Raise soft address space limit to hard limit

For SLES we want users to be able to use large memory configurations
with KVM without fiddling with ulimit -Sv.

Signed-off-by: Andreas Färber <afaerber@suse.de>
[BR: add include for sys/resource.h]
Signed-off-by: Bruce Rogers <brogers@suse.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/vl.c b/vl.c
index bf0a6345d..68de8184f 100644
--- a/vl.c
+++ b/vl.c
@@ -33,6 +33,7 @@
 #include "qemu/uuid.h"
 #include "sysemu/reset.h"
 #include "sysemu/runstate.h"
+#include <sys/resource.h>
 #include "sysemu/seccomp.h"
 #include "sysemu/tcg.h"
 
@@ -2863,6 +2864,7 @@ int main(int argc, char **argv, char **envp)
     char *dir, **dirs;
     BlockdevOptionsQueue bdo_queue = QSIMPLEQ_HEAD_INITIALIZER(bdo_queue);
     QemuPluginList plugin_list = QTAILQ_HEAD_INITIALIZER(plugin_list);
+    struct rlimit rlimit_as;
 
     os_set_line_buffering();
 
@@ -2874,6 +2876,16 @@ int main(int argc, char **argv, char **envp)
 
     qemu_mutex_lock_iothread();
 
+    /*
+     * Try to raise the soft address space limit.
+     * Default on SLES 11 SP2 is 80% of physical+swap memory.
+     */
+    getrlimit(RLIMIT_AS, &rlimit_as);
+    if (rlimit_as.rlim_cur < rlimit_as.rlim_max) {
+        rlimit_as.rlim_cur = rlimit_as.rlim_max;
+        setrlimit(RLIMIT_AS, &rlimit_as);
+    }
+
     atexit(qemu_run_exit_notifiers);
     qemu_init_exec_dir(argv[0]);