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-rw-r--r--include/sysemu/os-posix.h1
-rw-r--r--include/sysemu/os-win32.h5
-rw-r--r--os-posix.c12
-rw-r--r--qemu-options.hx13
-rw-r--r--vl.c34
5 files changed, 65 insertions, 0 deletions
diff --git a/include/sysemu/os-posix.h b/include/sysemu/os-posix.h
index 7f198e475c..25d0b2a73f 100644
--- a/include/sysemu/os-posix.h
+++ b/include/sysemu/os-posix.h
@@ -31,6 +31,7 @@ void os_set_proc_name(const char *s);
void os_setup_signal_handling(void);
void os_daemonize(void);
void os_setup_post(void);
+int os_mlock(void);
typedef struct timeval qemu_timeval;
#define qemu_gettimeofday(tp) gettimeofday(tp, NULL)
diff --git a/include/sysemu/os-win32.h b/include/sysemu/os-win32.h
index 71f5fa0a91..bf8523ada1 100644
--- a/include/sysemu/os-win32.h
+++ b/include/sysemu/os-win32.h
@@ -106,4 +106,9 @@ static inline bool is_daemonized(void)
return false;
}
+static inline int os_mlock(void)
+{
+ return -ENOSYS;
+}
+
#endif
diff --git a/os-posix.c b/os-posix.c
index 5c64518902..d39261d849 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -363,3 +363,15 @@ bool is_daemonized(void)
{
return daemonize;
}
+
+int os_mlock(void)
+{
+ int ret = 0;
+
+ ret = mlockall(MCL_CURRENT | MCL_FUTURE);
+ if (ret < 0) {
+ perror("mlockall");
+ }
+
+ return ret;
+}
diff --git a/qemu-options.hx b/qemu-options.hx
index 5c115d1cf9..e86cc2439d 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2583,6 +2583,19 @@ STEXI
Do not start CPU at startup (you must type 'c' in the monitor).
ETEXI
+DEF("realtime", HAS_ARG, QEMU_OPTION_realtime,
+ "-realtime [mlock=on|off]\n"
+ " run qemu with realtime features\n"
+ " mlock=on|off controls mlock support (default: on)\n",
+ QEMU_ARCH_ALL)
+STEXI
+@item -realtime mlock=on|off
+@findex -realtime
+Run qemu with realtime features.
+mlocking qemu and guest memory can be enabled via @option{mlock=on}
+(enabled by default).
+ETEXI
+
DEF("gdb", HAS_ARG, QEMU_OPTION_gdb, \
"-gdb dev wait for gdb connection on 'dev'\n", QEMU_ARCH_ALL)
STEXI
diff --git a/vl.c b/vl.c
index 2ef00d893a..6caa5f4272 100644
--- a/vl.c
+++ b/vl.c
@@ -521,6 +521,18 @@ static QemuOptsList qemu_tpmdev_opts = {
},
};
+static QemuOptsList qemu_realtime_opts = {
+ .name = "realtime",
+ .head = QTAILQ_HEAD_INITIALIZER(qemu_realtime_opts.head),
+ .desc = {
+ {
+ .name = "mlock",
+ .type = QEMU_OPT_BOOL,
+ },
+ { /* end of list */ }
+ },
+};
+
const char *qemu_get_vm_name(void)
{
return qemu_name;
@@ -1420,6 +1432,20 @@ static void smp_parse(const char *optarg)
max_cpus = smp_cpus;
}
+static void configure_realtime(QemuOpts *opts)
+{
+ bool enable_mlock;
+
+ enable_mlock = qemu_opt_get_bool(opts, "mlock", true);
+
+ if (enable_mlock) {
+ if (os_mlock() < 0) {
+ fprintf(stderr, "qemu: locking memory failed\n");
+ exit(1);
+ }
+ }
+}
+
/***********************************************************/
/* USB devices */
@@ -2862,6 +2888,7 @@ int main(int argc, char **argv, char **envp)
qemu_add_opts(&qemu_add_fd_opts);
qemu_add_opts(&qemu_object_opts);
qemu_add_opts(&qemu_tpmdev_opts);
+ qemu_add_opts(&qemu_realtime_opts);
runstate_init();
@@ -3835,6 +3862,13 @@ int main(int argc, char **argv, char **envp)
exit(1);
}
break;
+ case QEMU_OPTION_realtime:
+ opts = qemu_opts_parse(qemu_find_opts("realtime"), optarg, 0);
+ if (!opts) {
+ exit(1);
+ }
+ configure_realtime(opts);
+ break;
default:
os_parse_cmd_args(popt->index, optarg);
}