linux-kernel - Re: [PATCH v8 04/43] arm64: RME: Add wrappers for RMI calls

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Message-ID: <d43d1813-5402-488c-aadc-6336dedeccbe@arm.com>
Date: Fri, 25 Apr 2025 11:48:20 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: 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>,
 Gavin Shan <gshan@...hat.com>, Shanker Donthineni <sdonthineni@...dia.com>,
 Alper Gun <alpergun@...gle.com>, "Aneesh Kumar K . V"
 <aneesh.kumar@...nel.org>
Subject: Re: [PATCH v8 04/43] arm64: RME: Add wrappers for RMI calls

Hi Steven

On 16/04/2025 14:41, Steven Price wrote:
> The wrappers make the call sites easier to read and deal with the
> boiler plate of handling the error codes from the RMM.
> 
> Reviewed-by: Gavin Shan <gshan@...hat.com>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> Changes from v7:
>   * Minor renaming of parameters and updated comments
> Changes from v5:
>   * Further improve comments
> Changes from v4:
>   * Improve comments
> Changes from v2:
>   * Make output arguments optional.
>   * Mask RIPAS value rmi_rtt_read_entry()
>   * Drop unused rmi_rtt_get_phys()
> ---
>   arch/arm64/include/asm/rmi_cmds.h | 508 ++++++++++++++++++++++++++++++
>   1 file changed, 508 insertions(+)
>   create mode 100644 arch/arm64/include/asm/rmi_cmds.h
> 
> diff --git a/arch/arm64/include/asm/rmi_cmds.h b/arch/arm64/include/asm/rmi_cmds.h
> new file mode 100644
> index 000000000000..27cd2751f3bf
> --- /dev/null
> +++ b/arch/arm64/include/asm/rmi_cmds.h
> @@ -0,0 +1,508 @@

...

> +
> +/**
> + * rmi_rtt_destroy() - Destroy an RTT
> + * @rd: PA of the RD
> + * @ipa: Base of the IPA range described by the RTT
> + * @level: Depth of the RTT within the tree
> + * @out_rtt: Pointer to write the PA of the RTT which was destroyed
> + * @out_top: Pointer to write the top IPA of non-live RTT entries
> + *
> + * Destroys an RTT. The RTT must be non-live, i.e. none of the entries in the
> + * table are in ASSIGNED or TABLE state.

minor nit: It may be worth emphasising that you mean HIPAS here and not
RMI_ASSIGNED (as returned by RTT_READ_ENTRY). The key is, an unprotected
live leaf mapping  (i.e., HIPAS=ASSIGNED_NS) is considered non-live.

Either ways:

Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>