From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id D04A73DEFE1; Mon, 13 Apr 2026 14:32:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776090772; cv=none; b=IqpaztUuIc3a1z399PUZHz6sEY/W/681MXe5eyopDOR6kXWXfEFyDodXBI9CLK0L124u1L6EC9pOywcLWXLoTfuGKQ3PY6KG9Ebq8VvNaMMYU/Z6ZpfBiPYrWl67USUSPh682KijbPO2L/kkXB2DTUILbLtXoc6QhfHAYCo6XOU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776090772; c=relaxed/simple; bh=7esCCBp/1znd/3tqEVLoiCm1WeU7CehMh8AEaX3CYEE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=meCEdf2v/oCWNQcThMsyYsZXgmHugI2oVRIgnVIdsn+2qyjywTZAp3Gh/1cISZMy3ho7rkFsbMNj9nAjhMXSPhNoQzdXaSWHxJqa7KA8GFGWXfQ4B425BVR0BpyAhTlC+dfkQEFSIByKveFBEUAM/XIP8yO98fPf/0u7CR7tuyo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=k4BtU/Q0; arc=none smtp.client-ip=217.140.110.172 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) header.d=arm.com header.i=@arm.com header.b="k4BtU/Q0" 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 7979E357A; Mon, 13 Apr 2026 07:32:44 -0700 (PDT) Received: from [10.1.196.46] (e134344.arm.com [10.1.196.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9CAAE3F641; Mon, 13 Apr 2026 07:32:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1776090770; bh=7esCCBp/1znd/3tqEVLoiCm1WeU7CehMh8AEaX3CYEE=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=k4BtU/Q0snstkGHJl172mBwQTR3q9jPRBVpFiOeH7UiXZtvFzMev4irKp6FbXlovt SqakMn2ZGK4kZYlg8xh/oQNnOtCy6HKHw49B32HzQE9VVmHfNXjL9AlodhGN2SoOVw 7Ass3DpEcmHG3uPOcqV6vH/qigUD3feVoVuhfw/Q= Message-ID: <992f8a41-14df-40e1-a7d6-e4337514800b@arm.com> Date: Mon, 13 Apr 2026 15:32:44 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Thunderbird Daily Subject: Re: [PATCH v6 00/40] arm_mpam: Add KVM/arm64 and resctrl glue code To: "Rose, Charles" Cc: "amitsinght@marvell.com" , "baisheng.gao@unisoc.com" , "baolin.wang@linux.alibaba.com" , "carl@os.amperecomputing.com" , "dave.martin@arm.com" , "david@kernel.org" , "dfustini@baylibre.com" , "fenghuay@nvidia.com" , "gshan@redhat.com" , "james.morse@arm.com" , "jonathan.cameron@huawei.com" , "kobak@nvidia.com" , "lcherian@marvell.com" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "peternewman@google.com" , "punit.agrawal@oss.qualcomm.com" , "quic_jiles@quicinc.com" , "reinette.chatre@intel.com" , "rohit.mathew@arm.com" , "scott@os.amperecomputing.com" , "sdonthineni@nvidia.com" , "tan.shaopeng@fujitsu.com" , "xhao@linux.alibaba.com" , "catalin.marinas@arm.com" , "will@kernel.org" , "corbet@lwn.net" , "maz@kernel.org" , "oupton@kernel.org" , "joey.gouly@arm.com" , "suzuki.poulose@arm.com" , "kvmarm@lists.linux.dev" , "zengheng4@huawei.com" , "linux-doc@vger.kernel.org" References: <20260313144617.3420416-1-ben.horgan@arm.com> Content-Language: en-US From: Ben Horgan In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Charles, On 4/3/26 00:38, Rose, Charles wrote: > Hi Ben, > >> This version of the mpam missing pieces series sees a couple of things >> dropped or hidden. Memory bandwith utilization with free-running counters >> is dropped in preference of just always using 'mbm_event' mode (ABMC >> emulation) which simplifies the code and allows for, in the future, >> filtering by read/write traffic. So, for the interim, there is no memory >> bandwidth utilization support. CDP is hidden behind config expert as >> remount of resctrl fs could potentially lead to out of range PARTIDs being >> used and the fix requires a change in fs/resctrl. The setting of MPAM2_EL2 >> (for pkvm/nvhe) is dropped as too expensive a write for not much value. >> >> There are a couple of 'fixes' at the start of the series which address >> problems in the base driver but are only user visible due to this series. >> > > I tested cache occupancy and memory bandwidth allocation on a Dell PowerEdge XE8712 with NVIDIA Grace A02P. Both seem to work as expected. > > For the series: > > Tested-by: Charles Rose Thanks for testing!