From nobody Sun Oct 5 05:31:09 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 4863B2777FC; Sat, 9 Aug 2025 02:33:33 +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=1754706813; cv=none; b=ZoSyWvmC0nUq07CMjNsuzqfOyvxGjjsu5cdzW15iGi4BWZFGJA+HOjW7CLYlA82iSihRCERUHrIY/q1X5fn2/e97kxR8WNeIbAd1F30RnL2lMzBWW5NxvUySV6KB36BCEzv5Tl08laPzJiKHiJw+KOaXHfZMRqzaGoqUEV8LSV0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754706813; c=relaxed/simple; bh=xEPeB7qGHmvf4hEcftZI6cvTrD1NkDZPhJX4AIec5Dw=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Kup9cK26L9cf8V/vWdSXXJxh8dKCXrSAUDtQjHt8hFcLnaVN9/j7aq7/gNGmhuPnyMBttKyrPd/FysKWPjDsRAio/S2+6mI9fdo9YfPQtEsSerNTtU4yJiMPKnhXeQGV5146hRiMWXdlhaD4S6pB9aNCIs3MT1jgE8oQLydRXWQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JfHM7hMK; 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="JfHM7hMK" Received: by smtp.kernel.org (Postfix) with ESMTPS id D6489C4CEFD; Sat, 9 Aug 2025 02:33:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754706812; bh=xEPeB7qGHmvf4hEcftZI6cvTrD1NkDZPhJX4AIec5Dw=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=JfHM7hMK/RKWRPe77LaFJKtG/14M3y64v2tPZ42aQzlFlGwfmUBYjAt/RZElLK2Zz nkjq0+nzzgaR7/zy7DFh3UkvUZI7UQUbFWJu5wJkxazOMbKzdB2q9iMLCNYMLExT04 asCla5oahuvwmdmCvnx5kR4okiSO6+87yloFUV/j2JpXoyAfy64iZhlPqu1520FVMR E5R04UUuRdwivseHGE5FB45F2dFnd8HGuMutdk2rRFYlf+L6mK9Jjd7M3bR3INQM0g N0qlo1xS5MGaFO0VPFgF8xL/qKT+GclYAUCT1dnaU5FHF9nw8czuHZhHJ99csN8WQo nhdd9I3pN5sBg== 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 CED41CA0EC1; Sat, 9 Aug 2025 02:33:32 +0000 (UTC) From: Per Larsen via B4 Relay Date: Sat, 09 Aug 2025 02:33:23 +0000 Subject: [PATCH v10 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: <20250809-virtio-msg-ffa-v10-5-189eeecf8ae8@google.com> References: <20250809-virtio-msg-ffa-v10-0-189eeecf8ae8@google.com> In-Reply-To: <20250809-virtio-msg-ffa-v10-0-189eeecf8ae8@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=1754706812; l=1408; i=perlarsen@google.com; s=20250508; h=from:subject:message-id; bh=vELjMz0VHanHZyjHFhzZd2mcce5Zj2vh8Eki9ACAFco=; b=mPzO7QiZt52ZoyBspo220r8uI7g93su2IY0VqQ1vwlV6eBXS5EoAGWS/yBhDGPew+3efqKmF/ cZ6DUoIkz0+B3ccpjrK3n17FGPHKmVvYFADfXzhBjzvXPWAU23eT4Az 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 bcb2fab66a61190733682c5bda44e2fa6766177a..22a369f8d1d8edcde45d77377e2= 9dc08256c0bcc 100644 --- a/arch/arm64/kvm/hyp/nvhe/ffa.c +++ b/arch/arm64/kvm/hyp/nvhe/ffa.c @@ -734,7 +734,7 @@ 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.rc0.155.g4a0f42376b-goog