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Thu, 2 Apr 2026 23:38:18 +0000 Received: from DS7PR19MB6351.namprd19.prod.outlook.com ([fe80::f45e:e7d6:d522:3d08]) by DS7PR19MB6351.namprd19.prod.outlook.com ([fe80::f45e:e7d6:d522:3d08%3]) with mapi id 15.20.9769.018; Thu, 2 Apr 2026 23:38:18 +0000 From: "Rose, Charles" To: Ben Horgan 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" Subject: RE: [PATCH v6 00/40] arm_mpam: Add KVM/arm64 and resctrl glue code Thread-Topic: [PATCH v6 00/40] arm_mpam: Add KVM/arm64 and resctrl glue code Thread-Index: AQHcsviCWpaD3S4DS0+oknPXpOz+F7XMhTAA Date: Thu, 2 Apr 2026 23:38:18 +0000 Message-ID: References: <20260313144617.3420416-1-ben.horgan@arm.com> In-Reply-To: <20260313144617.3420416-1-ben.horgan@arm.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_73dd1fcc-24d7-4f55-9dc2-c1518f171327_Enabled=True;MSIP_Label_73dd1fcc-24d7-4f55-9dc2-c1518f171327_SiteId=945c199a-83a2-4e80-9f8c-5a91be5752dd;MSIP_Label_73dd1fcc-24d7-4f55-9dc2-c1518f171327_SetDate=2026-04-02T23:08:06.0000000Z;MSIP_Label_73dd1fcc-24d7-4f55-9dc2-c1518f171327_Name=No Protection (Label Only) - Internal Use;MSIP_Label_73dd1fcc-24d7-4f55-9dc2-c1518f171327_ContentBits=3;MSIP_Label_73dd1fcc-24d7-4f55-9dc2-c1518f171327_Method=Standard x-ms-publictraffictype: Email x-ms-traffictypediagnostic: DS7PR19MB6351:EE_|PH7PR19MB8139:EE_ x-ms-office365-filtering-correlation-id: 71f112c3-95a9-41c7-a266-08de9110eb00 x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014|786006|38070700021|18002099003|22082099003|56012099003; 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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 bein= g > used and the fix requires a change in fs/resctrl. The setting of MPAM2_EL= 2 > (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 PowerEdg= e XE8712 with NVIDIA Grace A02P. Both seem to work as expected. For the series: Tested-by: Charles Rose Thanks, Charles Internal Use - Confidential