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Thu, 11 Jul 2024 10:20:19 GMT Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8261A5805D; Thu, 11 Jul 2024 10:20:17 +0000 (GMT) Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 15E8658059; Thu, 11 Jul 2024 10:20:15 +0000 (GMT) Received: from [9.61.80.103] (unknown [9.61.80.103]) by smtpav06.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 11 Jul 2024 10:20:14 +0000 (GMT) Message-ID: <15f117b4a9e0481aaa6fd5848a58d16900a65679.camel@linux.ibm.com> Subject: Re: [PATCH v4 4/4] vfio/pci: Enable PCI resource mmap() on s390 and remove VFIO_PCI_MMAP From: Niklas Schnelle To: Alex Williamson Cc: Bjorn Helgaas , Christoph Hellwig , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Gerd Bayer , Matthew Rosato , Jason Gunthorpe , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Date: Thu, 11 Jul 2024 12:20:14 +0200 In-Reply-To: <20240704101634.30b542a2.alex.williamson@redhat.com> References: <20240626-vfio_pci_mmap-v4-0-7f038870f022@linux.ibm.com> <20240626-vfio_pci_mmap-v4-4-7f038870f022@linux.ibm.com> <20240704101634.30b542a2.alex.williamson@redhat.com> Autocrypt: addr=schnelle@linux.ibm.com; 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charset="UTF-8" User-Agent: Evolution 3.52.3 (3.52.3-1.fc40) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: F6K5K9XJKonzOU57YGDueo5RsrojuhvP X-Proofpoint-ORIG-GUID: X4V1Si7hLJSvVjAY9lor1y1Utv51v5Ak Content-Transfer-Encoding: quoted-printable X-Proofpoint-UnRewURL: 0 URL was un-rewritten Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-11_06,2024-07-10_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 mlxlogscore=676 lowpriorityscore=0 adultscore=0 malwarescore=0 mlxscore=0 priorityscore=1501 phishscore=0 impostorscore=0 clxscore=1011 suspectscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2406140001 definitions=main-2407110069 On Thu, 2024-07-04 at 10:16 -0600, Alex Williamson wrote: > On Wed, 26 Jun 2024 13:15:51 +0200 > Niklas Schnelle wrote: >=20 > > With the introduction of memory I/O (MIO) instructions enbaled in commit > > 71ba41c9b1d9 ("s390/pci: provide support for MIO instructions") s390 > > gained support for direct user-space access to mapped PCI resources. > > Even without those however user-space can access mapped PCI resources > > via the s390 specific MMIO syscalls. Thus mmap() can and should be > > supported on all s390 systems with native PCI. Since VFIO_PCI_MMAP > > enablement for s390 would make it unconditionally true and thus > > pointless just remove it entirely. > >=20 > > Link: https://lore.kernel.org/all/c5ba134a1d4f4465b5956027e6a4ea6f6beff= 969.camel@linux.ibm.com/ > > Suggested-by: Jason Gunthorpe > > Reviewed-by: Matthew Rosato > > Reviewed-by: Jason Gunthorpe > > Signed-off-by: Niklas Schnelle > > --- > > drivers/vfio/pci/Kconfig | 4 ---- > > drivers/vfio/pci/vfio_pci_core.c | 3 --- > > 2 files changed, 7 deletions(-) >=20 > I think you're planning a v5 which drops patch 3/ of this series and > finesses the commit log of patch 2/ a bit. This has become much less a > vfio series, so if you want to commit through s390, >=20 > Acked-by: Alex Williamson >=20 > Thanks, > Alex >=20 Thank you! Yes I will send a v5. I actually already pushed a changed version to my git.kernel.org branch but we're still discussing internally because pdev->non_compliant_bars respectively the resulting removal of the resources is interfering with future work on user-space vfio-pci use of the ISM device with a vfio-pci-ism variant driver. Thanks, Niklas