Add option to use file backed guest memory

Port qemu-kvm's -mem-path and -mem-prealloc options. These are useful
for backing guest memory with huge pages via hugetlbfs.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
CC: john cooper <john.cooper@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/vl.c b/vl.c
index db7a178f88..274d847294 100644
--- a/vl.c
+++ b/vl.c
@@ -185,6 +185,10 @@ enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
 DisplayType display_type = DT_DEFAULT;
 const char* keyboard_layout = NULL;
 ram_addr_t ram_size;
+const char *mem_path = NULL;
+#ifdef MAP_POPULATE
+int mem_prealloc = 0; /* force preallocation of physical target memory */
+#endif
 int nb_nics;
 NICInfo nd_table[MAX_NICS];
 int vm_running;
@@ -5216,6 +5220,14 @@ int main(int argc, char **argv, char **envp)
                 ram_size = value;
                 break;
             }
+            case QEMU_OPTION_mempath:
+                mem_path = optarg;
+                break;
+#ifdef MAP_POPULATE
+            case QEMU_OPTION_mem_prealloc:
+                mem_prealloc = 1;
+                break;
+#endif
             case QEMU_OPTION_d:
                 {
                     int mask;