From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ej1-f71.google.com (mail-ej1-f71.google.com [209.85.218.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6BA0F4E01FB for ; Mon, 21 Sep 2026 16:47:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.218.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790009281; cv=none; b=ot1j2mkUTNnubv2lQTjKpUroeZyWhtzUZxkDkOvx29QxohA7S9UYcU0PndPj9tvuisXxzsQ/ieHazjIA9VkSCf7wve2DCKVZ6oVnNCGQ2BMOHtehSG+VrCkFiC1QWozirnI/gXWHC9BmC9LIyqXjdCwiGq2ONAeI3boMigDsePc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790009281; c=relaxed/simple; bh=/pOEvHUq5bjsocoido3qq4LRiw3/HY/pteCfDkJrc4o=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=d6KU/oQmb/zcil+VwAAkoWlfxovCWazzmARFAOsiLLsVpjr4YWhWVCsbP8sdnmhRduvvDpceAMo2t1WYeY0aKF2WkKqjwoWKRplWqrLihc+iYp14RnemG0qq/RUafGZVSJS6Ugw7V5o1GWZ9Fb67C9w41aTV+yezUT+5TllvPBI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--snehalreddy.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=HON9uAoB; arc=none smtp.client-ip=209.85.218.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--snehalreddy.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="HON9uAoB" Received: by mail-ej1-f71.google.com with SMTP id a640c23a62f3a-c252b87e9a2so270424566b.3 for ; Mon, 21 Sep 2026 09:47:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20251104; t=1790009278; x=1790614078; darn=vger.kernel.org; h=content-type:cc:to:from:subject:message-id:mime-version:date:from :to:cc:subject:date:message-id:reply-to:content-type; bh=wFHA1uhtwa0uaPPbQchvbVnkxkm1bjsmx5CIxWxkScA=; b=HON9uAoBJWgaLG5fuBh5hwfcTQxSmBdbW8U6k4uSf8xjXO3swti2YeX1ijtEjJG5Rf g/+KrYJXOgjBXnqeg1aREMl8kh1f126wpLgX0xL7QZvhjzjND6mTDkg7sO1ffIQ6JoDf FyknA3Wyfilv+yeSf6FgSEWKaNBe2ZqZ035y/OYhxDmVRV4Urf566AIv56XtpGiOSbNA DXyz8U512YguAyAey6tsM1mJKTnwdulLL3Dj4c6YsgB6ZjRYgIw3nTuWWsokShkWG+b6 jEg8Z1fi8q+i6CX7I2cJJmN2z2UnBcUpsfS6CZSjaig9c+ff4UMU4B4I1AAc7zK0EwHV vhzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790009278; x=1790614078; h=content-type:cc:to:from:subject:message-id:mime-version:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=wFHA1uhtwa0uaPPbQchvbVnkxkm1bjsmx5CIxWxkScA=; b=f4Uzeng6+9TJlqt9VmRvW8vDI3g1Yl2Gx12mU8bpW/j5TTc5DzAI8uvKUyKpOYXVZD In/A0lHqSggE7NVB2AUD7qiaySLc4MlzpUBV8YXMMNpbkEWxyD7px2mwAI3BpJaaJ5bP m1aVBhXcZwpEud9Z900waEC5IIrfucFcI31wDO5BCoTvjkMATRXd6QhYwu9MD3MmT0/b HhbjoWnRvphmnWePA9CmRE5IXwci6lljkayJIU7VaaTIolJ2TRE8W4+AaMp3LNtxIvOr B/oFdXhaPSWfV5Ss3ds/Tu0ez9I35/k7VgTYip1VSZmJMdiWDlU83neORBMB69IBnyJE u8Nw== X-Forwarded-Encrypted: i=1; AKwUvBxexWXiuXIQca8e1gbSDE9GRi11YxXa0VsH+7a09RlsEBnRyFVFZCyIWE5WIGQ3UDO85CGyj++DgQBaNbE=@vger.kernel.org X-Gm-Message-State: AFuF++lpLUixUTDaIF6w40P0ZN2rq/IWnziZD6rPi5SclH9r3W3R8ggp EPj/l8d/3s2m/6vRc3Q1X2XaCRg6GT0uSgi6HpPseLUVL92OnpJ6HVzDRBxd4fzGa9DUdy46+Fg HRXdTVcpiEcpG7OLvenIbsqJPBg== X-Received: from ejrs22.prod.google.com ([2002:a17:906:6c96:b0:c25:19d1:3b10]) (user=snehalreddy job=prod-delivery.src-stubby-dispatcher) by 2002:a17:907:6d06:b0:c21:9b4b:2690 with SMTP id a640c23a62f3a-c2a156a963cmr1038418866b.17.1790009277272; Mon, 21 Sep 2026 09:47:57 -0700 (PDT) Date: Mon, 21 Sep 2026 16:47:46 +0000 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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" 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