linux-kernel - Re: [PATCH v8 6/7] KVM: arm64: Bump the supported version of FF-A to 1.2

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Message-ID: <aIjtfPY2db0LOwe4@willie-the-truck>
Date: Tue, 29 Jul 2025 16:49:16 +0100
From: Will Deacon <will@...nel.org>
To: perlarsen@...gle.com
Cc: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>,
	Joey Gouly <joey.gouly@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Zenghui Yu <yuzenghui@...wei.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Sudeep Holla <sudeep.holla@....com>,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, ahomescu@...gle.com,
	armellel@...gle.com, arve@...roid.com, ayrton@...gle.com,
	qperret@...gle.com, sebastianene@...gle.com, qwandor@...gle.com
Subject: Re: [PATCH v8 6/7] KVM: arm64: Bump the supported version of FF-A to
 1.2

On Sat, Jul 19, 2025 at 02:11:28AM +0000, Per Larsen via B4 Relay wrote:
> From: Per Larsen <perlarsen@...gle.com>
> 
> FF-A version 1.2 introduces the DIRECT_REQ2 ABI. Bump the FF-A version
> preferred by the hypervisor as a precursor to implementing the 1.2-only
> FFA_MSG_SEND_DIRECT_REQ2 and FFA_MSG_SEND_RESP2 messaging interfaces.
> 
> Co-developed-by: Ayrton Munoz <ayrton@...gle.com>
> Signed-off-by: Ayrton Munoz <ayrton@...gle.com>
> Signed-off-by: Per Larsen <perlarsen@...gle.com>
> ---
>  arch/arm64/kvm/hyp/nvhe/ffa.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c
> index 2cbecc9af5d27a9e7c8497001cf9b0987c72bdb4..f6d964df53c3e21ba85984f35cc7b6859012d1b0 100644
> --- a/arch/arm64/kvm/hyp/nvhe/ffa.c
> +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c
> @@ -930,7 +930,7 @@ int hyp_ffa_init(void *pages)
>  
>  	arm_smccc_1_2_smc(&(struct arm_smccc_1_2_regs) {
>  		.a0 = FFA_VERSION,
> -		.a1 = FFA_VERSION_1_1,
> +		.a1 = FFA_VERSION_1_2,
>  	}, &res);
>  	if (res.a0 == FFA_RET_NOT_SUPPORTED)
>  		return 0;
> @@ -951,10 +951,10 @@ int hyp_ffa_init(void *pages)
>  	if (FFA_MAJOR_VERSION(res.a0) != 1)
>  		return -EOPNOTSUPP;
>  
> -	if (FFA_MINOR_VERSION(res.a0) < FFA_MINOR_VERSION(FFA_VERSION_1_1))
> +	if (FFA_MINOR_VERSION(res.a0) < FFA_MINOR_VERSION(FFA_VERSION_1_2))
>  		hyp_ffa_version = res.a0;
>  	else
> -		hyp_ffa_version = FFA_VERSION_1_1;
> +		hyp_ffa_version = FFA_VERSION_1_2;

Acked-by: Will Deacon <will@...nel.org>

Will