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

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Message-ID: <20250502092108.3224341-1-perl@immunant.com>
Date: Fri,  2 May 2025 02:21:05 -0700
From: Per Larsen <perl@...unant.com>
To: linux-kernel@...r.kernel.org
Cc: sebastianene@...gle.com,
	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,
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	will@...nel.org,
	yuzenghui@...wei.com,
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	ahomescu@...gle.com,
	Per Larsen <perl@...unant.com>
Subject: [PATCH 0/3] KVM: arm64: Support FF-A 1.2 and SEND_DIRECT2 ABI

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.)

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