migration/postcopy: Add blocktime fault counts per-vcpu

Add a field to count how many remote faults one vCPU has taken.  So far
it's still not used, but will be soon.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20250613141217.474825-8-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>
1 file changed