From f0a227ade4b0331c9e12fc01f8b74e2531fd496d Mon Sep 17 00:00:00 2001 From: "Dr. David Alan Gilbert" Date: Thu, 5 Nov 2015 18:11:04 +0000 Subject: postcopy: ram_enable_notify to switch on userfault 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 Reviewed-by: David Gibson Reviewed-by: Juan Quintela Reviewed-by: Amit Shah Signed-off-by: Juan Quintela --- include/migration/migration.h | 3 +++ include/migration/postcopy-ram.h | 6 ++++++ 2 files changed, 9 insertions(+) (limited to 'include/migration') diff --git a/include/migration/migration.h b/include/migration/migration.h index 6e42b58..2ad0d2b 100644 --- a/include/migration/migration.h +++ b/include/migration/migration.h @@ -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; diff --git a/include/migration/postcopy-ram.h b/include/migration/postcopy-ram.h index f87020c..b10c03d 100644 --- a/include/migration/postcopy-ram.h +++ b/include/migration/postcopy-ram.h @@ -17,6 +17,12 @@ 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. * called from ram.c's similarly named ram_postcopy_incoming_init -- cgit v1.1