3 Commits

Author	SHA1	Message	Date
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
Keith Adler	1a74c666e5	vmm: trim qualified paths in uffd ... Import common std types used by the userfaultfd wrapper instead of spelling the full paths at every use site. Signed-off-by: Keith Adler <kadler@cloudflare.com>	2026-05-07 08:52:42 +01:00
Shayon Mukherjee	8340307ace	vmm: add uffd abstraction module ... Add safe Rust wrappers around the raw userfaultfd ioctls: create (syscall + API handshake), register (missing-page mode), copy (resolve fault), and wake (unblock threads after EEXIST race). These are used by the demand-paged snapshot restore handler in a subsequent commit. Signed-off-by: Shayon Mukherjee <shayonj@gmail.com>	2026-03-13 21:17:21 +00:00