From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=217.140.110.172 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793308464; b=nS1iDsJPLrJHnf9oirPIxx+wuwdAOpoNhjVESZifWG2DGimJT3rpGmlm/bx7xwQSjObx Qn5Q4FPaVw6t2dNXUQkyFgGgPn++q/sx+PLZOPLk2dFFTinZq1MP/aKZg5nrlYqCTEk++ PCuafbEFOJ33xdD+Lh4OZZ4UJ3kcLF0YBCKteWRaKaXemms4Jsuwlj0rNpATS3Gwe4uZ6 xfy5ym8JFyyOvPRFNxB+mV/p3ttORk0MYDBhtSeznIJuyF5cd2GcacS2e+kd4vQnsmiKl g93m1rCnNqJa8K+Vv4o34qG/OqSKV0lg0EXqFSxILEkNkDIoi+sb+40Jb/KZVYdGETQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793308464; h=DMARC-Filter:Received:Received:DKIM-Signature:Date:From:To:Cc: Subject:Message-ID:References:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; bh=7pzjhtn6j5+N8CZXLk0hQRmO9CNlQSOA3omzcm5VGk0=; b=RgUAY2+jhzgKqbtFEtE39ikSD2BdpYjuRf1Cak1najrRl6elHu1iG/rIbXCJut4/lPUQ e3uUBNEW2n1FGI9aeSrN3iJkzY5yz6ymQNfca/zp4c46a85SOajnq1nt1fz/kNuNWnbRg IJnV1iuss2kSL1AG0k9XVlcc/IYMgYN1PVCW7S/GScnrf81yuF4bMmEalDes3L6bBH72a o1uu0auC2KN0IFX+TXEtHvuy9fdO9EFwZow9HM2jS5FyRFRRYMUUKBagSzfSsRJdC5B1R acoV7/Jd5C5SfiV1ZSpHJvIxowNC6xJG5QC+m+4ElbJ0cdgW6vzIlUbInIId/Ua0VPg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=p9DS9Eak; arc=none smtp.remote-ip=217.140.110.172 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id B8172606A31D; Thu, 29 Oct 2026 21:14:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org B8172606A31D Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=arm.com header.i=@arm.com header.a=rsa-sha256 header.s=foss header.b=p9DS9Eak 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-Mailing-List: kvm@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261025075138.2919734-2-fuad.tabba@linux.dev> 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