block_util, vhdx: vhdx crate integration with the cloud hypervisor

vhdx_sync.rs in block_util implements traits to represent the vhdx
crate as a supported block device in the cloud hypervisor. The vhdx
is added to the block device list in device_manager.rs at the vmm
crate so that it can automatically detect a vhdx disk and invoke the
corresponding crate.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: Fazla Mehrab <akm.fazla.mehrab@intel.com>

virtio-devices/src/seccomp_filters.rs

@@ -111,6 +111,7 @@ fn virtio_block_thread_rules() -> Vec<(i64, Vec<SeccompRule>)> {
         (libc::SYS_fsync, vec![]),
         (libc::SYS_ftruncate, vec![]),
         (libc::SYS_futex, vec![]),
+        (libc::SYS_getrandom, vec![]),
         (libc::SYS_io_uring_enter, vec![]),
         (libc::SYS_lseek, vec![]),
         (libc::SYS_madvise, vec![]),