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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_2 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 5FF95C04EB5 for ; Fri, 7 Feb 2020 15:50:26 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 2D9EE20720 for ; Fri, 7 Feb 2020 15:50:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="GM29PeAf" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2D9EE20720 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1j05t6-0001ox-3Z; Fri, 07 Feb 2020 15:49:48 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1j05t4-0001or-2u for xen-devel@lists.xenproject.org; Fri, 07 Feb 2020 15:49:46 +0000 X-Inumbo-ID: 6fd4a7f4-49c1-11ea-a677-bc764e2007e4 Received: from bombadil.infradead.org (unknown [2607:7c80:54:e::133]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 6fd4a7f4-49c1-11ea-a677-bc764e2007e4; Fri, 07 Feb 2020 15:49:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=h3BK3Bgh6bHRAUJim4BehdEdiV6OO5LaEs8HCrpB0Ko=; b=GM29PeAfdMFvRlv8Ej3qxVbWqr 1lidmQeszXs7wAgxkPQV7a9q+0QQ0MooVLAKkKacfhtn46sck3X2Vqia8B+tCad+XIkQvcEwleqS/ I0q1MP9XpO3GiC2errDYDRFjtl6k9ihl9EM9jBWGrfD163oCUXiYtX0EupoRtwQzokCrjvDhtKMxR oriszsnHBmXJZxi4S6w77LOX/dSp3CeHioJIGQX4f9TYO5NL+tyCHh0qF3OQX1LNFRHmNSZmN97vP YzK0/yp1DwQNyi7Rz2QQIggBSGk300TUiPRdiC0pEBkhKg1cDBBtaEq9LV7iIH8fUJZOCpHxUH3PR OKrQYqQQ==; Received: from 54-240-197-225.amazon.com ([54.240.197.225] helo=freeip.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1j05si-0008VW-7s; Fri, 07 Feb 2020 15:49:24 +0000 Message-ID: <56f7fe21daff2dc4bf8db7ee356666233bdb0f7a.camel@infradead.org> From: David Woodhouse To: Jan Beulich Date: Fri, 07 Feb 2020 15:49:19 +0000 In-Reply-To: <35f374ade4ae914b086e3335bc76fbe2.squirrel@twosheds.infradead.org> References: <20200204151441.10626-1-stewart.hildebrand@dornerworks.com> <89f9cdc5-bd93-7c15-7832-740db273aca6@suse.com> <428eb589-ec3d-1527-02ce-92e2d4367a1a@citrix.com> <81c41a686f6a520936342f04b62d7c27c137f57e.camel@infradead.org> <59013bb7dbf9b79daa6dd280c4448418aa1fc56b.camel@infradead.org> <00ee9b49-2a95-9305-846a-b395e37b8728@suse.com> <35f374ade4ae914b086e3335bc76fbe2.squirrel@twosheds.infradead.org> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.1 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Subject: Re: [Xen-devel] [XEN PATCH v2 1/2] Check zone before merging adjacent blocks in heap X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Julien Grall , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , George Dunlap , Jeff Kubascik , Stewart Hildebrand , xen-devel@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============7304069667199649274==" Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" --===============7304069667199649274== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-6MoC7vCA3q2+XNscxtc5" --=-6MoC7vCA3q2+XNscxtc5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2020-02-05 at 14:12 +0000, David Woodhouse wrote: > I think we have a viable path to fixing that, by folding PGC_broken in to > the state bits so that we can disambiguate. Will experiment. Here, it looks something like this. First we fold PGC_broken into the state bits giving us 8 possible states of which only 6 are currently in use. Then in the second patch we can move PGC_state_inuse from zero (the default contents of the frame table at startup), and make a new state PGC_state_uninitialised with the value zero. We can make free_xenheap_pages() and free_domheap_pages() call init_heap_pages() instead of free_heap_pages() if they see a page range which is still in PGC_state_uninitialised. We need to fix up a couple of asserts not only to cope with PGC_state_inuse not being zero (as Julien has already looked at) but also to take PGC_state_uninitialised pages. In assign_pages() that's because we map the multiboot module containing the initramfs to dom0. That might actually cross node boundaries, contain MFN#0, etc. =E2=80=94 so if/when that gets released by dom0 we'd wa= nt those pages to be passed to init_heap_pages() just the same as boot- allocated memory. In share_xen_page_with_guest() it happens because we share all non-RAM page frames with dom0. 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