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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 30325C04AAC for ; Tue, 21 May 2019 01:43:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0AEE02171F for ; Tue, 21 May 2019 01:43:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727561AbfEUBnk (ORCPT ); Mon, 20 May 2019 21:43:40 -0400 Received: from shards.monkeyblade.net ([23.128.96.9]:60738 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727108AbfEUBnj (ORCPT ); Mon, 20 May 2019 21:43:39 -0400 Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::3d8]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id AC23214249739; Mon, 20 May 2019 18:43:38 -0700 (PDT) Date: Mon, 20 May 2019 18:43:36 -0700 (PDT) Message-Id: <20190520.184336.743103388474716249.davem@davemloft.net> To: rick.p.edgecombe@intel.com Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, linux-mm@kvack.org, mroos@linux.ee, mingo@redhat.com, namit@vmware.com, luto@kernel.org, bp@alien8.de, netdev@vger.kernel.org, dave.hansen@intel.com, sparclinux@vger.kernel.org Subject: Re: [PATCH v2] vmalloc: Fix issues with flush flag From: David Miller In-Reply-To: References: <3e7e674c1fe094cd8dbe0c8933db18be1a37d76d.camel@intel.com> <20190520.203320.621504228022195532.davem@davemloft.net> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Mon, 20 May 2019 18:43:39 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Edgecombe, Rick P" Date: Tue, 21 May 2019 01:20:33 +0000 > Should it handle executing an unmapped page gracefully? Because this > change is causing that to happen much earlier. If something was relying > on a cached translation to execute something it could find the mapping > disappear. Does this work by not mapping any kernel mappings at the beginning, and then filling in the BPF mappings in response to faults? From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Date: Tue, 21 May 2019 01:43:36 +0000 Subject: Re: [PATCH v2] vmalloc: Fix issues with flush flag Message-Id: <20190520.184336.743103388474716249.davem@davemloft.net> List-Id: References: <3e7e674c1fe094cd8dbe0c8933db18be1a37d76d.camel@intel.com> <20190520.203320.621504228022195532.davem@davemloft.net> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: rick.p.edgecombe@intel.com Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, linux-mm@kvack.org, mroos@linux.ee, mingo@redhat.com, namit@vmware.com, luto@kernel.org, bp@alien8.de, netdev@vger.kernel.org, dave.hansen@intel.com, sparclinux@vger.kernel.org From: "Edgecombe, Rick P" Date: Tue, 21 May 2019 01:20:33 +0000 > Should it handle executing an unmapped page gracefully? Because this > change is causing that to happen much earlier. If something was relying > on a cached translation to execute something it could find the mapping > disappear. Does this work by not mapping any kernel mappings at the beginning, and then filling in the BPF mappings in response to faults?