From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9C67213B2BF; Thu, 15 Feb 2024 22:53:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708037619; cv=none; b=gK0zHn9YaZTmuPy7RQ5cLU051IGlFUc3c7mNsetlxzyaULXP2VvtCfnCBtDaYn2c6/XhxuVfbDPrljZ7aDqhfT6EZp3aLpH18yBhoTz7nIlHxM9E2t3ewQDxpMfv2xEacPKD6ifjFJXl67oL5qkRz5BreMUBxL7WCrGU4F170SQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708037619; c=relaxed/simple; bh=rUWuyqvYLXDrlUVnh5hZsDQvx7f4dgjjbHfhFcrcDdE=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=ZBuvY/R/RbUBE3ZOtbGrxFLMgB1aiwkiece18xOndttr+pfKXtI2BE/bY4ofs3nLXhqHY8JirJc4ZMveJQ+4noUK3aPqxTjhokEvQRJzExuFjyDQND8BRcggwVzwsEzn37jNHNKolRskAY7Nf5pVp+mb1+xt/XB78wULPvEVxxY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=pmAz6Pz7; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="pmAz6Pz7" Received: from [100.64.201.39] (unknown [20.29.225.195]) by linux.microsoft.com (Postfix) with ESMTPSA id C773020B2000; Thu, 15 Feb 2024 14:53:36 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com C773020B2000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1708037617; bh=CiJoh5nLY9w4ZLUhjoAD3yt82tHarGa4oEGpH+oxCsw=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=pmAz6Pz7oV3RhM3USNZQ0wb8AA62St+0eW+k3/jxNYTU1MCMDqmOa/BW7BjQyyqQ6 4mWlylw5SlV3mGkk4ZPGx3pQ6gEhp4dcMfoFBMMEsP0J3jlYtMu6ORVw3EHK52kFWJ Gm/s6nKNiwerC7Qvsu4XUFEMxAS21wKxGkl1Yknw= Message-ID: Date: Thu, 15 Feb 2024 14:53:36 -0800 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: Subscribe Microsoft Azure Cobalt 100 to ARM Neoverse N2 errata Content-Language: en-US From: Easwar Hariharan To: Oliver Upton Cc: Catalin Marinas , Will Deacon , Jonathan Corbet , Marc Zyngier , Andre Przywara , Rob Herring , Zenghui Yu , Mark Rutland , "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" , "open list:DOCUMENTATION" , open list , Anshuman Khandual , stable@vger.kernel.org References: <20240212232909.2276378-1-eahariha@linux.microsoft.com> <18b3ac3e-2bfc-4fce-9be4-3e75e487f9fc@linux.microsoft.com> In-Reply-To: <18b3ac3e-2bfc-4fce-9be4-3e75e487f9fc@linux.microsoft.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/13/2024 4:19 PM, Easwar Hariharan wrote: > On 2/12/2024 3:44 PM, Oliver Upton wrote: >> Hi Easwar, >> >> On Mon, Feb 12, 2024 at 11:29:06PM +0000, Easwar Hariharan wrote: >>> Add the MIDR value of Microsoft Azure Cobalt 100, which is a Microsoft >>> implemented CPU based on r0p0 of the ARM Neoverse N2 CPU, and therefore >>> suffers from all the same errata. >> >> Can you comment at all on where one might find this MIDR? That is, does >> your hypervisor report the native MIDR of the implementation or does it >> repaint it as an Arm Neoverse N2 (0x410FD490)? > > We will check on the Microsoft hypervisor's plans, and get back to you. > > Notwithstanding that, we do have baremetal use cases for Microsoft Azure Cobalt 100 > as well where this MIDR value will show through. > We checked in with our Microsoft hypervisor colleagues, and they do repaint the Azure Cobalt 100 as an Arm Neoverse N2, but again, we do have baremetal use cases. Thanks, Easwar 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 AC2DEC48BC4 for ; Thu, 15 Feb 2024 22:53:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:References:Cc:To:From: 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=8K16QpG6Ofs5CP3GuVh+LQ2lzmdeYQV+SE3bxS6aXVc=; b=ImKkDfwgBU6nle 32vVQV6T2XhzDQZLmGGoVKnHJfIwc81TpYI915UtLpX3RYp3zKYY5xezawBAKVM7Tmkw17A3bjKSQ K1zNsE9AEJAslkCOHEhNeh4aJLEgw+HdksC5p+Z3eHYSPu4Aw2pcOC/msTNcEaDaRv7vtX8z37JEx Abe/N7OhRUGlIMuc2uYMINoAFo8qPgpiwQZ8e4tj08qZSL+2ZpCllT2uRzTAn2RKGXuHK++F+SXVj havoeGbSUEVS4a++k6uyDsKFiYG2Wv59+SF6ua4WSvC37MsuKLSTHCij+qD5ytruWWEfsQvYXf0WN UBomj8B5VcX5mlw34CLQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rakbx-00000000OLz-3zol; Thu, 15 Feb 2024 22:53:45 +0000 Received: from linux.microsoft.com ([13.77.154.182]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rakbs-00000000OJb-2osQ for linux-arm-kernel@lists.infradead.org; Thu, 15 Feb 2024 22:53:42 +0000 Received: from [100.64.201.39] (unknown [20.29.225.195]) by linux.microsoft.com (Postfix) with ESMTPSA id C773020B2000; Thu, 15 Feb 2024 14:53:36 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com C773020B2000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1708037617; bh=CiJoh5nLY9w4ZLUhjoAD3yt82tHarGa4oEGpH+oxCsw=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=pmAz6Pz7oV3RhM3USNZQ0wb8AA62St+0eW+k3/jxNYTU1MCMDqmOa/BW7BjQyyqQ6 4mWlylw5SlV3mGkk4ZPGx3pQ6gEhp4dcMfoFBMMEsP0J3jlYtMu6ORVw3EHK52kFWJ Gm/s6nKNiwerC7Qvsu4XUFEMxAS21wKxGkl1Yknw= Message-ID: Date: Thu, 15 Feb 2024 14:53:36 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] arm64: Subscribe Microsoft Azure Cobalt 100 to ARM Neoverse N2 errata Content-Language: en-US From: Easwar Hariharan To: Oliver Upton Cc: Catalin Marinas , Will Deacon , Jonathan Corbet , Marc Zyngier , Andre Przywara , Rob Herring , Zenghui Yu , Mark Rutland , "moderated list:ARM64 PORT (AARCH64 ARCHITECTURE)" , "open list:DOCUMENTATION" , open list , Anshuman Khandual , stable@vger.kernel.org References: <20240212232909.2276378-1-eahariha@linux.microsoft.com> <18b3ac3e-2bfc-4fce-9be4-3e75e487f9fc@linux.microsoft.com> In-Reply-To: <18b3ac3e-2bfc-4fce-9be4-3e75e487f9fc@linux.microsoft.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240215_145340_843670_D904C8CD X-CRM114-Status: GOOD ( 10.24 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/13/2024 4:19 PM, Easwar Hariharan wrote: > On 2/12/2024 3:44 PM, Oliver Upton wrote: >> Hi Easwar, >> >> On Mon, Feb 12, 2024 at 11:29:06PM +0000, Easwar Hariharan wrote: >>> Add the MIDR value of Microsoft Azure Cobalt 100, which is a Microsoft >>> implemented CPU based on r0p0 of the ARM Neoverse N2 CPU, and therefore >>> suffers from all the same errata. >> >> Can you comment at all on where one might find this MIDR? That is, does >> your hypervisor report the native MIDR of the implementation or does it >> repaint it as an Arm Neoverse N2 (0x410FD490)? > > We will check on the Microsoft hypervisor's plans, and get back to you. > > Notwithstanding that, we do have baremetal use cases for Microsoft Azure Cobalt 100 > as well where this MIDR value will show through. > We checked in with our Microsoft hypervisor colleagues, and they do repaint the Azure Cobalt 100 as an Arm Neoverse N2, but again, we do have baremetal use cases. Thanks, Easwar _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel