From nobody Sat Oct 4 06:35:21 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DAEAF1A9FB4; Wed, 20 Aug 2025 01:10:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755652212; cv=none; b=NOh5Fb2GwTeHKhHT68Y6b7Rxo0/4URtu67s0HhDz/F3TKGOua+me2dZcQb6x4jdRlN5/5+ACO2Gz1226/vkF70LDfc0OVzOTlWlkkKpnf7VniYQ8qKZifuW3jMA0C/21IVW5gp2pGog+aQkPfSuplyEgX7iZPQ55iLm+DCzpUko= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755652212; c=relaxed/simple; bh=4aIBTPvj3mlS0mFSQkiL9HbPQJIP8JJJzPIipzWkWOk=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=g6HnUClSez3g//XMUXnGsvvLWgFUElfd1DV4V31ZzPB9JpvsI737HghJmCim28DzNJ2Xoj8RcDaejtE9oQ4wADEuDdkfYdm0FcJYepszjd7RN+Z3AhBTPIQwF7UKcCwnAKsvB7LMhj9Nc8ktOjN+up/qgOBv07tJeBZHD1ZZn0A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=GzaaHHDL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="GzaaHHDL" Received: by smtp.kernel.org (Postfix) with ESMTPS id 8DA43C116D0; Wed, 20 Aug 2025 01:10:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755652212; bh=4aIBTPvj3mlS0mFSQkiL9HbPQJIP8JJJzPIipzWkWOk=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=GzaaHHDLfhUnLJbQKiPeZehfprLhYrBCe9jn1LXOT2K5sveDm0/Qfgc8Fq0bbM0KF qyEkgfEnDH43srRVKQ/Kks6V3HpF9Z/9tnj3tHjDH5yaecrgS4usH/ufgz51IqsENi /9TzQVcx9RO/9OhKV2DnK5rxOfQuhMXdToRGFB5GcYHmHtPFmvfJc5q1rlpd6Zrqn5 +NCyDVEgC7awb+YTNmPr7OjtdeVvipcjyUK7xnFpqzeKeenfTeENL8iE8UNLuvb6B+ 4HD4Fs/Cy6NCaRI0qRhIe7/7RKw+CBnZar5jxENas5KSgnPyFILOsESCrnJUY2MVAf 8V0QoOXasfcPw== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85674CA0EEB; Wed, 20 Aug 2025 01:10:12 +0000 (UTC) From: Per Larsen via B4 Relay Date: Wed, 20 Aug 2025 01:10:09 +0000 Subject: [PATCH v11 5/6] KVM: arm64: Mask response to FFA_FEATURE call Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250820-virtio-msg-ffa-v11-5-497ef43550a3@google.com> References: <20250820-virtio-msg-ffa-v11-0-497ef43550a3@google.com> In-Reply-To: <20250820-virtio-msg-ffa-v11-0-497ef43550a3@google.com> To: Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Sudeep Holla Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, ahomescu@google.com, armellel@google.com, arve@android.com, ayrton@google.com, qperret@google.com, sebastianene@google.com, qwandor@google.com, Per Larsen X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1755652211; l=1408; i=perlarsen@google.com; s=20250508; h=from:subject:message-id; bh=3+r7TtwJ1pvrBzvbuh6WKHBBgdJuz5zMPQcaMPudbmc=; b=oL6lSKpTwfPP5RproVmd6Kyn1Qhr93I9kYWFlPEIJc4+cwaIz9LywwGKcsoEfOCO0kfbPhwLx Hrsx9+U9Gk4Dw99/TMvf1seMeHsl8tP6wke67qGrvkKpYwqBYeNrBA7 X-Developer-Key: i=perlarsen@google.com; a=ed25519; pk=jjc/Ta4VmrLRmMoahP6d1mBcKzvWU+nsmdtYe2oS2kQ= X-Endpoint-Received: by B4 Relay for perlarsen@google.com/20250508 with auth_id=402 X-Original-From: Per Larsen Reply-To: perlarsen@google.com From: Per Larsen The minimum size and alignment boundary for FFA_RXTX_MAP is returned in bit[1:0]. Mask off any other bits in w2 when reading the minimum buffer size in hyp_ffa_post_init. Acked-by: Will Deacon Signed-off-by: Per Larsen --- arch/arm64/kvm/hyp/nvhe/ffa.c | 2 +- include/linux/arm_ffa.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kvm/hyp/nvhe/ffa.c b/arch/arm64/kvm/hyp/nvhe/ffa.c index 96109aa99c48741e45a2b85d8e7bf26440597398..a8ec1a94f3f8a86551895f46069= 18246c4ac1f39 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -739,7 +739,7 @@ static int hyp_ffa_post_init(void) if (res.a0 !=3D FFA_SUCCESS) return -EOPNOTSUPP; =20 - switch (res.a2) { + switch (res.a2 & FFA_FEAT_RXTX_MIN_SZ_MASK) { case FFA_FEAT_RXTX_MIN_SZ_4K: min_rxtx_sz =3D SZ_4K; break; diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h index e1634897e159cdc208931938649eb0fb04d5a070..cd7ee4df9045dceca1c4e0dca2d= 533b770b1b056 100644 --- a/include/linux/arm_ffa.h +++ b/include/linux/arm_ffa.h @@ -128,6 +128,7 @@ #define FFA_FEAT_RXTX_MIN_SZ_4K 0 #define FFA_FEAT_RXTX_MIN_SZ_64K 1 #define FFA_FEAT_RXTX_MIN_SZ_16K 2 +#define FFA_FEAT_RXTX_MIN_SZ_MASK GENMASK(1, 0) =20 /* FFA Bus/Device/Driver related */ struct ffa_device { --=20 2.51.0.rc1.167.g924127e9c0-goog