modules: load modules from versioned /var/run dir

On upgrades the old .so files usually are replaced. But on the other
hand since a qemu process represents a guest instance it is usually kept
around.

That makes late addition of dynamic features e.g. 'hot-attach of a ceph
disk' fail by trying to load a new version of e.f. block-rbd.so into an
old still running qemu binary.

This adds a fallback to also load modules from a versioned directory in the
temporary /var/run path. That way qemu is providing a way for packaging
to store modules of an upgraded qemu package as needed until the next reboot.

An example how that can then be used in packaging can be seen in:
https://git.launchpad.net/~paelzer/ubuntu/+source/qemu/log/?h=bug-1847361-miss-old-so-on-upgrade-UBUNTU

Fixes: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1847361
Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200310145806.18335-2-christian.ehrhardt@canonical.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/configure b/configure
index 1a8268303b402043db63f14545b2ad011ab17724..a7f2c3edd8d3f1b14f10f44a60e541b4e1f3037c 100755 (executable)
--- a/configure
+++ b/configure
@@ -405,6 +405,7 @@ EXESUF=""
 DSOSUF=".so"
 LDFLAGS_SHARED="-shared"
 modules="no"
+module_upgrades="no"
 prefix="/usr/local"
 mandir="\${prefix}/share/man"
 datadir="\${prefix}/share"
@@ -1032,6 +1033,10 @@ for opt do
   --disable-modules)
       modules="no"
   ;;
+  --disable-module-upgrades) module_upgrades="no"
+  ;;
+  --enable-module-upgrades) module_upgrades="yes"
+  ;;
   --cpu=*)
   ;;
   --target-list=*) target_list="$optarg"
@@ -1791,6 +1796,7 @@ disabled with --disable-FEATURE, default is enabled if available:
   guest-agent-msi build guest agent Windows MSI installation package
   pie             Position Independent Executables
   modules         modules support (non-Windows)
+  module-upgrades try to load modules from alternate paths for upgrades
   debug-tcg       TCG debugging (default is disabled)
   debug-info      debugging information
   sparse          sparse checker
@@ -2055,6 +2061,11 @@ if test "$modules" = "yes" && test "$mingw32" = "yes" ; then
   error_exit "Modules are not available for Windows"
 fi
 
+# module_upgrades is only reasonable if modules are enabled
+if test "$modules" = "no" && test "$module_upgrades" = "yes" ; then
+  error_exit "Can't enable module-upgrades as Modules are not enabled"
+fi
+
 # Static linking is not possible with modules or PIE
 if test "$static" = "yes" ; then
   if test "$modules" = "yes" ; then
@@ -6626,6 +6637,7 @@ if test "$slirp" != "no" ; then
     echo "smbd              $smbd"
 fi
 echo "module support    $modules"
+echo "alt path mod load $module_upgrades"
 echo "host CPU          $cpu"
 echo "host big endian   $bigendian"
 echo "target list       $target_list"
@@ -6980,6 +6992,9 @@ if test "$modules" = "yes"; then
   echo "CONFIG_STAMP=_$( (echo $qemu_version; echo $pkgversion; cat $0) | $shacmd - | cut -f1 -d\ )" >> $config_host_mak
   echo "CONFIG_MODULES=y" >> $config_host_mak
 fi
+if test "$module_upgrades" = "yes"; then
+  echo "CONFIG_MODULE_UPGRADES=y" >> $config_host_mak
+fi
 if test "$have_x11" = "yes" && test "$need_x11" = "yes"; then
   echo "CONFIG_X11=y" >> $config_host_mak
   echo "X11_CFLAGS=$x11_cflags" >> $config_host_mak

diff --git a/util/module.c b/util/module.c
index 236a7bb52adf4e2378baf7446bfc41e402193778..5f7896870a3c644da6a4c6b3d2f46f3ebca2c83f 100644 (file)
--- a/util/module.c
+++ b/util/module.c
@@ -19,6 +19,9 @@
 #endif
 #include "qemu/queue.h"
 #include "qemu/module.h"
+#ifdef CONFIG_MODULE_UPGRADES
+#include "qemu-version.h"
+#endif
 
 typedef struct ModuleEntry
 {
@@ -170,6 +173,9 @@ bool module_load_one(const char *prefix, const char *lib_name)
 #ifdef CONFIG_MODULES
     char *fname = NULL;
     char *exec_dir;
+#ifdef CONFIG_MODULE_UPGRADES
+    char *version_dir;
+#endif
     const char *search_dir;
     char *dirs[4];
     char *module_name;
@@ -201,6 +207,14 @@ bool module_load_one(const char *prefix, const char *lib_name)
     dirs[n_dirs++] = g_strdup_printf("%s", CONFIG_QEMU_MODDIR);
     dirs[n_dirs++] = g_strdup_printf("%s/..", exec_dir ? : "");
     dirs[n_dirs++] = g_strdup_printf("%s", exec_dir ? : "");
+
+#ifdef CONFIG_MODULE_UPGRADES
+    version_dir = g_strcanon(g_strdup(QEMU_PKGVERSION),
+                             G_CSET_A_2_Z G_CSET_a_2_z G_CSET_DIGITS "+-.~",
+                             '_');
+    dirs[n_dirs++] = g_strdup_printf("/var/run/qemu/%s", version_dir);
+#endif
+
     assert(n_dirs <= ARRAY_SIZE(dirs));
 
     g_free(exec_dir);