linux-kernel - Re: [PATCH v8 27/43] arm64: RME: support RSI_HOST

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Message-ID: <afe9167c-8867-4e5f-8c0b-eb8d6b2813e1@redhat.com>
Date: Thu, 1 May 2025 12:57:24 +1000
From: Gavin Shan <gshan@...hat.com>
To: Steven Price <steven.price@....com>, kvm@...r.kernel.org,
 kvmarm@...ts.linux.dev
Cc: Joey Gouly <joey.gouly@....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>,
 Suzuki K Poulose <suzuki.poulose@....com>, Zenghui Yu
 <yuzenghui@...wei.com>, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, 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>,
 Shanker Donthineni <sdonthineni@...dia.com>, Alper Gun
 <alpergun@...gle.com>, "Aneesh Kumar K . V" <aneesh.kumar@...nel.org>
Subject: Re: [PATCH v8 27/43] arm64: RME: support RSI_HOST_CALL

On 4/16/25 11:41 PM, Steven Price wrote:
> From: Joey Gouly <joey.gouly@....com>
> 
> Forward RSI_HOST_CALLS to KVM's HVC handler.
> 
> Signed-off-by: Joey Gouly <joey.gouly@....com>
> Signed-off-by: Steven Price <steven.price@....com>
> ---
> Changes since v7:
>   * Avoid turning a negative return from kvm_smccc_call_handler() into a
>     error response to the guest. Instead propogate the error back to user
>     space.
> Changes since v4:
>   * Setting GPRS is now done by kvm_rec_enter() rather than
>     rec_exit_host_call() (see previous patch - arm64: RME: Handle realm
>     enter/exit). This fixes a bug where the registers set by user space
>     were being ignored.
> ---
>   arch/arm64/kvm/rme-exit.c | 15 +++++++++++++++
>   1 file changed, 15 insertions(+)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>