From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5BD9D606A31A for ; Thu, 29 Oct 2026 21:14:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=mIyuApE2; dkim=pass (1024-bit key, unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=p9DS9Eak 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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; bh=7pzjhtn6j5+N8CZXLk0hQRmO9CNlQSOA3omzcm5VGk0=; b=mIyuApE2x3fk6w20q+iNUAXVv7 n+YZg7JfxdR3NuFAFdR4e1ArQ3xojmDzryu4TMxjOKauPVb9BtSdlzfIPRmPre/okIGO1uXoQHhvO NIRFvVcodFOGsQN+aTTMi2rFQBAKqyCsY6/Yz5XF6gY+CffnE50DKWbfKus2PvmsHcJU20VoEmu58 2zcK0/gXOoaonbHuxSWNhoR6jHs9z3b+YXr0pBsJ9BGau7snJ3UcFcrID1gqv3YUqCB0jdVBnQ5ui VlRb+ApfqgBqnA4jnhpNITa8A45xue2Aws7Idvhiu2RG+Ym0FnZdrSKx6hpXYi5qxoafUBUhXyPGa Vznpr4eQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xMXS6-0000000AOm2-3tVC; Thu, 29 Oct 2026 21:14:26 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xMXS4-0000000AOlU-2Yds for linux-arm-kernel@lists.infradead.org; Thu, 29 Oct 2026 21:14:25 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id D38FC1682; Thu, 29 Oct 2026 14:14:19 -0700 (PDT) Received: from arm.com (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D06203F59E; Thu, 29 Oct 2026 14:14:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1793308462; bh=38wAcV6+Pv6BUffZcJjTOzperonmticUwGom7ntWZAI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=p9DS9EakVP9HFrT+Dq5D5QflP8AsibvK4b16nw+3P+LFEwVRxQqTVKObaNvyb75GT Ek0Tw96E1T0R93ckTjFwoUcsTGJGeiERUvjdZYnZsTL3mmN9rXtnrZImSR4jRyjMft vJQ26MLNCQ6XqAljjKT5k0Edby4PnzN4T+fDm2Fg= Date: Thu, 29 Oct 2026 21:14:18 +0000 From: Catalin Marinas To: Fuad Tabba Cc: Marc Zyngier , Oliver Upton , kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Will Deacon , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Steffen Eiden , Mark Rutland , Yicong Yang , Zhou Wang , Arnd Bergmann , Fuad Tabba , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 1/5] arm64: Add override for ID_AA64ISAR1_EL1.LS64 Message-ID: References: <20261025075138.2919734-1-fuad.tabba@linux.dev> <20261025075138.2919734-2-fuad.tabba@linux.dev> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261025075138.2919734-2-fuad.tabba@linux.dev> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20261029_141424_701205_45C5E747 X-CRM114-Status: GOOD ( 11.76 ) X-Spam-Score: -4.4 (----) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-10.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Sun, Oct 25, 2026 at 07:51:34AM +0000, Fuad Tabba wrote: > Accesses to ACCDATA_EL1, which FEAT_LS64_ACCDATA adds, trap to EL3 > unless firmware sets SCR_EL3.ADEn. Once KVM context-switches the > register for its guests, a host whose firmware leaves the bit clear > can't run them. > > Add an override for ID_AA64ISAR1_EL1.LS64, with an arm64.nols64 alias, > so that the feature can be disabled on such a host and for its guests. > id_aa64isar1.ls64=2 disables only FEAT_LS64_ACCDATA and above. > > Cc: stable@vger.kernel.org > Signed-off-by: Fuad Tabba Acked-by: Catalin Marinas However, does this need a plain cc stable? I assume you want it to go in with patch 3 but that one only goes as far as 7.0. Same cc stable in patch 2 which you may want to limit (or add both as dependencies to the cc stable in patch 3 when committing). -- Catalin