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
 linux-kselftest@...r.kernel.org
Cc: Samuel Holland <samuel.holland@...ive.com>,
 Andrew Jones <ajones@...tanamicro.com>, Deepak Gupta <debug@...osinc.com>
Subject: Re: [PATCH v6 01/14] riscv: sbi: add Firmware Feature (FWFT) SBI
 extensions definitions

On 4/24/25 10:31 AM, ClÃ©ment LÃ©ger wrote:
> The Firmware Features extension (FWFT) was added as part of the SBI 3.0
> specification. Add SBI definitions to use this extension.
> 
> Signed-off-by: Clément Léger <cleger@...osinc.com>
> Reviewed-by: Samuel Holland <samuel.holland@...ive.com>
> Tested-by: Samuel Holland <samuel.holland@...ive.com>
> Reviewed-by: Deepak Gupta <debug@...osinc.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>   arch/riscv/include/asm/sbi.h | 33 +++++++++++++++++++++++++++++++++
>   1 file changed, 33 insertions(+)
> 
> diff --git a/arch/riscv/include/asm/sbi.h b/arch/riscv/include/asm/sbi.h
> index 3d250824178b..bb077d0c912f 100644
> --- a/arch/riscv/include/asm/sbi.h
> +++ b/arch/riscv/include/asm/sbi.h
> @@ -35,6 +35,7 @@ enum sbi_ext_id {
>   	SBI_EXT_DBCN = 0x4442434E,
>   	SBI_EXT_STA = 0x535441,
>   	SBI_EXT_NACL = 0x4E41434C,
> +	SBI_EXT_FWFT = 0x46574654,
>   
>   	/* Experimentals extensions must lie within this range */
>   	SBI_EXT_EXPERIMENTAL_START = 0x08000000,
> @@ -402,6 +403,33 @@ enum sbi_ext_nacl_feature {
>   #define SBI_NACL_SHMEM_SRET_X(__i)		((__riscv_xlen / 8) * (__i))
>   #define SBI_NACL_SHMEM_SRET_X_LAST		31
>   
> +/* SBI function IDs for FW feature extension */
> +#define SBI_EXT_FWFT_SET		0x0
> +#define SBI_EXT_FWFT_GET		0x1
> +
> +enum sbi_fwft_feature_t {
> +	SBI_FWFT_MISALIGNED_EXC_DELEG		= 0x0,
> +	SBI_FWFT_LANDING_PAD			= 0x1,
> +	SBI_FWFT_SHADOW_STACK			= 0x2,
> +	SBI_FWFT_DOUBLE_TRAP			= 0x3,
> +	SBI_FWFT_PTE_AD_HW_UPDATING		= 0x4,
> +	SBI_FWFT_POINTER_MASKING_PMLEN		= 0x5,
> +	SBI_FWFT_LOCAL_RESERVED_START		= 0x6,
> +	SBI_FWFT_LOCAL_RESERVED_END		= 0x3fffffff,
> +	SBI_FWFT_LOCAL_PLATFORM_START		= 0x40000000,
> +	SBI_FWFT_LOCAL_PLATFORM_END		= 0x7fffffff,
> +
> +	SBI_FWFT_GLOBAL_RESERVED_START		= 0x80000000,
> +	SBI_FWFT_GLOBAL_RESERVED_END		= 0xbfffffff,
> +	SBI_FWFT_GLOBAL_PLATFORM_START		= 0xc0000000,
> +	SBI_FWFT_GLOBAL_PLATFORM_END		= 0xffffffff,
> +};
> +
> +#define SBI_FWFT_PLATFORM_FEATURE_BIT		BIT(30)
> +#define SBI_FWFT_GLOBAL_FEATURE_BIT		BIT(31)
> +
> +#define SBI_FWFT_SET_FLAG_LOCK			BIT(0)
> +
>   /* SBI spec version fields */
>   #define SBI_SPEC_VERSION_DEFAULT	0x1
>   #define SBI_SPEC_VERSION_MAJOR_SHIFT	24
> @@ -419,6 +447,11 @@ enum sbi_ext_nacl_feature {
>   #define SBI_ERR_ALREADY_STARTED -7
>   #define SBI_ERR_ALREADY_STOPPED -8
>   #define SBI_ERR_NO_SHMEM	-9
> +#define SBI_ERR_INVALID_STATE	-10
> +#define SBI_ERR_BAD_RANGE	-11
> +#define SBI_ERR_TIMEOUT		-12
> +#define SBI_ERR_IO		-13
> +#define SBI_ERR_DENIED_LOCKED	-14
>   
>   extern unsigned long sbi_spec_version;
>   struct sbiret {

Reviewed-by: Atish Patra <atishp@...osinc.com>