linux-kernel - Re: [PATCH v4 01/15] arm64: rsi: Add RSI definitions

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Message-ID: <3b1c8387-f40f-4841-b2b3-9e4dc1e35efc@redhat.com>
Date: Tue, 9 Jul 2024 15:19:03 +1000
From: Gavin Shan <gshan@...hat.com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Suzuki K Poulose <suzuki.poulose@....com>,
 Catalin Marinas <catalin.marinas@....com>, Marc Zyngier <maz@...nel.org>,
 Will Deacon <will@...nel.org>, James Morse <james.morse@....com>,
 Oliver Upton <oliver.upton@...ux.dev>, Zenghui Yu <yuzenghui@...wei.com>,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Joey Gouly <joey.gouly@....com>, Alexandru Elisei
 <alexandru.elisei@....com>, Christoffer Dall <christoffer.dall@....com>,
 Fuad Tabba <tabba@...gle.com>, linux-coco@...ts.linux.dev,
 Ganapatrao Kulkarni <gankulkarni@...amperecomputing.com>
Subject: Re: [PATCH v4 01/15] arm64: rsi: Add RSI definitions

On 7/1/24 7:54 PM, Steven Price wrote:
> From: Suzuki K Poulose <suzuki.poulose@....com>
> 
> The RMM (Realm Management Monitor) provides functionality that can be
> accessed by a realm guest through SMC (Realm Services Interface) calls.
> 
> The SMC definitions are based on DEN0137[1] version A-eac5.
> 
> [1] https://developer.arm.com/documentation/den0137/latest
> 
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> Changes since v3:
>   * Drop invoke_rsi_fn_smc_with_res() function and call arm_smccc_smc()
>     directly instead.
>   * Rename header guard in rsi_smc.h to be consistent.
> Changes since v2:
>   * Rename rsi_get_version() to rsi_request_version()
>   * Fix size/alignment of struct realm_config
> ---
>   arch/arm64/include/asm/rsi_cmds.h |  38 ++++++++
>   arch/arm64/include/asm/rsi_smc.h  | 142 ++++++++++++++++++++++++++++++
>   2 files changed, 180 insertions(+)
>   create mode 100644 arch/arm64/include/asm/rsi_cmds.h
>   create mode 100644 arch/arm64/include/asm/rsi_smc.h
> 

[...]

> --- /dev/null
> +++ b/arch/arm64/include/asm/rsi_smc.h
> @@ -0,0 +1,142 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright (C) 2023 ARM Ltd.
> + */
> +
> +#ifndef __ASM_RSI_SMC_H_
> +#define __ASM_RSI_SMC_H_
> +
> +/*
> + * This file describes the Realm Services Interface (RSI) Application Binary
> + * Interface (ABI) for SMC calls made from within the Realm to the RMM and
> + * serviced by the RMM.
> + */
> +
> +#define SMC_RSI_CALL_BASE		0xC4000000
> +

These fields have been defined in include/linux/arm-smccc.h. Those definitions
can be reused. Otherwise, it's not obvious to reader what does 0xC4000000 represent.

#define SMC_RSI_CALL_BASE	((ARM_SMCCC_FAST_CALL << ARM_SMCCC_TYPE_SHIFT)   | \
                                  (ARM_SMCCC_SMC_64 << ARM_SMCCC_CALL_CONV_SHIFT) | \
                                  (ARM_SMCCC_OWNER_STANDARD << ARM_SMCCC_OWNER_SHIFT))

or

#define SMC_RSI_CALL_BASE       ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL,            \
                                                    ARM_SMCCC_SMC_64,               \
                                                    ARM_SMCCC_OWNER_STANDARD,       \
                                                    0)

Thanks,
Gavin