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Received: from BYAPR12MB2661.namprd12.prod.outlook.com (2603:10b6:a03:67::13) by DM6PR12MB4468.namprd12.prod.outlook.com (2603:10b6:5:2ac::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9160.18; Fri, 3 Oct 2025 18:58:35 +0000 Received: from BYAPR12MB2661.namprd12.prod.outlook.com ([fe80::f4fa:1948:9ea6:1ee2]) by BYAPR12MB2661.namprd12.prod.outlook.com ([fe80::f4fa:1948:9ea6:1ee2%5]) with mapi id 15.20.9160.017; Fri, 3 Oct 2025 18:58:35 +0000 Message-ID: <562d1f40-4ed9-4f5b-af1b-9de45e06079e@nvidia.com> Date: Fri, 3 Oct 2025 11:58:35 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 11/29] arm_mpam: Probe hardware to find the supported partid/pmg values To: James Morse , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org Cc: D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Dave Martin , Koba Ko , Shanker Donthineni , baisheng.gao@unisoc.com, Jonathan Cameron , Rob Herring , Rohit Mathew , Rafael Wysocki , Len Brown , Lorenzo Pieralisi , Hanjun Guo , Sudeep Holla , Catalin Marinas , Will Deacon , Greg Kroah-Hartman , Danilo Krummrich References: <20250910204309.20751-1-james.morse@arm.com> <20250910204309.20751-12-james.morse@arm.com> Content-Language: en-US From: Fenghua Yu In-Reply-To: <20250910204309.20751-12-james.morse@arm.com> Content-Type: text/plain; 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Future callers of this > will tell us about the SMMU and ITS. > > Signed-off-by: James Morse [SNIP] > @@ -113,6 +123,72 @@ static inline u32 _mpam_read_partsel_reg(struct mpam_msc *msc, u16 reg) > > #define mpam_read_partsel_reg(msc, reg) _mpam_read_partsel_reg(msc, MPAMF_##reg) > > +static void __mpam_write_reg(struct mpam_msc *msc, u16 reg, u32 val) > +{ > + WARN_ON_ONCE(reg + sizeof(u32) > msc->mapped_hwpage_sz); if reg + 4 == msc->mapped_hwpage_sz, the register is out of boundary as well. So the validation should be: WARN_ON_ONCE(reg + sizeof(u32) >= msc->mapped_hwpage_sz); [SNIP] Thanks. -Fenghua