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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A2F3C433F5 for ; Wed, 23 Mar 2022 21:07:21 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 095836B0072; Wed, 23 Mar 2022 17:07:21 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0450D6B0073; Wed, 23 Mar 2022 17:07:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E4F496B0074; Wed, 23 Mar 2022 17:07:20 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.28]) by kanga.kvack.org (Postfix) with ESMTP id D72686B0072 for ; Wed, 23 Mar 2022 17:07:20 -0400 (EDT) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay12.hostedemail.com (Postfix) with ESMTP id AB97E1209D2 for ; Wed, 23 Mar 2022 21:07:20 +0000 (UTC) X-FDA: 79276886640.10.71B8143 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf17.hostedemail.com (Postfix) with ESMTP id F2E794002C for ; Wed, 23 Mar 2022 21:07:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=6Op/HW7FahWIa5b2pzltH3d7JbhxTR87IMPNy0kIjzw=; b=QDoM+9poGmPAZ1FaZX88O+1PVi zk+uv36rDHRvGx99WvtWvIBechJyI8ZNdBDD7xPlmFqcBH/VYHnZC6TGxf5aSrgaLpCqybWN6TUcX C2mkKTbTR8gYTd/r+WOzP2ftxi7ClKObbdj4Bk8ySpHdxUkT6QrYSDqLYw0wSwxRhR7C+ck1/5puf 9hnONzfGJrVDtIBthpBBJm9gzVqvZZx2C4Z+8IHpHJ39giWaPh8CEoruzoLddOWdEqrch7Klo9n7u HqQPRMQEtrnlWfmalFlVIOD3mgMJXKuQUvT5H0bIsWGcxlvbfRUekTO5IeECBZc+f86+iprJ5Ux6u ip2svXVw==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1nX8C4-00CqUV-06; Wed, 23 Mar 2022 21:07:00 +0000 Date: Wed, 23 Mar 2022 21:06:59 +0000 From: Matthew Wilcox To: Junaid Shahid Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, pbonzini@redhat.com, jmattson@google.com, pjt@google.com, oweisse@google.com, alexandre.chartre@oracle.com, rppt@linux.ibm.com, dave.hansen@linux.intel.com, peterz@infradead.org, tglx@linutronix.de, luto@kernel.org, linux-mm@kvack.org Subject: Re: [RFC PATCH 10/47] mm: asi: Support for global non-sensitive direct map allocations Message-ID: References: <20220223052223.1202152-1-junaids@google.com> <20220223052223.1202152-11-junaids@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220223052223.1202152-11-junaids@google.com> X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: ikin548psogc3tepsoying8s5pqo14h7 Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=QDoM+9po; dmarc=none; spf=none (imf17.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org X-Rspamd-Queue-Id: F2E794002C X-HE-Tag: 1648069639-897304 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Feb 22, 2022 at 09:21:46PM -0800, Junaid Shahid wrote: > standard ASI instances. A new page flag is also added so that when > these pages are freed, they can also be unmapped from the ASI page > tables. It's cute how you just throw this in as an aside. Page flags are in high demand and just adding them is not to be done lightly. Is there any other way of accomplishing what you want? > @@ -542,6 +545,12 @@ TESTCLEARFLAG(Young, young, PF_ANY) > PAGEFLAG(Idle, idle, PF_ANY) > #endif > > +#ifdef CONFIG_ADDRESS_SPACE_ISOLATION > +__PAGEFLAG(GlobalNonSensitive, global_nonsensitive, PF_ANY); Why is PF_ANY appropriate?