From nobody Wed Dec 17 03:45:21 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 4FE031DC9A3; Sat, 19 Jul 2025 02:11:54 +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=1752891114; cv=none; b=n8pxf87cYl7x6iVO1gRtozXb61JZz55OpHWEyc4JVyvZtEzRJk1J6ejYzh/L4qVD/Q/N870R0sVbiMIlSGnaP3Xt+j6uxRZqm+mmOh077rsThJ7rwB42OVYhm11R4cvrjY2bdCvNTLyZ+gqgVSUBCnLZvf9jfCeK6LTRYzRs8BM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752891114; c=relaxed/simple; bh=Qkay+td2CTF8tiBwafQanjBkZb8hXhQmz0Ko/raVV7c=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=m+xMKqVdgO946HweuQbYESY/MbmsQw3i2Ne1TXnsLKR4hcOcfjODAAKIni9BpzRG0O6JdoFB2STaeBFfGybqIdil2H+tYbLmCcoAT3fZ/1ymufxlhp0Q4WrbWumnziZE92oTozvUJVd2v5iPp67d1y58IykkQoCR25Dnn9jLwUU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kvzBhPX2; 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="kvzBhPX2" Received: by smtp.kernel.org (Postfix) with ESMTPS id D9659C4CEFF; Sat, 19 Jul 2025 02:11:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752891113; bh=Qkay+td2CTF8tiBwafQanjBkZb8hXhQmz0Ko/raVV7c=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=kvzBhPX2As4S9PpPjzujySHMe3jFqms6HMlL0V9wpkpYHlWsxrHjO9A2MEYY2eLbh mEroUHMTA7LOsSDrqNMug+L0vFFnSHdZGYzahA6Vvkl/DHIDo8qMZYSLMmvBHlPltP j7X3xEDLpX5YHb8RfrhHyPyfnoKrCWKomCE68FZk2mPohdZ2el872gDANrEIWpKI5w cKLDKQlTeJAymtOSOmH/wMSwynhrOxQNZ90YfMlVunbB6jzAxYwi+kBX4aXJ6AXPc4 XT9NI+bklB9duXZFpDHsAnWe+3IoZSkWc9RnrL+D1yB1v9KaEgHLMDCPxpMl4l8zUn 0YKzI6KzZbJxw== 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 CB895C83F1A; Sat, 19 Jul 2025 02:11:53 +0000 (UTC) From: Per Larsen via B4 Relay Date: Sat, 19 Jul 2025 02:11:27 +0000 Subject: [PATCH v8 5/7] 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: <20250719-virtio-msg-ffa-v8-5-03e8e8dbe856@google.com> References: <20250719-virtio-msg-ffa-v8-0-03e8e8dbe856@google.com> In-Reply-To: <20250719-virtio-msg-ffa-v8-0-03e8e8dbe856@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=1752891112; l=1363; i=perlarsen@google.com; s=20250508; h=from:subject:message-id; bh=55yA/b9WaRmX85NmDdLJkZinkMYQwcAGAdUeGaUKBZ4=; b=sNeyafSSHUrLsmXTiUjqsrcfVjOFuY4rtzvyG/u1PdIsoRhxBd/haBBhQ1GbB2Dt0nX/m0MLl pbxXYv/TMoOA6/Y9FNIxafXa33hJUmsrt3XKiCqhCvmuwtgEaAsL8Mt 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. Signed-off-by: Per Larsen Acked-by: Will Deacon --- 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 5a173ea481940236356e2bc4248d094a858a0923..2cbecc9af5d27a9e7c8497001cf= 9b0987c72bdb4 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -733,7 +733,7 @@ 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 2.50.0.727.gbf7dc18ff4-goog