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 A398DC07545 for ; Wed, 25 Oct 2023 19:03:37 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qvj9d-00023t-RM; Wed, 25 Oct 2023 15:02:59 -0400 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 1qvj9S-00022z-7P; Wed, 25 Oct 2023 15:02:46 -0400 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 1qvj9O-0006Yr-7Z; Wed, 25 Oct 2023 15:02:45 -0400 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=RNbldFeH9RXvhlMpBkxoU3qDnF569sj7HrRIMA2FfyY=; b=GOLQM5YAVN8ONSWs9Bl6R+Z4Ah yK2FLDGqcaIZ6VnC7cGLY2E2nuNoBWTMLBYZvI3yOPlp/rc+1Zy8aI4k7z/s+KCbHEKWQ8O/EtvPf iCSB/q8wsmSh7Apb+xVZTET359Eib0ftTLVGDZ9RSeyexHId2vBbICP0edzIsKysw6GZ1EEnYgIqd PwnYZiTJdXoU2rhxIIfLWxzZdYFQCZH+2amLL63+0a2NveAd/KbE39TGA7cGoQlbn71ESHSU7ljeY COiALHuWH6uOWxhU1mb0wHFa4opjQzbB09HWKb02vFvmZ7WPRzm4dn6dHy9rgTlRjUcB+94vMnWh3 9mCXC32A==; Received: from [2001:8b0:10b:5:5bd0:63a6:23b2:1881] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qvj9E-00AT4n-7V; Wed, 25 Oct 2023 19:02:32 +0000 Message-ID: <0f7a176064f2b351576ab5d31a3a8e921cca4212.camel@infradead.org> Subject: Re: [PATCH v3 28/28] docs: update Xen-on-KVM documentation From: David Woodhouse To: Andrew Cooper , Eric Blake Cc: qemu-devel@nongnu.org, Kevin Wolf , Hanna Reitz , Stefano Stabellini , Anthony Perard , Paul Durrant , =?ISO-8859-1?Q?Marc-Andr=E9?= Lureau , Paolo Bonzini , "Michael S. Tsirkin" , Marcel Apfelbaum , Richard Henderson , Eduardo Habkost , Jason Wang , Marcelo Tosatti , qemu-block@nongnu.org, xen-devel@lists.xenproject.org, kvm@vger.kernel.org, Bernhard Beschow , Joel Upham Date: Wed, 25 Oct 2023 20:02:31 +0100 In-Reply-To: <21e8a265-bf5a-464c-86bc-f0fd7b5eb108@citrix.com> References: <20231025145042.627381-1-dwmw2@infradead.org> <20231025145042.627381-29-dwmw2@infradead.org> <6vbpkrebc7fpypbv2t7jbs7m3suxwbqqykeomzfxpenjj2sogd@rphcppcl4inl> <4a10a50e5469480a82cb993dedbff10c3d777082.camel@infradead.org> <21e8a265-bf5a-464c-86bc-f0fd7b5eb108@citrix.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Fy7YuKjiqJwaUXFo/l80" User-Agent: Evolution 3.44.4-0ubuntu2 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+85b1c44ac99574f3713d+7367+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 --=-Fy7YuKjiqJwaUXFo/l80 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2023-10-25 at 19:56 +0100, Andrew Cooper wrote: > On 25/10/2023 7:26 pm, David Woodhouse wrote: > =C2=A0 > > On Wed, 2023-10-25 at 13:20 -0500, Eric Blake wrote: > > =C2=A0 > > > On Wed, Oct 25, 2023 at 03:50:42PM +0100, David Woodhouse wrote: > > =C2=A0 > > > =C2=A0 > > > > + > > > > +Booting Xen PV guests > > > > +--------------------- > > > > + > > > > +Booting PV guest kernels is possible by using the Xen PV shim (a v= ersion of Xen > > > > +itself, designed to run inside a Xen HVM guest and provide memory = management > > > > +services for one guest alone). > > > > + > > > > +The Xen binary is provided as the ``-kernel`` and the guest kernel= itself (or > > > > +PV Grub image) as the ``-initrd`` image, which actually just means= the first > > > > +multiboot "module". For example: > > > > + > > > > +.. parsed-literal:: > > > > + > > > > +=C2=A0 |qemu_system| --accel kvm,xen-version=3D0x40011,kernel-irqc= hip=3Dsplit \\ > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -chardev stdio,id=3Dchar0 -de= vice xen-console,chardev=3Dchar0 \\ > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -display none=C2=A0 -m 1G=C2= =A0 -kernel xen -initrd bzImage \\ > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -append "pv-shim console=3Dxe= n,pv -- console=3Dhvc0 root=3D/dev/xvda1" \\ > > > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -drive file=3D${GUEST_IMAGE},= if=3Dxen > > > Is the space between -- and console=3D intentionsl? > > Yes, that one is correct. The -- is how you separate Xen's command line > > (on the left) from the guest kernel command line (on the right). > =C2=A0 > =C2=A0To expand on this a bit. > =C2=A0 > =C2=A0Multiboot1 supports multiple modules but only a single command > line.=C2=A0 As one of the modules passed to Xen is the dom0 kernel, we > need some way to pass it's command line, hence the " -- ". > =C2=A0 > =C2=A0Multiboot2 and PVH support a command line per module, which is the > preferred way to pass the commandlines, given a choice. > =C2=A0 Thanks. Indeed, I had *originally* thought I was going to need to implement Multiboot2 in qemu in order to boot Shim + PV guest, but it turns out we can make it work with just Multiboot1 support. As long as the guest kernel doesn't want an *actual* initrd, that is ;) --=-Fy7YuKjiqJwaUXFo/l80 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 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf 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