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 3BA0BC54EBC for ; Tue, 10 Jan 2023 17:23:06 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pFHsD-0000IQ-WA; Tue, 10 Jan 2023 11:53:19 -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 1pFHs9-0000H9-Cx for qemu-devel@nongnu.org; Tue, 10 Jan 2023 11:53:14 -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 1pFHs5-00006J-MV for qemu-devel@nongnu.org; Tue, 10 Jan 2023 11:53:12 -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=n6BeLMpRMKgkttz2EDofqSyjzXx2H8C0cnm/1MAQcoY=; b=V0Uy67MAGb20utqVZDXZ9pZLHl xOLSKMOPPhmhzhEa+t6OI+odYDEJbym22/hf7bZ4FQPDcBetijEgnUkqho6lUXZ00OQiwloAB/g5r muRFTyG70uU3bYUwfqnGgY6Ngjv7Oee+BWm5SmN36urXoHJL4ehbznIh6mYmRb6jUfCj/vXagYAJL x8IbhAMvM1DquuBadt4RyFBOUJgdd4ry5OO60WLYAQga3Iszl6E1D4mfjCdGzMcWqVzZNl3nRNF4k Z6yKovrvZMZUhcKMgUNqZydTDSaIG2hBRiNbfEzsbknvI14+wViGTFocBTwKucg40ThHd4Zp/g4cn YO5f+C3g==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pFHs5-003NYo-Mk; Tue, 10 Jan 2023 16:53:09 +0000 Message-ID: <08a790f27c99b15ef9b28bce9139624111aef3bf.camel@infradead.org> Subject: Re: [RFC PATCH v1 00/15] Xen PV backend support for KVM/Xen guests From: David Woodhouse To: Joao Martins Cc: Paolo Bonzini , Paul Durrant , Ankur Arora , Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Thomas Huth , Alex =?ISO-8859-1?Q?Benn=E9e?= , Juan Quintela , "Dr . David Alan Gilbert" , Claudio Fontana , Julien Grall , qemu-devel@nongnu.org Date: Tue, 10 Jan 2023 16:52:56 +0000 In-Reply-To: References: <20230110122042.1562155-1-dwmw2@infradead.org> <20230110123754.1564465-1-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Y1P0lK4GuIvYJSCDL/6u" 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+b726f73bd8c89da575c8+7079+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 --=-Y1P0lK4GuIvYJSCDL/6u Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-01-10 at 15:43 +0000, Joao Martins wrote: > On 10/01/2023 12:37, David Woodhouse wrote: > > Some parts of it are relatively straightforward; others less so. In > > particular, it looks really hard to provide a contiguous virtual mappin= g > > of multiple potentially discontiguous pages granted by the guest. To > > fix that we might actually need the guest memory blocks to be backed > > by real files (perhaps deleted or shmem) in order that they can be mapp= ed > > again in at a different virtual address.=20 >=20 > I wonder if we really need to go to that extent. >=20 > As far as Qemu emulated-Xen is concerned, gref is mostly a different look= up > mechanism a GPA i.e. an index on a table (that the VMM knows about) that > references a GPA. Perhaps if it's simpler to teach the backends to deal w= ith > discontiguous grefs (if there's such a case today even). We thought about making the back ends deal with discontiguous grefs by returning an array[nr_refs] of pointers to each one. The problem is that in some cases the ring entries don't even land on page boundaries, leaving one entry crossing from one page to the next. For example the 32-bit blkif response is 12 bytes, which means it lines up at the end of the *first* page (64-byte ring header + 336 @12 byte entries =3D=3D 4096) but it won't line up at the end of the *second* page. Which is still not insurmountable, but it's kind of awful. > The only user of multi-gref mapping is the block xen driver ... and only = for > mapping the shared ring if I understood correctly. But even there you cou= ld > probably twist it... considering that the multi-gref ring is contiguous i= s guest > address space, thus the gref -> HVA conversion ius contiguous too (?). So= that > way you could still return a single HVA (provided that map-grant implemen= tation > validates the backing frame contiguosity). There's no reason a guest couldn't vmalloc its multi-page ring and have a virtually contiguous view for itself, while the actual GPAs are discontiguous. Sure, that's probably not the common case, but I didn't really want to have a multi-page mapping succeed *sometimes*. > > So for now we'll limit the > > back ends to mapping a single grant ref at a time. > > Which is not a practical limitation right now. That sentence can be read both ways. I first read it as "that limitation is impractical". But prefer to read it as "that doesn't limit us in practice", and I *think* the latter is what you meant from the rest of the paragraph... > One grant ref is actually fine > for the everything else that is not the block shared-ring.=C2=A0 Xen devi= ces in Qemu > seem to be using the legacy backend interface, and thus (un)mapping one g= rant at > a time, or otherwise copying grefs. Right. We can absolutely live with that limitation for now; we'll teach xen-block not to advertise a higher max-ring-page-order if ring_order if the MAP_MULTIPLE feature isn't set. And I absolutely don't give a crap about 9p or usb just yet. :) > > https://git.infradead.org/users/dwmw2/qemu.git/shortlog/refs/heads/xenf= v-kvm-backends-1 > >=20 > Cool stuff! A lot better than the RFC redirection layer >=20 > > David Woodhouse (14): > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 hw/xen: Remove old version of Xen header= s >=20 > This patch looks more appropriate to your earlier v6 (?) I would have liked that but it depends on a bit on the header untangling that happens in between. As we introduce the backend ops structures, rename xen_common.h =E2=86=92 xen_native.h and remove that from= the C files that don't need it, we subtly fix things such that this final patch removing the old headers makes it *look* easy.=20 --=-Y1P0lK4GuIvYJSCDL/6u Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 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