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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 907B4C4332B for ; Mon, 23 Mar 2020 10:46:18 +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 5886620722 for ; Mon, 23 Mar 2020 10:46:18 +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="dl3eTCb6" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5886620722 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass 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 1jGKaU-0002SI-8U; Mon, 23 Mar 2020 10:45:42 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1jGKaS-0002SD-Rb for xen-devel@lists.xenproject.org; Mon, 23 Mar 2020 10:45:41 +0000 X-Inumbo-ID: 67cc34fa-6cf3-11ea-bec1-bc764e2007e4 Received: from bombadil.infradead.org (unknown [2607:7c80:54:e::133]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 67cc34fa-6cf3-11ea-bec1-bc764e2007e4; Mon, 23 Mar 2020 10:45:26 +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=q3sTt3e9FkHDlUYHG7F7CSD/CDrGcb0Sy5GTnon/Nu0=; b=dl3eTCb6CV/SACYuYF6tbXNxHQ qcYXjv2xBj8yNkZCtR9zTQ3xC7pcv+iyBtVVzlZAFe9x35cXnr1tNirXhBOfp+/yTQabfIb4rgO8O ASKfAZp4c1rE4N9SeF7IigySDmELnZz0hKjbKTVjoKQuVAH3ye7C7Waq4rXts2wJDZiDAyh4RnCeB ySoj+kBIR0Kt5oPv8W4VGpT5R8oemlCr9yqS0um1MeXVjT16BVcSeKxnsemd/GY35MNjt8pf0i8al f+T3LZ0BCnceiVuB3kUBHNFcMn3jy3jctquMePQNQZ5lgSBQSMAhwOm0ASP1lGUC2maTn/h52KuNA VFq4WP0Q==; Received: from 54-240-197-232.amazon.com ([54.240.197.232] helo=u3832b3a9db3152.ant.amazon.com) by bombadil.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jGKaC-0006kE-Q5; Mon, 23 Mar 2020 10:45:25 +0000 Message-ID: <1db9715c162980dd2160341223df83ee803f1406.camel@infradead.org> From: David Woodhouse To: paul@xen.org, xen-devel@lists.xenproject.org Date: Mon, 23 Mar 2020 10:45:21 +0000 In-Reply-To: <002c01d600ef$f4832ef0$dd898cd0$@xen.org> References: <759b48cc361af1136e3cf1658f3dcb1d2937db9c.camel@infradead.org> <20200319212150.2651419-1-dwmw2@infradead.org> <20200319212150.2651419-2-dwmw2@infradead.org> <004701d5febc$3632bfe0$a2983fa0$@xen.org> <45c147a12565cb1b0ca34217a8d66289a91ec35c.camel@infradead.org> <002c01d600ef$f4832ef0$dd898cd0$@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] [PATCH 2/2] xen/mm: Introduce PGC_state_uninitialised 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' , 'Andrew Cooper' , 'Ian Jackson' , 'George Dunlap' , hongyxia@amazon.com, 'Jan Beulich' , 'Volodymyr Babchuk' , 'Roger Pau =?ISO-8859-1?Q?Monn=E9=27?= Content-Type: multipart/mixed; boundary="===============8374906981462889932==" Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" --===============8374906981462889932== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-AfL9J+gBkeJaQnwFZ4Kt" --=-AfL9J+gBkeJaQnwFZ4Kt Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2020-03-23 at 08:49 +0000, Paul Durrant wrote: > Ok, so deferring the call to free_heap_pages() (and consequently > init_heap_pages()) is safe to defer until the guest is torn down? (Or > is this only safe if the page is being assigned to the initial > domain?) It's intended to be safe in all cases, including pages which are allocated from the boot allocator to be used as page tables (cf. the early-vmap patches), etc. We kind of have to assume that it's safe to use the page for whatever purpose it was allocated for, for the lifetime of that usage. If *that* isn't true, we have bigger problems. The PGC_state_uninitialised thing is only about recycling it into the heap *later*, once the lifetime of that initial usage has ended. --=-AfL9J+gBkeJaQnwFZ4Kt Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCECow ggUcMIIEBKADAgECAhEA4rtJSHkq7AnpxKUY8ZlYZjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTkwMTAyMDAwMDAwWhcNMjIwMTAxMjM1 OTU5WjAkMSIwIAYJKoZIhvcNAQkBFhNkd213MkBpbmZyYWRlYWQub3JnMIIBIjANBgkqhkiG9w0B AQEFAAOCAQ8AMIIBCgKCAQEAsv3wObLTCbUA7GJqKj9vHGf+Fa+tpkO+ZRVve9EpNsMsfXhvFpb8 RgL8vD+L133wK6csYoDU7zKiAo92FMUWaY1Hy6HqvVr9oevfTV3xhB5rQO1RHJoAfkvhy+wpjo7Q 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