From mboxrd@z Thu Jan 1 00:00:00 1970 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 E98E2155A30; Wed, 20 Aug 2025 22:28:33 +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=1755728914; cv=none; b=GH/yy7J4cwwO4lw9L4c9tKUkLRF56atwOgh7GmXD4a7ONjvBKwVHMNF3kQLt5d2mifZwhA9Hvf5Pn6AHd8Cd8+g5++M7blnzQVYLjEpMxezgjXr3cCjzs9/TH6RwdBaDNmNHi3hIfrhIWGmnQtlOAdHdoLKYRRSJIAT/ryC/glw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755728914; c=relaxed/simple; bh=PjVVrFOvOrmZlky6gvsbAAlEHD3EctTHJhm2W439Kxk=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=Tx1gqKfDO+w7oqIwXUrkZbrD7kby902Jzo2iHR2/Py6LNDiXILg4S7PBtKBHpo0c05k+mWXh5L4iktfCQ/23LSl2ByZYJTKkkmGlrPkh2u7d97OU5yIxAPwB3smmdjN/pavgbnyqfpVInplQu2e0SpCglKr0ThajstuR9Y++/C0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lc4O/ib2; 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="lc4O/ib2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 69E07C4CEE7; Wed, 20 Aug 2025 22:28:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755728913; bh=PjVVrFOvOrmZlky6gvsbAAlEHD3EctTHJhm2W439Kxk=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=lc4O/ib2w/vfzDHVAfmaSHpPIDx36lt3h8vuYfnXugwtpkpDulA4cPd2Z3p3GnRV+ GO5PeEQ6Z+4ruPMKy0+Uno5hqiYIr7DEV+D7V8EehvfO9SrQTrFNAVTyT6fsIF2hao AcTZIxoLdYUmv5Dg2uLmvaiJq6SIImz2UodZI8dlHIkEvFUN6wrZPqtZn5yjhysIsL bzAqBMYPedl51B0btQ0wUnUsCFhlMukZ81WH0RX3xeUMMwLh4CFGQwO7sVTb++jK14 HV4Vf1aU2Fb3iARaQytpx71bK2XYg0TTWYo+FkVSS+yU8Q11DktM+HQS/qpkZcyrxE DT1/iNTw79MOA== Received: from host86-149-246-145.range86-149.btcentralplus.com ([86.149.246.145] helo=lobster-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1uorIF-009WB8-54; Wed, 20 Aug 2025 23:28:31 +0100 Date: Wed, 20 Aug 2025 23:28:30 +0100 Message-ID: <87h5y1k4q9.wl-maz@kernel.org> From: Marc Zyngier To: Mark Brown Cc: Catalin Marinas , Will Deacon , Oliver Upton , Joey Gouly , Suzuki K Poulose , Shuah Khan , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v15 1/6] arm64/gcs: Ensure FGTs for EL1 GCS instructions are disabled In-Reply-To: <87ikihk4x3.wl-maz@kernel.org> References: <20250820-arm64-gcs-v15-0-5e334da18b84@kernel.org> <20250820-arm64-gcs-v15-1-5e334da18b84@kernel.org> <87ikihk4x3.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 86.149.246.145 X-SA-Exim-Rcpt-To: broonie@kernel.org, catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, shuah@kernel.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Wed, 20 Aug 2025 23:24:24 +0100, Marc Zyngier wrote: > > On Wed, 20 Aug 2025 15:14:41 +0100, > Mark Brown wrote: > > > > The initial EL2 setup for GCS did not include disabling of EL1 usage of > > GCS instructions, also disable these traps. This is the first disabling > > of instruction traps, use x2 to store the value to be written. > > Written where? Gah, I was looking at 6.16, not 6.17-rc1. Apologies for the noise. M. -- Jazz isn't dead. It just smells funny.