linux-kernel - Re: [PATCH v11 0/6] KVM: arm64: Support FF-A 1.2

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Message-ID: <aL7qtRZtT687R2IC@willie-the-truck>
Date: Mon, 8 Sep 2025 15:39:49 +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 v11 0/6] KVM: arm64: Support FF-A 1.2

On Wed, Aug 20, 2025 at 01:10:04AM +0000, Per Larsen via B4 Relay wrote:
> Hi,
> 
> The FF-A 1.2 specification introduces a new SEND_DIRECT2 ABI which
> allows registers x4-x17 to be used for the message payload. This patch
> set prevents the host from using a lower FF-A version than what has
> already been negotiated with the hypervisor. This is necessary because
> the hypervisor does not have the necessary compatibility paths to
> translate from the hypervisor FF-A version to a previous version.
> 
> Support for FF-A 1.2 in the hypervisor is added as a precursor to the
> addition of the FFA_MSG_SEND_DIRECT_REQ2 messaging interface. Notably,
> this patch updates all smc calls to use SMCCC 1.2 as it makes it simpler
> to support interfaces that need to accept more than 8 arguments and/or
> return more than 4 values. The list of optional/unsupported interfaces
> was updated to reflect additions in FF-A 1.2.
> 
> Tested by booting Android under QEMU and loading Trusty as the guest
> VM and observing the SEND_DIRECT2 ABI being used successfully during
> guest boot.
> 
> Changes in v11:
> - 2/6:         ffa_set_retval: Add more details about anticipated FF-A 1.3 update. Fix typo.
> - Link to v10: https://lore.kernel.org/r/20250809-virtio-msg-ffa-v10-0-189eeecf8ae8@google.com

Thanks, this all looks good to me now.

Assuming Marc's happy, this should go via the kvmarm tree.

Will