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 51F04C3600C for ; Thu, 3 Apr 2025 07:48:53 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1u0FIh-00067T-Nn; Thu, 03 Apr 2025 03:47:47 -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 1u0FIf-000666-0F; Thu, 03 Apr 2025 03:47:45 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1u0FIc-000597-F3; Thu, 03 Apr 2025 03:47:44 -0400 Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 5335jDhK012520; 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Thu, 3 Apr 2025 07:47:30 GMT Received: from smtprelay03.wdc07v.mail.ibm.com ([172.16.1.70]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 45puk03xy9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 03 Apr 2025 07:47:30 +0000 Received: from smtpav04.dal12v.mail.ibm.com (smtpav04.dal12v.mail.ibm.com [10.241.53.103]) by smtprelay03.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 5337lRJp29360828 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 3 Apr 2025 07:47:27 GMT Received: from smtpav04.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 59FAB5805A; Thu, 3 Apr 2025 07:47:29 +0000 (GMT) Received: from smtpav04.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4B01758052; Thu, 3 Apr 2025 07:47:27 +0000 (GMT) Received: from [9.179.24.55] (unknown [9.179.24.55]) by smtpav04.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 3 Apr 2025 07:47:27 +0000 (GMT) Message-ID: <2c11a602415f0780030d4e68a28eee7ffcdd8cb7.camel@linux.ibm.com> Subject: Re: [PATCH v3 0/3] Enable QEMU NVMe userspace driver on s390x From: Niklas Schnelle To: Stefan Hajnoczi , Alex Williamson Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org, qemu-s390x@nongnu.org, fam@euphon.net, philmd@linaro.org, kwolf@redhat.com, hreitz@redhat.com, thuth@redhat.com, mjrosato@linux.ibm.com, Farhan Ali Date: Thu, 03 Apr 2025 09:47:26 +0200 In-Reply-To: <20250402155152.GE304512@fedora> References: <20250401172246.2688-1-alifm@linux.ibm.com> <20250402155152.GE304512@fedora> Autocrypt: addr=schnelle@linux.ibm.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 (3.54.3-1.fc41) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: GFNMsu3z2OUCiPDR21BLWAazKfs9NMU2 X-Proofpoint-GUID: GFNMsu3z2OUCiPDR21BLWAazKfs9NMU2 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-04-03_02,2025-04-02_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 impostorscore=0 bulkscore=0 malwarescore=0 clxscore=1015 suspectscore=0 priorityscore=1501 adultscore=0 phishscore=0 mlxscore=0 lowpriorityscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2504030033 Received-SPF: pass client-ip=148.163.156.1; envelope-from=schnelle@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-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 On Wed, 2025-04-02 at 11:51 -0400, Stefan Hajnoczi wrote: > On Tue, Apr 01, 2025 at 10:22:43AM -0700, Farhan Ali wrote: > > Hi, > >=20 > > Recently on s390x we have enabled mmap support for vfio-pci devices [1]= . >=20 > Hi Alex, > I wanted to bring this to your attention. Feel free to merge it through > the VFIO tree, otherwise I will merge it once you have taken a look. >=20 > Thanks, > Stefan >=20 > > This allows us to take advantage and use userspace drivers on s390x. Ho= wever, > > on s390x we have special instructions for MMIO access. Starting with z1= 5=20 > > (and newer platforms) we have new PCI Memory I/O (MIO) instructions whi= ch=20 > > operate on virtually mapped PCI memory spaces, and can be used from use= rspace. > > On older platforms we would fallback to using existing system calls for= MMIO access. > >=20 > > This patch series introduces support the PCI MIO instructions, and enab= les s390x > > support for the userspace NVMe driver on s390x. I would appreciate any = review/feedback > > on the patches. > >=20 > > Thanks > > Farhan Hi Stefan, the kernel patch actually made it into Linus' tree for v6.15 already as commit aa9f168d55dc ("s390/pci: Support mmap() of PCI resources except for ISM devices") plus prerequisites. This went via the PCI tree because they included a change to struct pci_dev and also enabled mmap() on PCI resource files. Alex reviewed an earlier version and was the one who suggested to also enable mmap() on PCI resources. Thanks, Niklas > >=20 > > [1] https://lore.kernel.org/linux-s390/20250226-vfio_pci_mmap-v7-0-c5c0= f1d26efd@linux.ibm.com/ > >=20 > > ChangeLog > > --------- > > v2 series https://mail.gnu.org/archive/html/qemu-devel/2025-03/msg06847= .html > > v2 -> v3 > > - Update the PCI MMIO APIs to reflect that its PCI MMIO access on h= ost=20 > > as suggested by Stefan(patch 2) > > - Move s390x ifdef check to s390x_pci_mmio.h as suggested by Philip= pe (patch 1) > > - Add R-bs for the respective patches. > >=20 > > v1 series https://mail.gnu.org/archive/html/qemu-devel/2025-03/msg06596= .html > > v1 -> v2 > > - Add 8 and 16 bit reads/writes for completeness (patch 1) > > - Introduce new QEMU PCI MMIO read/write API as suggested by Stefan= (patch 2) > > - Update NVMe userspace driver to use QEMU PCI MMIO functions (patc= h 3) > >=20 > > Farhan Ali (3): > > util: Add functions for s390x mmio read/write > > include: Add a header to define host PCI MMIO functions > > block/nvme: Use host PCI MMIO API > >=20 > > block/nvme.c | 37 +++++---- > > include/qemu/host-pci-mmio.h | 116 ++++++++++++++++++++++++++ > > include/qemu/s390x_pci_mmio.h | 24 ++++++ > > util/meson.build | 2 + > > util/s390x_pci_mmio.c | 148 ++++++++++++++++++++++++++++++++++ > > 5 files changed, 311 insertions(+), 16 deletions(-) > > create mode 100644 include/qemu/host-pci-mmio.h > > create mode 100644 include/qemu/s390x_pci_mmio.h > > create mode 100644 util/s390x_pci_mmio.c > >=20 > > --=20 > > 2.43.0 > >=20