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28 Jun 2019 18:05:13 +0000 Received: from EX13MTAUEB001.ant.amazon.com (pdx4-ws-svc-p6-lb7-vlan2.pdx.amazon.com [10.170.41.162]) by email-inbound-relay-2b-baacba05.us-west-2.amazon.com (Postfix) with ESMTPS id 72AC2A18E5; Fri, 28 Jun 2019 18:05:12 +0000 (UTC) Received: from EX13D08UEB004.ant.amazon.com (10.43.60.142) by EX13MTAUEB001.ant.amazon.com (10.43.60.96) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Fri, 28 Jun 2019 18:05:12 +0000 Received: from EX13D02UWC004.ant.amazon.com (10.43.162.236) by EX13D08UEB004.ant.amazon.com (10.43.60.142) with Microsoft SMTP Server (TLS) id 15.0.1367.3; Fri, 28 Jun 2019 18:05:11 +0000 Received: from EX13D02UWC004.ant.amazon.com ([10.43.162.236]) by EX13D02UWC004.ant.amazon.com ([10.43.162.236]) with mapi id 15.00.1367.000; Fri, 28 Jun 2019 18:05:10 +0000 From: "Saidi, Ali" To: Will Deacon , Mark Rutland Subject: Re: [PATCH 0/3] Add support for Graviton TRNG Thread-Topic: [PATCH 0/3] Add support for Graviton TRNG Thread-Index: AQHVGxR9rewpsnhufE+Qj7iDYwflKaaM+/mAgALbeQCAIVaegA== Date: Fri, 28 Jun 2019 18:05:10 +0000 Message-ID: <3104F396-094F-454C-8308-BF651FAB99AB@amazon.com> References: <20190604203100.15050-1-alisaidi@amazon.com> <20190605122031.GK15030@fuggles.cambridge.arm.com> <7EC45708-38A1-4826-BC82-298EFAAE30B1@amazon.com> In-Reply-To: <7EC45708-38A1-4826-BC82-298EFAAE30B1@amazon.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.43.161.147] Content-ID: <9B45E3D979865C468A2C17E957CEA6B4@amazon.com> MIME-Version: 1.0 Precedence: Bulk X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190628_110516_170265_3FD78C63 X-CRM114-Status: GOOD ( 11.80 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-arm-kernel@lists.infradead.org" , Herbert Xu , Arnd Bergmann , Greg Kroah-Hartman , Benjamin Herrenschmidt , Matt Mackall , "linux-kernel@vger.kernel.org" , "Rindjunsky, Ron" , "linux-crypto@vger.kernel.org" , Catalin Marinas , "Woodhouse, David" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 6/7/19, 7:59 AM, " Ali Saidi" wrote: On 6/5/19, 7:20 AM, "Will Deacon" wrote: On Tue, Jun 04, 2019 at 08:30:57PM +0000, Ali Saidi wrote: > AWS Graviton based systems provide an Arm SMC call in the vendor defined > hypervisor region to read random numbers from a HW TRNG and return them to the > guest. > > We've observed slower guest boot and especially reboot times due to lack of > entropy and providing access to a TRNG is meant to address this. Curious, but why this over something like virtio-rng? This interface allows us to provide the functionality from both EL2 and EL3 and support multiple different types of our instances which we unfortunately can't do with virt-io. Will, Any additional comments? Mark, Do you know when you'll have a chance to rebase arm64/smccc-cleanup? Thanks, Ali _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel