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 6C0EEC98302 for ; Wed, 23 Sep 2026 15:08:40 +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-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=h5qEuMX2AgfVj/zB737wgvO3fczJP+9mZX4O+p7Gui8=; b=Keu1x8NJgeBbHcY+h3yYwYBlqu jjPpcnKLJ5L6EEV2WzOpTSg51iAD2kObOcq2xc0AgpxOxLCiLcJ6jVVr6s2EVzD+MN0IIPu7iLI0n YMLqs6UywKioYfR3ttcCJJrRS7GDKMUtyZGO2nUjl3PInbdMG74QuEoaV0v+YWuWhwxV4nl6SvVo3 QZyN9ozxa2DkTtkJeY5itiB/bTlDtDrC+fGkjGN0Yv6GuODtorxdo/dWbPG3It1ExB2quud3l1IqO C5kh651cyJGh4UPUF65sU2ErHthF5Jjsj0qWiTNRfQjj6hATID/N7SC4lIXvkNUgMbaBEI46Z5E93 oTyo26aA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x9OaH-00000008dI9-1Kwh; Wed, 23 Sep 2026 15:08:33 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1x9OaE-00000008dHn-0UV8 for linux-arm-kernel@lists.infradead.org; Wed, 23 Sep 2026 15:08:31 +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 5311D1576; Wed, 23 Sep 2026 08:08:25 -0700 (PDT) Received: from [192.168.4.158] (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 911EE3F86F; Wed, 23 Sep 2026 08:08:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790176108; bh=edtWsNHFqIjdvZULam1O7IB7K582ntmW2xvpX9oL22I=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=iU4so09VsYwG4mfgnfjgyscGoaIH5dI/auxUcOj5+WeOxNFbRV3D/N0hk7AuSemUr LzjaY2DjeMua/Z1a8HVVBcmvGoUMrZN+AS9DP8LD+OMC4rRwpiX0pC65rMWXmRR6I9 UIwmVo7MsWUDnfODGoK/v7dAInTdKjmgt4XguVcc= Message-ID: Date: Wed, 23 Sep 2026 16:08:24 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v13 7/8] coco: guest: arm64: Add sysfs ABI for CCA Realm guests Content-Language: en-GB To: "Aneesh Kumar K.V (Arm)" , linux-coco@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Jason Gunthorpe , Catalin Marinas , Greg KH , Jeremy Linton , Jonathan Cameron , Lorenzo Pieralisi , Mark Rutland , Sudeep Holla , Sudeep Holla , Will Deacon , Steven Price , Andre Przywara , Herbert Xu , Nathan Chancellor , Nicolas Schier , Olivia Mackall , Russell King , Jonathan Cameron References: <20260923140405.1111554-1-aneesh.kumar@kernel.org> <20260923140405.1111554-8-aneesh.kumar@kernel.org> From: Suzuki K Poulose In-Reply-To: <20260923140405.1111554-8-aneesh.kumar@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260923_080830_283138_E7AB0C6A X-CRM114-Status: GOOD ( 10.75 ) 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 23/09/2026 15:04, Aneesh Kumar K.V (Arm) wrote: > Userspace has used the arm-cca-dev platform device to detect Arm CCA > Realm guests. Removing it without a replacement would break that > detection and would also leave userspace depending on kernel > device-model details. > > Add /sys/firmware/cca/realm_guest as a stable ABI for detecting whether > the kernel is running as an Arm CCA Realm guest. Create the file only in > Realm world, where it reads 1. > > Document the new ABI in Documentation/ABI/testing/sysfs-firmware-cca. > > Link: https://lore.kernel.org/all/4a7d84b2-2ec4-4773-a2d5-7b63d5c683cf@arm.com > Reviewed-by: Jonathan Cameron > Reviewed-by: Catalin Marinas > Reviewed-by: Jason Gunthorpe > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Mark Rutland > Signed-off-by: Aneesh Kumar K.V (Arm) Reviewed-by: Suzuki K Poulose