X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;ds=sidebyside;f=src%2Fguestfs.c;h=0e91b96b92dca4873b37475c57dda29a15a6d914;hb=891aac7a0c35eb25f853c3960eadf8f1f22ca60b;hp=1d6d40bf7322edfb98c81108e384412b42ec0860;hpb=214babb060d9e85e72bad4633310a9b4a5fcb9dd;p=libguestfs.git

diff --git a/src/guestfs.c b/src/guestfs.c
index 1d6d40b..0e91b96 100644
--- a/src/guestfs.c
+++ b/src/guestfs.c
@@ -748,7 +748,8 @@ guestfs__config (guestfs_h *g,
 }
 
 int
-guestfs__add_drive (guestfs_h *g, const char *filename)
+guestfs__add_drive_with_if (guestfs_h *g, const char *filename,
+                            const char *drive_if)
 {
   size_t len = strlen (filename) + 64;
   char buf[len];
@@ -771,12 +772,12 @@ guestfs__add_drive (guestfs_h *g, const char *filename)
   int fd = open (filename, O_RDONLY|O_DIRECT);
   if (fd >= 0) {
     close (fd);
-    snprintf (buf, len, "file=%s,cache=off,if=" DRIVE_IF, filename);
+    snprintf (buf, len, "file=%s,cache=off,if=%s", filename, drive_if);
   } else {
     fd = open (filename, O_RDONLY);
     if (fd >= 0) {
       close (fd);
-      snprintf (buf, len, "file=%s,if=" DRIVE_IF, filename);
+      snprintf (buf, len, "file=%s,if=%s", filename, drive_if);
     } else {
       perrorf (g, "%s", filename);
       return -1;
@@ -787,7 +788,8 @@ guestfs__add_drive (guestfs_h *g, const char *filename)
 }
 
 int
-guestfs__add_drive_ro (guestfs_h *g, const char *filename)
+guestfs__add_drive_ro_with_if (guestfs_h *g, const char *filename,
+                               const char *drive_if)
 {
   size_t len = strlen (filename) + 64;
   char buf[len];
@@ -802,12 +804,24 @@ guestfs__add_drive_ro (guestfs_h *g, const char *filename)
     return -1;
   }
 
-  snprintf (buf, len, "file=%s,snapshot=on,if=%s", filename, DRIVE_IF);
+  snprintf (buf, len, "file=%s,snapshot=on,if=%s", filename, drive_if);
 
   return guestfs__config (g, "-drive", buf);
 }
 
 int
+guestfs__add_drive (guestfs_h *g, const char *filename)
+{
+  return guestfs__add_drive_with_if (g, filename, DRIVE_IF);
+}
+
+int
+guestfs__add_drive_ro (guestfs_h *g, const char *filename)
+{
+  return guestfs__add_drive_ro_with_if (g, filename, DRIVE_IF);
+}
+
+int
 guestfs__add_cdrom (guestfs_h *g, const char *filename)
 {
   if (strchr (filename, ',') != NULL) {
@@ -858,6 +872,7 @@ static void print_timestamped_message (guestfs_h *g, const char *fs, ...);
 static int build_supermin_appliance (guestfs_h *g, const char *path, char **kernel, char **initrd);
 static int test_qemu (guestfs_h *g);
 static int qemu_supports (guestfs_h *g, const char *option);
+static int is_openable (guestfs_h *g, const char *path, int flags);
 static void print_cmdline (guestfs_h *g);
 
 static const char *kernel_name = "vmlinuz." REPO "." host_cpu;
@@ -1091,6 +1106,22 @@ guestfs__launch (guestfs_h *g)
      */
     g->cmdline[0] = g->qemu;
 
+    /* qemu sometimes needs this option to enable hardware
+     * virtualization, but some versions of 'qemu-kvm' will use KVM
+     * regardless (even where this option appears in the help text).
+     * It is rumoured that there are versions of qemu where supplying
+     * this option when hardware virtualization is not available will
+     * cause qemu to fail, so we we have to check at least that
+     * /dev/kvm is openable.  That's not reliable, since /dev/kvm
+     * might be openable by qemu but not by us (think: SELinux) in
+     * which case the user would not get hardware virtualization,
+     * although at least shouldn't fail.  A giant clusterfuck with the
+     * qemu command line, again.
+     */
+    if (qemu_supports (g, "-enable-kvm") &&
+        is_openable (g, "/dev/kvm", O_RDWR))
+      add_cmdline (g, "-enable-kvm");
+
     /* Newer versions of qemu (from around 2009/12) changed the
      * behaviour of monitors so that an implicit '-monitor stdio' is
      * assumed if we are in -nographic mode and there is no other
@@ -1547,7 +1578,7 @@ print_timestamped_message (guestfs_h *g, const char *fs, ...)
   va_list args;
   char *msg;
   int err;
-  struct timeval tv, diff;
+  struct timeval tv;
 
   va_start (args, fs);
   err = vasprintf (&msg, fs, args);
@@ -1647,6 +1678,20 @@ qemu_supports (guestfs_h *g, const char *option)
   return g->qemu_help && strstr (g->qemu_help, option) != NULL;
 }
 
+/* Check if a file can be opened. */
+static int
+is_openable (guestfs_h *g, const char *path, int flags)
+{
+  int fd = open (path, flags);
+  if (fd == -1) {
+    if (g->verbose)
+      perror (path);
+    return 0;
+  }
+  close (fd);
+  return 1;
+}
+
 /* Check the peer effective UID for a TCP socket.  Ideally we'd like
  * SO_PEERCRED for a loopback TCP socket.  This isn't possible on
  * Linux (but it is on Solaris!) so we read /proc/net/tcp instead.
@@ -2588,7 +2633,6 @@ guestfs___recv_file (guestfs_h *g, const char *filename)
 {
   void *buf;
   int fd, r;
-  size_t len;
 
   fd = open (filename, O_WRONLY|O_CREAT|O_TRUNC|O_NOCTTY, 0666);
   if (fd == -1) {