X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=src%2Flaunch.c;h=310a88dd7b2f03b4be76c853b870badfe9b44785;hb=7e484865894b98de7a976a688c19e64bdd13dade;hp=ecc0464a88edfa09d20a3b6cc964d6c727d9bdd4;hpb=7065a453cb09caa216924fd3d8cc913a48e0f942;p=libguestfs.git

diff --git a/src/launch.c b/src/launch.c
index ecc0464..310a88d 100644
--- a/src/launch.c
+++ b/src/launch.c
@@ -64,6 +64,7 @@
 
 #include "c-ctype.h"
 #include "glthread/lock.h"
+#include "ignore-value.h"
 
 #include "guestfs.h"
 #include "guestfs-internal.h"
@@ -487,21 +488,30 @@ launch_appliance (guestfs_h *g)
     if (qemu_supports (g, "-nodefconfig"))
       add_cmdline (g, "-nodefconfig");
 
-    /* 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.
+    /* The qemu -machine option (added 2010-12) is a bit more sane
+     * since it falls back through various different acceleration
+     * modes, so try that first (thanks Markus Armbruster).
      */
-    if (qemu_supports (g, "-enable-kvm") &&
-        is_openable (g, "/dev/kvm", O_RDWR))
-      add_cmdline (g, "-enable-kvm");
+    if (qemu_supports (g, "-machine")) {
+      add_cmdline (g, "-machine");
+      add_cmdline (g, "accel=kvm:tcg");
+    } else {
+      /* 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
@@ -616,17 +626,27 @@ launch_appliance (guestfs_h *g)
       guestfs___print_timestamped_argv (g, (const char **)g->cmdline);
 
     if (!g->direct) {
-      /* Set up stdin, stdout. */
+      /* Set up stdin, stdout, stderr. */
       close (0);
       close (1);
       close (wfd[1]);
       close (rfd[0]);
 
+      /* Stdin. */
       if (dup (wfd[0]) == -1) {
       dup_failed:
         perror ("dup failed");
         _exit (EXIT_FAILURE);
       }
+      /* Stdout. */
+      if (dup (rfd[1]) == -1)
+        goto dup_failed;
+
+      /* Particularly since qemu 0.15, qemu spews all sorts of debug
+       * information on stderr.  It is useful to both capture this and
+       * not confuse casual users, so send stderr to the pipe as well.
+       */
+      close (2);
       if (dup (rfd[1]) == -1)
         goto dup_failed;
 
@@ -669,7 +689,7 @@ launch_appliance (guestfs_h *g)
       pid_t parent_pid = getppid ();
 
       /* Writing to argv is hideously complicated and error prone.  See:
-       * http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/ps_status.c?rev=1.33.2.1;content-type=text%2Fplain
+       * http://git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/utils/misc/ps_status.c;hb=HEAD
        */
 
       /* Loop around waiting for one or both of the other processes to
@@ -1011,6 +1031,7 @@ guestfs___print_timestamped_message (guestfs_h *g, const char *fs, ...)
   free (msg);
 }
 
+static int test_qemu_cmd (guestfs_h *g, const char *cmd, char **ret);
 static int read_all (guestfs_h *g, FILE *fp, char **ret);
 
 /* Test qemu binary (or wrapper) runs, and do 'qemu -help' and
@@ -1023,38 +1044,48 @@ test_qemu (guestfs_h *g)
   char cmd[1024];
   FILE *fp;
 
+  free (g->qemu_help);
+  g->qemu_help = NULL;
+  free (g->qemu_version);
+  g->qemu_version = NULL;
+
   snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -help", g->qemu);
 
-  fp = popen (cmd, "r");
   /* qemu -help should always work (qemu -version OTOH wasn't
    * supported by qemu 0.9).  If this command doesn't work then it
    * probably indicates that the qemu binary is missing.
    */
-  if (!fp) {
-    /* XXX This error is never printed, even if the qemu binary
-     * doesn't exist.  Why?
-     */
-  error:
+  if (test_qemu_cmd (g, cmd, &g->qemu_help) == -1) {
     perrorf (g, _("%s: command failed: If qemu is located on a non-standard path, try setting the LIBGUESTFS_QEMU environment variable."), cmd);
     return -1;
   }
 
-  if (read_all (g, fp, &g->qemu_help) == -1)
-    goto error;
-
-  if (pclose (fp) == -1)
-    goto error;
-
   snprintf (cmd, sizeof cmd, "LC_ALL=C '%s' -nographic -version 2>/dev/null",
             g->qemu);
 
+  /* Intentionally ignore errors from qemu -version. */
+  ignore_value (test_qemu_cmd (g, cmd, &g->qemu_version));
+
+  return 0;
+}
+
+static int
+test_qemu_cmd (guestfs_h *g, const char *cmd, char **ret)
+{
+  FILE *fp;
+
   fp = popen (cmd, "r");
-  if (fp) {
-    /* Intentionally ignore errors. */
-    read_all (g, fp, &g->qemu_version);
+  if (fp == NULL)
+    return -1;
+
+  if (read_all (g, fp, ret) == -1) {
     pclose (fp);
+    return -1;
   }
 
+  if (pclose (fp) != 0)
+    return -1;
+
   return 0;
 }