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=1793308524; b=tfs0BpchwR/RteM1AVfAGDoEo9z7lvcoTxKUevEWsA2THjHctx8+qlEJftTqb41k0ItC gruU+tzuipG0sCEZX+J92woHTGm1qfHzj5gZ8UQqfJwG1ZsMhxS7GRAHhCFleSPOIDwTh QVZXcEqIjJjIRZLe9QxvnH437TbNWQBqudwML3vh5MZM3d817QaOnCNgnAyuKBaKAP4EC XgMiHxi46AWxrePhCEZ0aSvv5GZ5CvF2uS4wi9dY8K7HY6BLN1KDiGqW38ZfydPSVT9KS jkWMwUnzUwIFb6nwPI/HT3TR9EWFkKV9+kXP3CuZ7XaQQxuXnmzo8SJvnp2ake2xQfA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793308524; 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=uUOoxh5FjWUwpph2LqQnLF50bqkpEqoE20tLRRD+3zY=; b=BEwbMm2CgIaOa9ySpY2Q2eN7YybplHW0fqChKknguhxFeDcekxCEW+CfMlC+WPVHqL5j QnPmfep25OC/yllQvoADzBeXsVxMVIb1EAicqY/1UzB89NjjNY+B3InP1hRuS61hY6tuG bmuUrnOOK6bIO+x7ItbPNflUrjLFP0Vecg02+mNGFT2wYUHgtMSZbG29XuB+6fsioE1pd CG3IptG56kGirNB8OGZVIL8/KfFIe/CroAHlWW059PYQtEKK76e7XGO9KzYIRDETyIQ8P QRra55GxV/fxrl/oKurjAe0Amvf0ZL3iNGkUnVRnnhGyeHDdc1GB+QqpYi1NKv//nAQ== 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=g8Ac2snP; 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 7F3BC606A323 for ; Thu, 29 Oct 2026 21:15:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 7F3BC606A323 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=g8Ac2snP 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 5F6711682; Thu, 29 Oct 2026 14:15:19 -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 5CED13F59E; Thu, 29 Oct 2026 14:15:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1793308522; bh=cLLb8kTBxnx4UA1bZ7blmuTf4w+v25p4Ofqywv52Tv8=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=g8Ac2snP/yP6eE1gMl5eSWsRnObRxt4TKvv7JwVEnOV/kho0T5s+Ll5cxuy0oypZS OzFHVvh/5N8rSHvnPETiD9ah02AzfUsabo/JDjP9K5JkXElI053yHln7/VWq8aKRCp QOatav4wSox4p9lwpJ4gSOt/tbvtIl1Wc8PtPt4c= Date: Thu, 29 Oct 2026 21:15:18 +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 3/5] KVM: arm64: Add context-switch of ACCDATA_EL1 Message-ID: References: <20261025075138.2919734-1-fuad.tabba@linux.dev> <20261025075138.2919734-4-fuad.tabba@linux.dev> X-Mailing-List: kvmarm@lists.linux.dev 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: <20261025075138.2919734-4-fuad.tabba@linux.dev> On Sun, Oct 25, 2026 at 07:51:36AM +0000, Fuad Tabba wrote: > From: Marc Zyngier > > Add ACCDATA_EL1 save/restore as part of the EL0 context. This is > conditioned on the guest's view of ID_AA64ISAR1_EL1.LS64 reporting > that this register is supported. > > Signed-off-by: Marc Zyngier > Fixes: 58ce78667a641 ("arm64: Add support for FEAT_{LS64, LS64_V}") > Link: https://lore.kernel.org/r/20240815125959.2097734-5-maz@kernel.org > Cc: stable@vger.kernel.org > [Fuad: rebased; switch ACCDATA_EL1 for guests only, as the host never > uses it; gate it on a new ARM64_HAS_LS64_ACCDATA capability, since > in pKVM the host controls a non-protected guest's ID registers, and > an EL2 access to ACCDATA_EL1 on a CPU without the feature is UNDEFINED] > Signed-off-by: Fuad Tabba Acked-by: Catalin Marinas