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 7DC91C33CA1 for ; Wed, 5 Feb 2020 10:32:53 +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 432BD2082E for ; Wed, 5 Feb 2020 10:32:53 +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="GQg/fBUa" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 432BD2082E 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 1izHyz-00068a-67; Wed, 05 Feb 2020 10:32:33 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1izHyx-00068T-EA for xen-devel@lists.xenproject.org; Wed, 05 Feb 2020 10:32:31 +0000 X-Inumbo-ID: cffb9392-4802-11ea-b211-bc764e2007e4 Received: from bombadil.infradead.org (unknown [2607:7c80:54:e::133]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id cffb9392-4802-11ea-b211-bc764e2007e4; Wed, 05 Feb 2020 10:32:30 +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=Tp02GQl+sgJOz2CgqRYLr+A6pxYK1VqcaDp7CYhY0RA=; b=GQg/fBUaRcgeH9ZyFfHva8A+7A xtGiU8hYly+ApFiKKyhuIlQpjl6reVKcQNt2QmzLL/IY/Ebjy2TwMGWtK7dzBNxMHM+ABZI6tJ3Vy J+LdloNBr7z0f6iW/O4V8CMa161pjdkAJbpes4ieTv7JULdRWkkFwTciJTTxD+8jUYaaUm5C02M8F Ck+asKdZ04+Y83Kh/9VvL49Wkqcm5j7LuGycUtvXfejGdGmk/CqzW0wOqQZIPvnASQWNlZs4yy50i OmBCO7+wiaUcZ8cnbjbuCau2bLpF5TM+uflrNGr6CwydZDCIeo87TKJgnAz1YUnmLbExqCYjFrVRc uWSZvRwg==; Received: from 54-240-197-235.amazon.com ([54.240.197.235] helo=u3832b3a9db3152.ant.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1izHyl-00038U-UJ; Wed, 05 Feb 2020 10:32:21 +0000 Message-ID: <8ffc0ff9891df05a9751c728b6c325d8ec46d125.camel@infradead.org> From: David Woodhouse To: Julien Grall , George Dunlap , Jan Beulich , Stewart Hildebrand Date: Wed, 05 Feb 2020 10:32:15 +0000 In-Reply-To: <9d1c6e2b-f155-96f9-deeb-1b1f30c94081@xen.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> <9d1c6e2b-f155-96f9-deeb-1b1f30c94081@xen.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 , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Jeff Kubascik , xen-devel@lists.xenproject.org Content-Type: multipart/mixed; boundary="===============3045583617267404529==" Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" --===============3045583617267404529== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-vVRTUrhlNgaB2PzeCoBY" --=-vVRTUrhlNgaB2PzeCoBY Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2020-02-05 at 10:22 +0000, Julien Grall wrote: > Hi, >=20 > On 05/02/2020 09:50, David Woodhouse wrote: > > On Tue, 2020-02-04 at 15:37 +0000, George Dunlap wrote: > > > At very least it's more robust this way; the algorithm is also less > > > "magic". We just had a long discussion this morning trying to re-cre= ate > > > the logic for why "Remove MFN 0" was sufficient to prevent this issue= , > > > and even then David wasn't sure it was correct at first. > >=20 > > Right. So the real reason I'm staring hard at this is because I can't > > convince myself there aren't places where memory allocated by the boot > > allocator is later freed with free_xenheap_pages(). > >=20 > > We have a few pieces of code which decide whether to use the boot > > allocator vs. heap based on system_state >=3D SYS_STATE_boot, and *if* > > the rule is "thou shalt not allocate with boot allocator and free > > later" then it's *extremely* fragile and probably being violated =E2=80= =94 > > especially because it actually *works* most of the time, except in some > > esoteric corner cases like MFN#0, boot allocations which cross > > zones/regions, etc. > >=20 > > So because we want to make that *more* likely by allowing vmap() to > > happen earlier, I'd like to clean things up by addressing those corner > > cases and making it unconditionally OK to free boot-allocated pages > > into the heap. > >=20 > > I think might be as simple as checking for (first_pg)->count_info =3D= =3D 0 > > in free_xenheap_pages(). That's quick enough, and if the count_info is > > zero then I think it does indicate a boot-allocated page, because pages > > from alloc_xenheap_pages() would have PGC_xen_heap set? > >=20 > > It would suffice just to pass such pages to init_heap_pages() instead > > of directly to free_heap_pages(), I think. Julien? > >=20 > > The straw man version of that looks a bit like this... > >=20 > > --- a/xen/common/page_alloc.c > > +++ b/xen/common/page_alloc.c > > @@ -2304,6 +2304,12 @@ void free_xenheap_pages(void *v, unsigned int or= der) > > =20 > > pg =3D virt_to_page(v); > > =20 > > + /* Pages from the boot allocator need to pass through init_heap_pa= ges() */ > > + if ( unlikely(!pg->count_info) ) >=20 > Note that there is two versions of free_xenheap_pages(). This one only= =20 > cover the case where the domheap and xenheap are the same. >=20 > But you can't use the same trick when xenheap is separated (like on=20 > Arm32) because PGC_xen_heap is not set. So you would be calling=20 > init_heap_pages() everytime. Right. We'd want to set PGC_xen_heap there too on the corresponding pages. > However, I don't like the idea of relying on count_info =3D=3D 0. Indeed,= =20 > there are valid case where count_info =3D=3D 0 because it means the page = is=20 > inuse (PCC_state_inuse). For xenheap pages, not just domheap pages? > It might be best if we introduce a new page state that would be the=20 > default value set in the frametable. ... and which is easily set with memset() so it's fast, which I think you considered since you were suggesting all 0xFF, but which we haven't explciitly stated out loud. The other thing to note is that it's easy to make a default state for pages which *weren't* given out by the boot allocator, but we don't have a simple way to do anything to the pages which *were* given out by the boot allocator, since we don't track those and =E2=80=94 fairly much by definition =E2=80=94 we don't have the frametable yet when we start the boo= t allocator. --=-vVRTUrhlNgaB2PzeCoBY Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 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