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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 9B5294000A X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: ijetrc8s3hqnuczx4cnoyjokfmqpibn7 X-HE-Tag: 1764872219-847650 X-HE-Meta: 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 zIPtOoBg 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 12/4/25 16:09, Peter Xu wrote: > This series is based on v6.18. It allows mmap(!MAP_FIXED) to work with > huge pfnmaps with best effort. Meanwhile, it enables it for vfio-pci as > the first user. > > v1: https://lore.kernel.org/r/20250613134111.469884-1-peterx@redhat.com > > A changelog may not apply because all the patches were rewrote based on a > new interface this v2 introduced. Hence omitted. > > In this version, a new file operation, get_mapping_order(), is introduced > (based on discussion with Jason on v1) to minimize the code needed for > drivers to implement this. It also helps avoid exporting any mm functions. > One can refer to the discussion in v1 for more information. > > Currently, get_mapping_order() API is define as: > > int (*get_mapping_order)(struct file *file, unsigned long pgoff, size_t len); > > The first argument is the file pointer, the 2nd+3rd are the pgoff+len > specified from a mmap() request. The driver can use this interface to > opt-in providing mapping order hints to core mm on VA allocations for the > range of the file specified. I kept the interface as simple for now, so > that core mm will always do the alignment with pgoff assuming that would > always work. The driver can only report the order from pgoff+len, which > will be used to do the alignment. > > Before this series, an userapp in most cases need to be modified to benefit > from huge mappings to provide huge size aligned VA using MAP_FIXED. After > this series, the userapp can benefit from huge pfnmap automatically after > the kernel upgrades, with no userspace modifications. > > It's still best-effort, because the auto-alignment will require a larger VA > range to be allocated via the per-arch allocator, hence if the huge-mapping > aligned VA cannot be allocated then it'll still fallback to small mappings > like before. However that's from theory POV: in reality I don't yet know > when it'll fail especially when on a 64bits system. > > So far, only vfio-pci is supported. But the logic should be applicable to > all the drivers that support or will support huge pfnmaps. I've copied > some more people in this version too from hardware perspective. > > For testings: > > - checkpatch.pl > - cross build harness > - unit test that I got from Alex [1], checking mmap() alignments on a QEMU > instance with an 128MB bar. > > Checking the alignments look all sane with mmap(!MAP_FIXED), and huge > mappings properly installed. I didn't observe anything wrong. > > I currently lack larger bars to test PUD sizes. Please kindly report if > one can run this with 1G+ bars and hit issues. LGTM, with a 32G BAR : Using device 0000:02:00.0 in IOMMU group 27 Device 0000:02:00.0 supports 9 regions, 5 irqs [BAR0]: size 0x1000000, order 24, offset 0x0, flags 0xf Testing BAR0, require at least 21 bit alignment [PASS] Minimum alignment 21 Testing random offset [PASS] Random offset Testing random size [PASS] Random size [BAR1]: size 0x800000000, order 35, offset 0x10000000000, flags 0x7 Testing BAR1, require at least 30 bit alignment [PASS] Minimum alignment 31 Testing random offset [PASS] Random offset Testing random size [PASS] Random size [BAR3]: size 0x2000000, order 25, offset 0x30000000000, flags 0x7 Testing BAR3, require at least 21 bit alignment [PASS] Minimum alignment 21 Testing random offset [PASS] Random offset Testing random size [PASS] Random size C. > > Alex Mastro: thanks for the testing offered in v1, but since this series > was rewritten, a re-test will be needed. I hence didn't collect the T-b. > > Comments welcomed, thanks. > > [1] https://github.com/awilliam/tests/blob/vfio-pci-device-map-alignment/vfio-pci-device-map-alignment.c > > Peter Xu (4): > mm/thp: Allow thp_get_unmapped_area_vmflags() to take alignment > mm: Add file_operations.get_mapping_order() > vfio: Introduce vfio_device_ops.get_mapping_order hook > vfio-pci: Best-effort huge pfnmaps with !MAP_FIXED mappings > > Documentation/filesystems/vfs.rst | 4 +++ > drivers/vfio/pci/vfio_pci.c | 1 + > drivers/vfio/pci/vfio_pci_core.c | 49 ++++++++++++++++++++++++++ > drivers/vfio/vfio_main.c | 14 ++++++++ > include/linux/fs.h | 1 + > include/linux/huge_mm.h | 5 +-- > include/linux/vfio.h | 5 +++ > include/linux/vfio_pci_core.h | 2 ++ > mm/huge_memory.c | 7 ++-- > mm/mmap.c | 58 +++++++++++++++++++++++++++---- > 10 files changed, 135 insertions(+), 11 deletions(-) >