linux-kernel - Re: [PATCH 0/3] KVM: arm64: Support FF-A 1.2 and SEND

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Message-ID: <aBSgAScZUp9qIspT@google.com>
Date: Fri, 2 May 2025 10:35:45 +0000
From: Sebastian Ene <sebastianene@...gle.com>
To: Per Larsen <perl@...unant.com>
Cc: linux-kernel@...r.kernel.org, catalin.marinas@....com,
	james.morse@....com, jean-philippe@...aro.org,
	kernel-team@...roid.com, kvmarm@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, lpieralisi@...nel.org,
	maz@...nel.org, oliver.upton@...ux.dev, qperret@...gle.com,
	qwandor@...gle.com, sudeep.holla@....com, suzuki.poulose@....com,
	tabba@...gle.com, will@...nel.org, yuzenghui@...wei.com,
	armellel@...gle.com, arve@...roid.com, ahomescu@...gle.com
Subject: Re: [PATCH 0/3] KVM: arm64: Support FF-A 1.2 and SEND_DIRECT2 ABI

On Fri, May 02, 2025 at 02:21:05AM -0700, Per Larsen 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. The bulk
> of this change has to do with the upgrade to SMCCC 1.2 required by
> FF-A 1.2. Additionally, unimplemented FF-A 1.2 interfaces are added to
> the list of unsupported functions.
> 
> 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.
> 
> (This is my second attempt at sending out these patches; sorry about
> my broken first try and the resulting duplicate messages.)

Please tag this series with v2 if this is the second one and include a
changelog.

> 
> Thanks,
> Per Larsen
> 
> Per Larsen (3):
>   KVM: arm64: Restrict FF-A host version renegotiation
>   KVM: arm64: Bump the supported version of FF-A to 1.2
>   KVM: arm64: Support FFA_MSG_SEND_DIRECT_REQ2 in host handler
> 
>  arch/arm64/kvm/hyp/nvhe/Makefile |   1 +
>  arch/arm64/kvm/hyp/nvhe/ffa.c    | 235 ++++++++++++++++++++++++++++---
>  include/linux/arm_ffa.h          |   2 +
>  3 files changed, 221 insertions(+), 17 deletions(-)
> 
> --
> 2.49.0
>

Thanks,
Seb