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postcopy: ram_enable_notify to switch on userfault

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Mark the area of RAM as 'userfault'
Start up a fault-thread to handle any userfaults we might receive
from it (to be filled in later)

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2015-11-05 18:11:04 +00:00 • committed by Juan Quintela
parent 1caddf8a81
commit f0a227ade4
4 changed files with 87 additions and 0 deletions
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3
include/migration/migration.h
View file

@ -86,6 +86,9 @@ struct MigrationIncomingState {
*/
QemuEvent main_thread_load_event;
QemuThread fault_thread;
QemuSemaphore fault_thread_sem;
/* For the kernel to send us notifications */
int userfault_fd;
QEMUFile *to_src_file;

6
include/migration/postcopy-ram.h
View file

@ -16,6 +16,12 @@
/* Return true if the host supports everything we need to do postcopy-ram */
bool postcopy_ram_supported_by_host(void);
/*
* Make all of RAM sensitive to accesses to areas that haven't yet been written
* and wire up anything necessary to deal with it.
*/
int postcopy_ram_enable_notify(MigrationIncomingState *mis);
/*
* Initialise postcopy-ram, setting the RAM to a state where we can go into
* postcopy later; must be called prior to any precopy.