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=-4.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,URIBL_SBL,URIBL_SBL_A,USER_AGENT_SANE_1 autolearn=no 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 C0E94C432C3 for ; Thu, 14 Nov 2019 07:45:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 94ADB206DC for ; Thu, 14 Nov 2019 07:45:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=sifive.com header.i=@sifive.com header.b="iuW8cKb+" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726263AbfKNHpM (ORCPT ); Thu, 14 Nov 2019 02:45:12 -0500 Received: from mail-ot1-f66.google.com ([209.85.210.66]:40117 "EHLO mail-ot1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726000AbfKNHpM (ORCPT ); Thu, 14 Nov 2019 02:45:12 -0500 Received: by mail-ot1-f66.google.com with SMTP id m15so4058484otq.7 for ; Wed, 13 Nov 2019 23:45:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; h=date:from:to:cc:subject:in-reply-to:message-id:references :user-agent:mime-version; bh=dKg/k5qQH9spLz57/2miGXOjddJokItWVKvEng4G0Iw=; b=iuW8cKb+IKhbV1bFCx5109eZeJhUncE1UV7wudHbBIKmXPQ4m/SYYe4xVquJZXnvD4 kCBpUfC80OQy6lt8GMe0L6CKRiMwe+NzPgHcoAfJ4z5uYT+sseVEHPlBMR5tTGLPYo2r NZ42Bwjk7h0YfpPsVnVx5f0mBIS0PKJXI0slr3lcdeHC/2DbHUwYBwy9GFuSD9cRm6Qu 4s3OZuqje2pftqEpC+GB2q1YCf9t8LVrHDDNf2/z2GTIBw4hbrMhwlShbjKaPEo9abwt D4Dc4vsNC1mr5jFPBybKEOYliVqn+x59FOTOUdesg6D/YaaOelAFunXV329vnbxOtObJ +1Sg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:in-reply-to:message-id :references:user-agent:mime-version; bh=dKg/k5qQH9spLz57/2miGXOjddJokItWVKvEng4G0Iw=; b=H8JXRaDQk24EJDpfQnmpJRaV9LzoCNLoy0Je44yAf6UZcdgQrIsm+xjNa0ooW3NgD2 sxlmpAtZbNAE9OnJx60yT9YmXu3CVh3ZSINAGNv+kUWNhs3awdf/rOka7Eyk/ACEzn3X JGKGTAYT1244xJBoF2eXp+IYP4KqElGaBlhWXpsXvgCF8IJgeXdIMi8PPx3dJmAkrw0u HZrNnq3KfAbYO4u4uP5VDGztJOvY0SNL7NeQ5RBXoko+NvKyBG6FI4ZXAmW+LMBPv/1o IK0Rp6kpJanevszINKiWAue2r7ue0cfYblxt+aJqrgoccbty4U2StlUB8AfBwkIxRkmK PBUQ== X-Gm-Message-State: APjAAAUbXUnIupAOCZt8xw5vrmBRDNb5CcBsWY7You0ukiFPnLfhelyc uugYduIe/5SrvKs2e88TfSvYsA== X-Google-Smtp-Source: APXvYqzFrDF+lSCTrF1j8O4mTzBCFW8nox2nwrgCgZfzyKd0fGwuQwTQZx3Rhm+flvGA0Ut3R+LK5w== X-Received: by 2002:a9d:1a5:: with SMTP id e34mr6709264ote.105.1573717511403; Wed, 13 Nov 2019 23:45:11 -0800 (PST) Received: from localhost (wsip-98-172-187-222.no.no.cox.net. [98.172.187.222]) by smtp.gmail.com with ESMTPSA id j129sm1579463oib.22.2019.11.13.23.45.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Nov 2019 23:45:10 -0800 (PST) Date: Wed, 13 Nov 2019 23:45:10 -0800 (PST) From: Paul Walmsley X-X-Sender: paulw@viisi.sifive.com To: Christoph Hellwig cc: Palmer Dabbelt , Damien Le Moal , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Anup Patel Subject: Re: [PATCH 09/12] riscv: clear the instruction cache and all registers when booting In-Reply-To: <20191028121043.22934-10-hch@lst.de> Message-ID: References: <20191028121043.22934-1-hch@lst.de> <20191028121043.22934-10-hch@lst.de> User-Agent: Alpine 2.21.9999 (DEB 301 2018-08-15) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 28 Oct 2019, Christoph Hellwig wrote: > When we get booted we want a clear slate without any leaks from previous > supervisors or the firmware. Flush the instruction cache and then clear > all registers to known good values. This is really important for the > upcoming nommu support that runs on M-mode, but can't really harm when > running in S-mode either. Vaguely based on the concepts from opensbi. > > Signed-off-by: Christoph Hellwig > Reviewed-by: Anup Patel Thanks, queued for v5.5-rc1. - Paul