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Mon, 21 Sep 2026 09:47:57 -0700 (PDT) Date: Mon, 21 Sep 2026 16:47:46 +0000 Mime-Version: 1.0 X-Mailer: git-send-email 2.55.0.1082.g2b9226bbc0-goog Message-ID: <20260921164748.2958578-1-snehalreddy@google.com> Subject: [PATCH 0/2] KVM: arm64: Support FFA_FN64_MEM_RECLAIM2 in host handler From: Snehal Koukuntla To: Marc Zyngier , Oliver Upton , Catalin Marinas , Will Deacon , Sudeep Holla Cc: Vincent Donnefort , Fuad Tabba , Joey Gouly , Suzuki K Poulose , Mark Rutland , Sebastian Ene , Mostafa Saleh , Snehal Koukuntla , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260921_174759_807636_B3AEAA84 X-CRM114-Status: UNSURE ( 9.66 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The Arm Firmware Framework for Arm A-profile (FF-A) v1.3 ALP5 specification (DEN0140 rev J) [1] introduces the optional FFA_MEM_RECLAIM2 (0xC4000091) ABI. Reclaiming large memory regions with the existing FFA_MEM_RECLAIM ABI can take significant time, or relies on a stateful time-slicing mechanism in the Relayer. FFA_MEM_RECLAIM2 allows an Owner to reclaim exclusive access to a subset of pages from a shared or lent memory region by passing an array of constituent memory region descriptors in its TX buffer along with a starting descriptor byte offset and initial page index. The Relayer returns the number of 4K pages reclaimed in that invocation without maintaining intermediate transaction state. This series adds the FFA_FN64_MEM_RECLAIM2 function ID definition and implements host proxy support in the pKVM nVHE FF-A handler, unsharing the reclaimed pages in the host stage-2 page tables upon a successful reclaim response from EL3/SPMD. This series is based on kvmarm/next, as Patch 2 uses ffa_check_unused_args_sbz() introduced in commit 3e9df0b0ebd5 ("KVM: arm64: Enforce strict SBZ checks in the FF-A proxy"). [1] https://support.arm.com/documentation/den0140/j Snehal Koukuntla (2): firmware: arm_ffa: Add FFA_FN64_MEM_RECLAIM2 function ID KVM: arm64: Support FFA_FN64_MEM_RECLAIM2 in host handler arch/arm64/kvm/hyp/nvhe/ffa.c | 117 ++++++++++++++++++++++++++++++++++ include/linux/arm_ffa.h | 1 + 2 files changed, 118 insertions(+) base-commit: 23ddf997ab16b5f4aa9f948f5a68f5b35e4e398f -- 2.55.0.1082.g2b9226bbc0-goog