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Thu, 20 Jun 2024 12:06:37 GMT Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9791C58068; Thu, 20 Jun 2024 12:06:33 +0000 (GMT) Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C7C1F58054; Thu, 20 Jun 2024 12:06:30 +0000 (GMT) Received: from [9.171.74.145] (unknown [9.171.74.145]) by smtpav06.wdc07v.mail.ibm.com (Postfix) with ESMTP; Thu, 20 Jun 2024 12:06:30 +0000 (GMT) Message-ID: Subject: Re: [PATCH v3 2/3] vfio/pci: Tolerate oversized BARs by disallowing mmap From: Niklas Schnelle To: Christoph Hellwig Cc: Alex Williamson , 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, 20 Jun 2024 14:06:29 +0200 In-Reply-To: References: <20240529-vfio_pci_mmap-v3-0-cd217d019218@linux.ibm.com> <20240529-vfio_pci_mmap-v3-2-cd217d019218@linux.ibm.com> <20240618095134.41478bbf.alex.williamson@redhat.com> <76a840711f7c073e52149107aa62045c462d7033.camel@linux.ibm.com> Autocrypt: addr=schnelle@linux.ibm.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.2 (3.52.2-1.fc40) Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: E7UrQA2-DXnhowYQNDMq2MBeJAUW1nvf X-Proofpoint-GUID: W5ZOa8ZInFEMGYCDjcKD3NwJagn2Lily 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=2024-06-20_07,2024-06-20_02,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 spamscore=0 bulkscore=0 clxscore=1015 adultscore=0 phishscore=0 suspectscore=0 mlxscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 mlxlogscore=689 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406200085 On Wed, 2024-06-19 at 21:09 -0700, Christoph Hellwig wrote: > On Wed, Jun 19, 2024 at 12:56:47PM +0200, Niklas Schnelle wrote: > > In short, the ISM BAR 0 is stupidly large but this is intentional. It > > not fitting in the VMAP is simply the least crazy filter I could come > > up with to keep the ISM device from causing trouble for use of vfio-pci > > mmap() for other, normal, PCI devices. >=20 > Then maybe add a PCI quirk to prevent mapping it. This would also > affect the sysfs resource0 file unless I'm missing something. >=20 The resource files are globally disabled on s390x due to lack of HAVE_PCI_MMAP/ARCH_GENERIC_PCI_MMAP_RESOURCE at the moment. I might change that in the future with a analogous argument as for VFIO_PCI_MMAP but for its not there. Once we add it we of course need the same special ISM treatment there too. Looking at the existing PCI quirks I don't see anything that would fit so I'm guessing you would want to add a new quirk? As I understand it we would then have to export something like a is_pci_mmap_broken(pdev) function while currently the only quirk function that seems to be exported is pxi_fixup_device(). But then what happens if CONFIG_PCI_QUIRKS=3Dn? Also the header comment in drivers/pci/quirks.c says that platform specific devices shouldn't go in there and ISM is platform specific. Instead of exporting IOREMAP_START/IOREMAP_END maybe there is another reasonable maximum resource length? Or maybe we could create a size_t ioremap_area_size() helper similar to is_ioremap_addr() but not inlined. The latter already uses IOREMAP_START/IOREMAP_END so not sure how that works when IOREMAP_END is not exported? Thanks, Niklas