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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3289AC636D6 for ; Thu, 16 Feb 2023 13:51:34 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pSefM-000693-MF; Thu, 16 Feb 2023 08:51:16 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pSefK-00068d-81 for qemu-devel@nongnu.org; Thu, 16 Feb 2023 08:51:14 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pSefF-00045o-Iw for qemu-devel@nongnu.org; Thu, 16 Feb 2023 08:51:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=dXLT8PdRP6Y2QdYg2BpjDX7pEyQVz2oWqmlp1b5rAlw=; b=unEdYa0tPLTirprTkR6wy2oLEQ puEg4NMhn4IDvDvsdp0btE7Xp1QRrbWGnrEGupJy8hPZExn44HLIPFGlnLCM1TJcVAJ+EWDWN1IQ5 gu+DP+2qorVY6yGDBT4f1TJiAINOo+t++AsKBOs/NTvh3vWBvLQwrud0p/H8iIajTUKKxCbqdxD1v dGObjmuSdXP10D53UR0zQpq5+lJOBxuouma2PdTB/fJbXxNfEva0/Vi+Qw98XVCwvJLQooqsJURcF HfXN+c1BgReh1AF/JJqzybSGmWAE0CiFKNM+GCIoy9GsJ0TsAh9mUH+7YUY3bZ+AC/urdo9luFFvW R7pz7n6A==; Received: from [2001:871:43:561d:25d2:1b3e:6f19:aa40] (helo=dynamic-pd01.res.v6.highway.a1.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pSef9-008SQW-MG; Thu, 16 Feb 2023 13:51:04 +0000 Message-ID: Subject: Re: [RFC PATCH v11bis 00/26] Emulated XenStore and PV backend support From: David Woodhouse To: quintela@redhat.com Cc: Peter Maydell , qemu-devel@nongnu.org, Paolo Bonzini , Paul Durrant , Joao Martins , Ankur Arora , Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Thomas Huth , Alex =?ISO-8859-1?Q?Benn=E9e?= , "Dr . David Alan Gilbert" , Claudio Fontana , Julien Grall , "Michael S. Tsirkin" , Marcel Apfelbaum , armbru@redhat.com, Stefano Stabellini , vikram.garhwal@amd.com Date: Thu, 16 Feb 2023 14:51:01 +0100 In-Reply-To: <87sff5khqo.fsf@secure.mitica> References: <20230216094436.2144978-1-dwmw2@infradead.org> <87sff5khqo.fsf@secure.mitica> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-jDk4SYxkcOAZoZa6DCVr" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+33d3adc5578b079b0cf9+7116+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-jDk4SYxkcOAZoZa6DCVr Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-02-16 at 11:49 +0100, Juan Quintela wrote: > David Woodhouse wrote: > > The non-RFC patch submisson=C2=B9 is just the basic platform support fo= r Xen > > on KVM. This RFC series is phase 2, adding an internal XenStore and > > hooking up the PV back end drivers to that and the emulated grant table= s > > and event channels. > >=20 > > With this, we can boot a Xen guest with PV disk, under KVM. Full suppor= t > > for migration isn't there yet because it's actually missing in the PV > > back end drivers in the first place (perhaps because upstream Xen doesn= 't > > yet have guest transparent live migration support anyway). I'm assuming > > that when the first round is merged and we drop the [RFC] from this set= , > > that won't be a showstopper for now? > >=20 > > I'd be particularly interested in opinions on the way I implemented > > serialization for the XenStore, by creating a GByteArray and then dumpi= ng > > it with VMSTATE_VARRAY_UINT32_ALLOC(). >=20 > And I was wondering why I was CC'd in the whole series O:-) >=20 Indeed, Philippe M-D added you to Cc when discussing migrations on the first RFC submission back in December, and you've been included ever since. > How big is the xenstore? > I mean typical size and maximun size. >=20 Booting a simple instance with a single disk: $ scripts/analyze-migration.py -f foo | grep impl_state_size "impl_state_size": "0x00000634", Theoretical maximum is about 1000 nodes @2KiB, so around 2MiB. > If it is suficientely small (i.e. in the single unit megabytes), you can > send it as a normal device at the end of migration. >=20 Right now it's part of the xen_xenstore device. Most of that is fairly simple and it's just the impl_state that's slightly different. > If it is bigger, I think that you are going to have to enter Migration > iteration stage, and have some kind of dirty bitmap to know what entries > are on the target and what not. >=20 We have COW and transactions; that isn't an impossibility; I think we can avoid that complexity though. --=-jDk4SYxkcOAZoZa6DCVr Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG 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