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Fri, 30 Nov 2018 18:07:04 +0000 Received: from DB7PR08MB3209.eurprd08.prod.outlook.com ([fe80::dd06:f986:fcee:10f1]) by DB7PR08MB3209.eurprd08.prod.outlook.com ([fe80::dd06:f986:fcee:10f1%2]) with mapi id 15.20.1382.020; Fri, 30 Nov 2018 18:07:04 +0000 From: Catalin Marinas To: Julien Thierry CC: "linux-arm-kernel@lists.infradead.org" , "daniel.thompson@linaro.org" , Marc Zyngier , Suzuki Poulose , Will Deacon , "linux-kernel@vger.kernel.org" , Christoffer Dall , James Morse , "joel@joelfernandes.org" Subject: Re: [PATCH v6 02/24] arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature Thread-Topic: [PATCH v6 02/24] arm64: cpufeature: Set SYSREG_GIC_CPUIF as a boot system feature Thread-Index: AQHUen7nxGZoDoW8kUyngIYWbbyzbqVouf4A Date: Fri, 30 Nov 2018 18:07:04 +0000 Message-ID: <20181130180702.GL43329@arrakis.emea.arm.com> References: <1542023835-21446-1-git-send-email-julien.thierry@arm.com> <1542023835-21446-3-git-send-email-julien.thierry@arm.com> In-Reply-To: <1542023835-21446-3-git-send-email-julien.thierry@arm.com> Accept-Language: en-GB, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mutt/1.10.1 (2018-07-13) x-originating-ip: [217.140.106.54] x-clientproxiedby: CWLP265CA0238.GBRP265.PROD.OUTLOOK.COM (2603:10a6:401:4f::34) To DB7PR08MB3209.eurprd08.prod.outlook.com (2603:10a6:5:1e::31) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Catalin.Marinas@arm.com; 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received-spf: None (protection.outlook.com: arm.com does not designate permitted sender hosts) x-microsoft-antispam-message-info: HaFahx8iif/hodmP/+xw7csDrauCoQYCKKMYGHI25zItbjg+kgfXUhNHEYS1JSAMrVqWD/Mc3UgwaGD3G3l3Fpj2jBmeVo8vjhm0nG5dhG8tvhFiBIfE+Mx7CxnRgiDJR8bwNY72vgbZGPqkL3MGBB0agnAcAC8CtaOD6BBopwUuxMTEDSKZGzJXHjjx//yx7iOeBdbvzHQwKmSLsQlFrr2bXZw6BvEai+3CS0jEFO81RVOcchYsJYYdlSCMTIOwiSv2am/8zsLcUW1qnbVznySLxm8p9AuXZItoJ2MQYfh+B5E6E1M9Ts8mewolAJ21uWBnO6HBYmjqH7wheoix+5/151X9u5yOXSXuucKfBQI= spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="us-ascii" Content-ID: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-Network-Message-Id: ec494ea7-c26d-46a1-15a9-08d656eea234 X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Nov 2018 18:07:04.7406 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-Transport-CrossTenantHeadersStamped: DB7PR08MB2969 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 12, 2018 at 11:56:53AM +0000, Julien Thierry wrote: > It is not supported to have some CPUs using GICv3 sysreg CPU interface > while some others do not. > > Once ICC_SRE_EL1.SRE is set on a CPU, the bit cannot be cleared. Since > matching this feature require setting ICC_SRE_EL1.SRE, it cannot be > turned off if found on a CPU. > > Set the feature as STRICT_BOOT, if boot CPU has it, all other CPUs are > required to have it. > > Signed-off-by: Julien Thierry > Suggested-by: Daniel Thompson > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Suzuki K Poulose > Cc: Marc Zyngier Acked-by: Catalin Marinas IMPORTANT NOTICE: The contents of this email and any attachments are confid= ential and may also be privileged. If you are not the intended recipient, p= lease notify the sender immediately and do not disclose the contents to any= other person, use it for any purpose, or store or copy the information in = any medium. Thank you.