linux-kernel - Re: [PATCH v5 03/19] arm64: rsi: Add RSI definitions

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Message-ID: <ZsxSix3Om-Khmfup@arm.com>
Date: Mon, 26 Aug 2024 13:01:47 +0300
From: Catalin Marinas <catalin.marinas@....com>
To: Steven Price <steven.price@....com>
Cc: kvm@...r.kernel.org, kvmarm@...ts.linux.dev,
	Marc Zyngier <maz@...nel.org>, Will Deacon <will@...nel.org>,
	James Morse <james.morse@....com>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	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>,
	Gavin Shan <gshan@...hat.com>,
	Shanker Donthineni <sdonthineni@...dia.com>,
	Alper Gun <alpergun@...gle.com>
Subject: Re: [PATCH v5 03/19] arm64: rsi: Add RSI definitions

On Mon, Aug 19, 2024 at 02:19:08PM +0100, 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 1.0-rel0-rc1.
> 
> [1] https://developer.arm.com/-/cdn-downloads/permalink/PDF/Architectures/DEN0137_1.0-rel0-rc1_rmm-arch_external.pdf
> 
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> Signed-off-by: Steven Price <steven.price@....com>

Acked-by: Catalin Marinas <catalin.marinas@....com>

(I did cross-check the definitions with the spec)

> +struct realm_config {
> +	union {
> +		struct {
> +			unsigned long ipa_bits; /* Width of IPA in bits */
> +			unsigned long hash_algo; /* Hash algorithm */
> +		};
> +		u8 pad[0x200];
> +	};
> +	union {
> +		u8 rpv[64]; /* Realm Personalization Value */
> +		u8 pad2[0xe00];
> +	};
> +	/*
> +	 * The RMM requires the configuration structure to be aligned to a 4k
> +	 * boundary, ensure this happens by aligning this structure.
> +	 */
> +} __aligned(0x1000);

It might have been easier to just write the pad sizes in decimal (trying
to figure out what 0xe00 is ;)). Anyway, it's fine like this as well.

-- 
Catalin