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 145E02FC891; Mon, 24 Nov 2025 11:48:23 +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=1763984904; cv=none; b=WjyocGtajJFqv2G3Fm+yZAk264yPE+loALk1V4rTJQ9xOoO0vfOeXptYYIxNsQZ5LkHvGz6f1grWlSPGewARoBBrjLrrIdzNvzwHMpd9/9nf5bskadO9Gvwd+lpz0glukAMRx38C0JajHLnrHCTeAu35wtZVFYBdkon11+bqghk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763984904; c=relaxed/simple; bh=fm8eKcgU59Lqj/73CT15p83zfcOtM57iiz6YiPB9l3g=; h=Date:Message-ID:From:To:Cc:Subject:In-Reply-To:References: MIME-Version:Content-Type; b=TqUlKLlsoIsIFF5owiF1+7gnsFudkNjB/eCChGMwXNcbDjY+9BNyrtD6UJzxP8iPgc0qrY/JuUjlX/+NINNoDXVtSrYpyzURsL4tugMPkpjGM6EJToHA8VNngmfuWkBj58JI8vbahVUQ/SVxiouxXoz8IQRL5nywXMVOCMIzTo0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=I2kdqteT; 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="I2kdqteT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B471C4CEF1; Mon, 24 Nov 2025 11:48:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763984903; bh=fm8eKcgU59Lqj/73CT15p83zfcOtM57iiz6YiPB9l3g=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=I2kdqteTk4749mFp5UOJjmN3KrINfddNofXHl1o88aBhT1iHeZFlwXclcAwhXUPOO GJzl+y3kD/CRi9Ccp8rozqJYrh5sEU+H8QpNb81A+yltN/nuAFL67655CVQ14zDfos o0+2PLCq6j066A376ueX29+vS7DsLGb5la3AUNkDjkZXcfbJv10CluTNAuB7NyKO8z kGi3iNm1Nrd45iHzYeTRWEaSv9UNJjL+aLqA69SuuvG3DrVnu7k27/Saa3v9Ma52Ye qGto4i76I/GzdHXq+x7aQiFNIvl/SXhPy0KB82tRHdFgc8owKGLzfzJtUf9xIwdGlK XnvjFZBMNFJfw== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1vNV3N-00000007pTs-186o; Mon, 24 Nov 2025 11:48:21 +0000 Date: Mon, 24 Nov 2025 11:48:20 +0000 Message-ID: <86qztnr6rf.wl-maz@kernel.org> From: Marc Zyngier To: Ben Horgan Cc: kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: Re: [PATCH 4/5] KVM: arm64: Report optional ID register traps with a 0x18 syndrome In-Reply-To: <576d088c-0176-41e5-a66c-8713f5cb09b7@arm.com> References: <20251120133202.2037803-1-maz@kernel.org> <20251120133202.2037803-5-maz@kernel.org> <576d088c-0176-41e5-a66c-8713f5cb09b7@arm.com> 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: kvm@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: 185.219.108.64 X-SA-Exim-Rcpt-To: ben.horgan@arm.com, kvmarm@lists.linux.dev, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Mon, 24 Nov 2025 10:41:56 +0000, Ben Horgan wrote: > > Hi Marc, > > On 11/20/25 13:32, Marc Zyngier wrote: > > With FEAT_IDST, unimplemented system registers must be reported using > > EC=0x18 at the closest handling EL, rather than with an UNDEF. > > I think this needs 'in the feature ID space' adding. Something like: > > With FEAT_IDST, unimplemented system registers in the feature ID space > must be reported using EC=0x18 at the closest handling EL, rather than > with an UNDEF. Ah, good point. I got (slightly) carried away! I'll fold these updates in. Thanks, M. -- Without deviation from the norm, progress is not possible.