From nobody Tue Oct 28 04:18:22 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1515576273135715.2742103672125; Wed, 10 Jan 2018 01:24:33 -0800 (PST) Received: from localhost ([::1]:56031 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZCca-0001MO-9X for importer@patchew.org; Wed, 10 Jan 2018 04:24:32 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49123) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eZCY5-0005wS-Gi for qemu-devel@nongnu.org; Wed, 10 Jan 2018 04:19:57 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eZCY4-0000OK-Kb for qemu-devel@nongnu.org; Wed, 10 Jan 2018 04:19:53 -0500 Received: from mx1.redhat.com ([209.132.183.28]:53322) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eZCY1-0000MN-JA; Wed, 10 Jan 2018 04:19:49 -0500 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id BAD1D7A168; Wed, 10 Jan 2018 09:19:48 +0000 (UTC) Received: from lemon.usersys.redhat.com (ovpn-12-52.pek2.redhat.com [10.72.12.52]) by smtp.corp.redhat.com (Postfix) with ESMTP id C51547B8D4; Wed, 10 Jan 2018 09:19:43 +0000 (UTC) From: Fam Zheng To: qemu-devel@nongnu.org Date: Wed, 10 Jan 2018 17:18:45 +0800 Message-Id: <20180110091846.10699-9-famz@redhat.com> In-Reply-To: <20180110091846.10699-1-famz@redhat.com> References: <20180110091846.10699-1-famz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Wed, 10 Jan 2018 09:19:48 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v4 8/9] docs: Add section for NVMe VFIO driver X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Fam Zheng , qemu-block@nongnu.org, Markus Armbruster , Max Reitz , Keith Busch , Stefan Hajnoczi , Paolo Bonzini , Karl Rister Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Fam Zheng --- docs/qemu-block-drivers.texi | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/docs/qemu-block-drivers.texi b/docs/qemu-block-drivers.texi index 503c1847aa..66b27cc4f7 100644 --- a/docs/qemu-block-drivers.texi +++ b/docs/qemu-block-drivers.texi @@ -785,6 +785,38 @@ warning: ssh server @code{ssh.example.com:22} does not= support fsync With sufficiently new versions of libssh2 and OpenSSH, @code{fsync} is supported. =20 +@node disk_images_nvme +@subsection NVMe disk images + +You can access disk images on a NVMe controller with the built-in VFIO bas= ed +NVMe driver. Before starting QEMU, bind the host NVMe controller to vfio-p= ci. +For example: + +@example +# modprobe vfio-pci +# lspci -n -s 0000:06:0d.0 +06:0d.0 0401: 1102:0002 (rev 08) +# echo 0000:06:0d.0 > /sys/bus/pci/devices/0000:06:0d.0/driver/unbind +# echo 1102 0002 > /sys/bus/pci/drivers/vfio-pci/new_id + +# qemu-system-x86_64 -drive file=3Dnvme://@var{host}:@var{bus}:@var{slot}.= @var{func}/@var{namespace} +@end example + +Alternative syntax using properties: + +@example +qemu-system-x86_64 -drive file.driver=3Dnvme,file.device=3D@var{host}:@var= {bus}:@var{slot}.@var{func},file.namespace=3D@var{namespace} +@end example + +@var{host}:@var{bus}:@var{slot}.@var{func} is the NVMe controller's PCI de= vice +address on the host. + +@var{namespace} is the NVMe namespace number, starting from 1. + +The controller will be exclusively used by the QEMU process once started. = To be +able to share storage between multiple VMs and other applications on the h= ost, +please use file based protocols. + @node disk_image_locking @subsection Disk image file locking =20 --=20 2.14.3