From nobody Tue Feb 10 05:10:10 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1678206202410367.04706431169177; Tue, 7 Mar 2023 08:23:22 -0800 (PST) Received: from list by lists.xenproject.org with outflank-mailman.507589.781289 (Exim 4.92) (envelope-from ) id 1pZa5a-00043h-DV; Tue, 07 Mar 2023 16:22:58 +0000 Received: by outflank-mailman (output) from mailman id 507589.781289; Tue, 07 Mar 2023 16:22:58 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pZa5a-00043a-AO; Tue, 07 Mar 2023 16:22:58 +0000 Received: by outflank-mailman (input) for mailman id 507589; Tue, 07 Mar 2023 16:22:57 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pZa5Z-0003Ki-Js for xen-devel@lists.xenproject.org; Tue, 07 Mar 2023 16:22:57 +0000 Received: from casper.infradead.org (casper.infradead.org [2001:8b0:10b:1236::1]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id 4f48674d-bd04-11ed-a550-8520e6686977; Tue, 07 Mar 2023 17:22:55 +0100 (CET) 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 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 4f48674d-bd04-11ed-a550-8520e6686977 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==; 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 X-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1678206204055100001 --=-hMr61SxQiFbEJlG4AHmT Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- 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 not @@ -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 from +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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