Roberto Campesato fff674a27d vmm: prefer /dev/userfaultfd over the syscall ...

Prefer /dev/userfaultfd (Linux 6.1+) over the userfaultfd(2) syscall
for obtaining userfaultfd file descriptors.  The device path bypasses
the capable(CAP_SYS_PTRACE) and vm.unprivileged_userfaultfd sysctl
checks that block the syscall in user-namespaced containers, using
file permissions instead.

Falls back to the syscall on older kernels or when the device node
does not exist.

Signed-off-by: Roberto Campesato <render@metalabs.org>
Assisted-by: Claude:claude-opus-4-6

2026-05-07 21:37:46 +00:00

..

api

vmm, pci, openapi: Add VFIO mmap BAR exclusion

2026-05-06 14:15:41 +00:00

igvm

vmm: fix UB in load_igvm(...)

2026-05-04 08:22:29 +00:00

acpi.rs

vmm: replace as <pointer> casts with safer alternatives

2026-05-03 08:38:31 +00:00

clone3.rs

build: treewide: fmt for edition 2024

2025-09-10 18:35:38 +00:00

config.rs

vmm, pci, openapi: Add VFIO mmap BAR exclusion

2026-05-06 14:15:41 +00:00

console_devices.rs

vmm: replace as <pointer> casts with safer alternatives

2026-05-03 08:38:31 +00:00

coredump.rs

misc: vmm: streamline error Display::fmt()

2025-06-13 19:55:54 +00:00

cpu.rs

vmm: replace as <pointer> casts with safer alternatives

2026-05-03 08:38:31 +00:00

device_manager.rs

vmm, pci, openapi: Add VFIO mmap BAR exclusion

2026-05-06 14:15:41 +00:00

device_tree.rs

tests: streamline module names to unit_tests

2025-11-20 21:15:03 +00:00

gdb.rs

vmm: gdb: Use map_or instead of map().unwrap_or()

2026-03-06 12:32:38 +00:00

interrupt.rs

vmm: interrupt: Allocate GSIs for MSI/MSI-X interrupt vectors lazily

2026-04-01 01:25:44 +00:00

landlock.rs

misc: clippy: add unnecessary_semicolon

2025-11-21 09:32:11 +00:00

lib.rs

vmm: support migration of paused VMs

2026-05-04 09:30:30 +00:00

memory_manager.rs

vmm: memory_manager: test: build sparse fixtures via PUNCH_HOLE

2026-05-05 08:42:56 +00:00

migration_transport.rs

vmm: add upper limit for amount of parallel connections during migration

2026-04-02 23:43:42 +00:00

migration.rs

misc: clippy: add uninlined_format_args

2025-11-21 09:32:11 +00:00

pci_segment.rs

pci: Add support for reserving but not allocating slots

2026-04-17 07:45:22 +00:00

seccomp_filters.rs

vmm: prefer /dev/userfaultfd over the syscall

2026-05-07 21:37:46 +00:00

serial_manager.rs

vmm: serial_manager: Use OwnedFd for the epoll FD

2026-03-06 21:04:14 +00:00

sev.rs

vmm: Add unit tests for generating hash blocks for SEV-SNP

2026-05-01 20:28:55 +00:00

sigwinch_listener.rs

misc: clippy: add needless_pass_by_value

2025-11-27 17:11:14 +00:00

sync_utils.rs

vmm: implement a gate

2026-04-02 23:43:42 +00:00

uffd.rs

vmm: prefer /dev/userfaultfd over the syscall

2026-05-07 21:37:46 +00:00

userfaultfd.rs

vmm: prefer /dev/userfaultfd over the syscall

2026-05-07 21:37:46 +00:00

vm_config.rs

vmm, pci, openapi: Add VFIO mmap BAR exclusion

2026-05-06 14:15:41 +00:00

vm.rs

vmm: replace as <pointer> casts with safer alternatives

2026-05-03 08:38:31 +00:00