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| author | Peter Xu <peterx@redhat.com> | 2023-02-07 15:57:11 -0500 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2023-02-11 16:51:09 +0100 |
| commit | c40c0463413b941c13fe5f99a90c02d7d6584828 (patch) | |
| tree | c34bd6ea8ec1f18b2313db12c20fc5d120c564fa /util/trace-events | |
| parent | 93e0932b7be2498024cd6ba8446a0fa2cb1769bc (diff) | |
| download | qemu-c40c0463413b941c13fe5f99a90c02d7d6584828.zip qemu-c40c0463413b941c13fe5f99a90c02d7d6584828.tar.gz qemu-c40c0463413b941c13fe5f99a90c02d7d6584828.tar.bz2 | |
util/userfaultfd: Support /dev/userfaultfd
Teach QEMU to use /dev/userfaultfd when it existed and fallback to the
system call if either it's not there or doesn't have enough permission.
Firstly, as long as the app has permission to access /dev/userfaultfd, it
always have the ability to trap kernel faults which QEMU mostly wants.
Meanwhile, in some context (e.g. containers) the userfaultfd syscall can be
forbidden, so it can be the major way to use postcopy in a restricted
environment with strict seccomp setup.
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'util/trace-events')
| -rw-r--r-- | util/trace-events | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/util/trace-events b/util/trace-events index c8f53d7..16f78d8 100644 --- a/util/trace-events +++ b/util/trace-events @@ -93,6 +93,7 @@ qemu_vfio_region_info(const char *desc, uint64_t region_ofs, uint64_t region_siz qemu_vfio_pci_map_bar(int index, uint64_t region_ofs, uint64_t region_size, int ofs, void *host) "map region bar#%d addr 0x%"PRIx64" size 0x%"PRIx64" ofs 0x%x host %p" #userfaultfd.c +uffd_detect_open_mode(int mode) "%d" uffd_query_features_nosys(int err) "errno: %i" uffd_query_features_api_failed(int err) "errno: %i" uffd_create_fd_nosys(int err) "errno: %i" |