From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, T_DKIMWL_WL_HIGH,URIBL_BLOCKED,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 028EBC28CC5 for ; Wed, 5 Jun 2019 12:20:46 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id CAE47206BA for ; Wed, 5 Jun 2019 12:20:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="gHvLmC7q" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CAE47206BA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hJ5kI5J65yOu+vQqlToUL+iyY63/aQ0ZpgoPDHpW2IM=; b=gHvLmC7qoBEqNl gg9QJmHSKulUcR/s7q1fDeipqK9JkZc4zC0ScO+iiyJAyQBgZhN9QfqHUzOuYlNuwM1PWTGeb7KeO 0wrRFvUGqEzkR98403QmqMDLshCP+z65/S6eo+NmxIo0gd+ueqEh4fKPEE+x7ANajwQTMjnAZI+RO UXlF/FZ5fj+Uuhc3uKLAXRGrr0lmHDyyo1LJ3kOPqWxYKSceqPt8VqZK+9no2CH1o2+z8/6P2vUOo 2r8tc55MwoLUHET5QVz821AyylFIPoIGe6hn4DAm0tOtYgkqoOvrd0YD1+lygJpXjO2uv01OsK8jR lijwJLBzfw0sIcVJqBKQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hYUuF-0007y4-KN; Wed, 05 Jun 2019 12:20:39 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hYUuC-0007wY-3Q for linux-arm-kernel@lists.infradead.org; Wed, 05 Jun 2019 12:20:37 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8788E80D; Wed, 5 Jun 2019 05:20:35 -0700 (PDT) Received: from fuggles.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.72.51.249]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 732363F246; Wed, 5 Jun 2019 05:20:33 -0700 (PDT) Date: Wed, 5 Jun 2019 13:20:31 +0100 From: Will Deacon To: Ali Saidi Subject: Re: [PATCH 0/3] Add support for Graviton TRNG Message-ID: <20190605122031.GK15030@fuggles.cambridge.arm.com> References: <20190604203100.15050-1-alisaidi@amazon.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20190604203100.15050-1-alisaidi@amazon.com> User-Agent: Mutt/1.11.1+86 (6f28e57d73f2) () X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190605_052036_142837_1DC2BC92 X-CRM114-Status: GOOD ( 10.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Benjamin Herrenschmidt , Herbert Xu , Arnd Bergmann , Greg Kroah-Hartman , Catalin Marinas , linux-kernel@vger.kernel.org, Ron Rindjunsky , linux-crypto@vger.kernel.org, Matt Mackall , David Woodhouse , linux-arm-kernel@lists.infradead.org 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 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? Will _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel