@@ -176,6 +176,7 @@ extern int boot_menu;
extern bool boot_strict;
extern uint8_t *boot_splash_filedata;
extern size_t boot_splash_filedata_size;
+extern bool enable_mlock;
extern uint8_t qemu_extra_params_fw[2];
extern QEMUClockType rtc_clock;
extern const char *mem_path;
@@ -299,6 +299,11 @@ static bool ufd_version_check(int ufd)
}
+/*
+ * Note: This has the side effect of munlock'ing all of RAM, that's
+ * normally fine since if the postcopy succeeds it gets turned back on at the
+ * end.
+ */
bool postcopy_ram_supported_by_host(void)
{
long pagesize = getpagesize();
@@ -327,6 +332,15 @@ bool postcopy_ram_supported_by_host(void)
}
/*
+ * userfault and mlock don't go together; we'll put it back later if
+ * it was enabled.
+ */
+ if (munlockall()) {
+ perror("postcopy_ram_incoming_init: munlockall");
+ return -1;
+ }
+
+ /*
* We need to check that the ops we need are supported on anon memory
* To do that we need to register a chunk and see the flags that
* are returned.
@@ -517,6 +531,16 @@ int postcopy_ram_incoming_cleanup(MigrationIncomingState *mis)
mis->have_fault_thread = false;
}
+ if (enable_mlock) {
+ if (os_mlock() < 0) {
+ error_report("mlock: %s", strerror(errno));
+ /*
+ * It doesn't feel right to fail at this point, we have a valid
+ * VM state.
+ */
+ }
+ }
+
postcopy_state_set(mis, POSTCOPY_INCOMING_END);
migrate_send_rp_shut(mis, qemu_file_get_error(mis->file) != 0);