From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 134ACCFA466 for ; Mon, 24 Nov 2025 11:48:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: References:In-Reply-To:Subject:Cc:To:From:Message-ID:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=yh7NIs/WSUAmjpNEEuvUGYZh93bAk+E2set1knaUHs4=; b=KssMfOID87WF7bVwytMulwmlkB 8uMyJZSLyajIm9NT1BUg+aoeKa0wxX7xDLup1jq6KN6Czg5laX/3U53E71jmRjYwXMl5gQ3gxKlMZ f9DOrg6iMQXMv6nCggasT7N/8n86IxdCQQEYLibz3uAQs0OXNySb5xeY8uuq5cN2doatjTcOYIicd +NhT1kM6xZU1epXdvQiXthakeSzlHqccE50EQVxJ3sMc29RljJBADqWozHhkWjT+eG28FpmnZi10W 7JB4a5GmyOTPpUS/BhCswEtm0szXt4RqbiY5Lr1wgSGgmZwMltqRCrqhOBxzMqz6LBHTifB1HQTzb ltK5iGkg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vNV3S-0000000BZvd-2F8D; Mon, 24 Nov 2025 11:48:26 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vNV3Q-0000000BZvQ-36yX for linux-arm-kernel@lists.infradead.org; Mon, 24 Nov 2025 11:48:24 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id DF48560138; Mon, 24 Nov 2025 11:48:23 +0000 (UTC) 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) 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 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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.