Add a new Linux-specific memory backend, similar to hostmem-file, except that it doesn't need file path. It also try to enforce memory sealing if available. It is thus slightly easier and secure, and is compatible with transparent huge-pages since Linux 4.8.
The first 6 patches are mostly cleanups and could be considered regardless of memfd hostmem acceptability. v3: - make vhost-user-test use memfd only if possible - rebased v1->v2: - make it linux-specific - minor changes and commit message tweaks Marc-André Lureau (9): exec: check kvm mmu notifiers earlier exec: split file_ram_alloc() exec: split qemu_ram_alloc_from_file() Add memory_region_init_ram_from_fd() ivshmem: use ram_from_fd() memory: remove memory_region_set_fd memfd: split qemu_memfd_alloc() Add memfd based hostmem tests: use memfd in vhost-user-test include/exec/memory.h | 31 ++++++++----- include/exec/ram_addr.h | 3 ++ include/qemu/memfd.h | 2 + backends/hostmem-memfd.c | 67 +++++++++++++++++++++++++++ exec.c | 116 ++++++++++++++++++++++++++++------------------- hw/misc/ivshmem.c | 14 +++--- memory.c | 26 +++++++---- tests/vhost-user-test.c | 68 +++++++++++++++++---------- util/memfd.c | 42 ++++++++++------- backends/Makefile.objs | 2 + qemu-options.hx | 11 +++++ 11 files changed, 266 insertions(+), 116 deletions(-) create mode 100644 backends/hostmem-memfd.c -- 2.13.0.91.g00982b8dd
