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 E37C9C678D5 for ; Tue, 7 Mar 2023 16:23:00 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pZa5W-000353-GY; Tue, 07 Mar 2023 11:22:54 -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 1pZa5U-00033G-Da for qemu-devel@nongnu.org; Tue, 07 Mar 2023 11:22:52 -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 1pZa5S-0007Ls-KM for qemu-devel@nongnu.org; Tue, 07 Mar 2023 11:22:52 -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=nNhyhMhwfXBKddqL0/8UN9Xo0T2a9NXo9/sjONe8BOk=; b=thidL2pmJz3CPwZNpsw2A/39vX nuzNNcWhl2EV/b8yasNrtUlJLkdb0o1wrf8/c3a+3qSmY8jf3+qD8sfCNnXFAgYZOU6+7MP5WEUAl IDVOo+3839P0hFOi//7y/oNSAR42KpkUyej39+4iD0d6cGbOQ7y3UuS4pa6W/z0uyWPDhJfAvOSRp FigLqDsM3HhC54qRAhD5Tds0KfcEYwabPnialtxNISyfExZeNYvoZE3RpcAvESds+uud8rUTdKdYk DwAL+ZzLqT4qyhxS3L34es/tYyk+XjtEylHMcGIHDblFlg26DOgNKMBGzWHZSe3WFEKI7d8GWLCVI XFq9X8kg==; Received: from [2001:8b0:10b:5:640c:634b:db90:9c87] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pZa5Q-006YZ0-3p; Tue, 07 Mar 2023 16:22:48 +0000 Message-ID: <1de346bcc550da15f43c9efe05cb98ea57260df2.camel@infradead.org> Subject: [RFC PATCH v1 27/25] docs: Update Xen-on-KVM documentation for PV disk support From: David Woodhouse To: qemu-devel@nongnu.org Cc: Paolo Bonzini , Paul Durrant , Joao Martins , Ankur Arora , Stefano Stabellini , vikram.garhwal@amd.com, Anthony Perard , xen-devel@lists.xenproject.org Date: Tue, 07 Mar 2023 16:22:47 +0000 In-Reply-To: <20230302153435.1170111-1-dwmw2@infradead.org> References: <20230302153435.1170111-1-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-hMr61SxQiFbEJlG4AHmT" 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+9298a7250c90fe94fbb7+7135+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 --=-hMr61SxQiFbEJlG4AHmT Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse Signed-off-by: David Woodhouse --- docs/system/i386/xen.rst | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-) diff --git a/docs/system/i386/xen.rst b/docs/system/i386/xen.rst index a00523b492..f06765e88c 100644 --- a/docs/system/i386/xen.rst +++ b/docs/system/i386/xen.rst @@ -9,6 +9,8 @@ KVM has support for hosting Xen guests, intercepting Xen hy= percalls and event channel (Xen PV interrupt) delivery. This allows guests which expect to be run under Xen to be hosted in QEMU under Linux/KVM instead. =20 +Using the split irqchip is mandatory for Xen support. + Setup ----- =20 @@ -17,14 +19,14 @@ accelerator, for example for Xen 4.10: =20 .. parsed-literal:: =20 - |qemu_system| --accel kvm,xen-version=3D0x4000a + |qemu_system| --accel kvm,xen-version=3D0x4000a,kernel-irqchip=3Dsplit =20 Additionally, virtual APIC support can be advertised to the guest through = the ``xen-vapic`` CPU flag: =20 .. parsed-literal:: =20 - |qemu_system| --accel kvm,xen-version=3D0x4000a --cpu host,+xen_vapic + |qemu_system| --accel kvm,xen-version=3D0x4000a,kernel-irqchip=3Dsplit -= -cpu host,+xen_vapic =20 When Xen support is enabled, QEMU changes hypervisor identification (CPUID 0x40000000..0x4000000A) to Xen. The KVM identification and features are no= t @@ -33,11 +35,25 @@ moves to leaves 0x40000100..0x4000010A. =20 The Xen platform device is enabled automatically for a Xen guest. This all= ows a guest to unplug all emulated devices, in order to use Xen PV block and n= etwork -drivers instead. Note that until the Xen PV device back ends are enabled t= o work -with Xen mode in QEMU, that is unlikely to cause significant joy. Linux gu= ests -can be dissuaded from this by adding 'xen_emul_unplug=3Dnever' on their co= mmand -line, and it can also be noted that AHCI disk controllers are exempt from = being -unplugged, as are passthrough VFIO PCI devices. +drivers instead. Under Xen, the boot disk is typically available both via = IDE +emulation, and as a PV block device. Guest bootloaders typically use IDE t= o load +the guest kernel, which then unplugs the IDE and continues with the Xen PV= block +device. + +This configuration can be achieved as follows + +.. parsed-literal:: + + |qemu_system| -M pc --accel kvm,xen-version=3D0x4000a,kernel-irqchip=3Ds= plit \\ + -drive file=3D${GUEST_IMAGE},if=3Dnone,id=3Ddisk,file.locking=3Doff= -device xen-disk,drive=3Ddisk,vdev=3Dxvda \\ + -drive file=3D${GUEST_IMAGE},index=3D2,media=3Ddisk,file.locking=3D= off,if=3Dide + +It is necessary to use the pc machine type, as the q35 machine uses AHCI i= nstead +of legacy IDE, and AHCI disks are not unplugged through the Xen PV unplug +mechanism. + +VirtIO devices can also be used; Linux guests may need to be dissuaded fro= m +umplugging them by adding 'xen_emul_unplug=3Dnever' on their command line. =20 Properties ---------- --=20 2.34.1 --=-hMr61SxQiFbEJlG4AHmT Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; 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