[PATCH v5 07/11] qemu: Introduce pr_helper to qemu.conf

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

Just like we allow users overriding path to bridge-helper
detected at compile time we can allow them to override path to
qemu-pr-helper.

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
Reviewed-by: John Ferlan <jferlan@xxxxxxxxxx>
---
 m4/virt-driver-qemu.m4             | 5 +++++
 src/qemu/libvirtd_qemu.aug         | 1 +
 src/qemu/qemu.conf                 | 4 ++++
 src/qemu/qemu_conf.c               | 7 ++++++-
 src/qemu/qemu_conf.h               | 1 +
 src/qemu/test_libvirtd_qemu.aug.in | 1 +
 6 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/m4/virt-driver-qemu.m4 b/m4/virt-driver-qemu.m4
index b9bafdab90..80e1d3ad46 100644
--- a/m4/virt-driver-qemu.m4
+++ b/m4/virt-driver-qemu.m4
@@ -57,6 +57,11 @@ AC_DEFUN([LIBVIRT_DRIVER_CHECK_QEMU], [
                [/usr/libexec:/usr/lib/qemu:/usr/lib])
   AC_DEFINE_UNQUOTED([QEMU_BRIDGE_HELPER], ["$QEMU_BRIDGE_HELPER"],
                      [QEMU bridge helper])
+  AC_PATH_PROG([QEMU_PR_HELPER], [qemu-pr-helper],
+               [/usr/bin/qemu-pr-helper],
+               [/usr/bin:/usr/libexec])
+  AC_DEFINE_UNQUOTED([QEMU_PR_HELPER], ["$QEMU_PR_HELPER"],
+                     [QEMU PR helper])
 ])
 
 AC_DEFUN([LIBVIRT_DRIVER_RESULT_QEMU], [
diff --git a/src/qemu/libvirtd_qemu.aug b/src/qemu/libvirtd_qemu.aug
index c19bf3a43a..2dc16e91fd 100644
--- a/src/qemu/libvirtd_qemu.aug
+++ b/src/qemu/libvirtd_qemu.aug
@@ -86,6 +86,7 @@ module Libvirtd_qemu =
    let process_entry = str_entry "hugetlbfs_mount"
                  | bool_entry "clear_emulator_capabilities"
                  | str_entry "bridge_helper"
+                 | str_entry "pr_helper"
                  | bool_entry "set_process_name"
                  | int_entry "max_processes"
                  | int_entry "max_files"
diff --git a/src/qemu/qemu.conf b/src/qemu/qemu.conf
index 34441857bd..31738ff19c 100644
--- a/src/qemu/qemu.conf
+++ b/src/qemu/qemu.conf
@@ -779,3 +779,7 @@
 # This directory is used for memoryBacking source if configured as file.
 # NOTE: big files will be stored here
 #memory_backing_dir = "/var/lib/libvirt/qemu/ram"
+
+# Path to the SCSI persistent reservations helper. This helper is
+# used whenever <reservations/> are enabled for SCSI LUN devices.
+#pr_helper = "/usr/bin/qemu-pr-helper"
diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index bfbb572f01..277ab833a8 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -302,7 +302,8 @@ virQEMUDriverConfigPtr virQEMUDriverConfigNew(bool privileged)
             goto error;
     }
 
-    if (VIR_STRDUP(cfg->bridgeHelperName, QEMU_BRIDGE_HELPER) < 0)
+    if (VIR_STRDUP(cfg->bridgeHelperName, QEMU_BRIDGE_HELPER) < 0 ||
+        VIR_STRDUP(cfg->prHelperName, QEMU_PR_HELPER) < 0)
         goto error;
 
     cfg->clearEmulatorCapabilities = true;
@@ -387,6 +388,7 @@ static void virQEMUDriverConfigDispose(void *obj)
     }
     VIR_FREE(cfg->hugetlbfs);
     VIR_FREE(cfg->bridgeHelperName);
+    VIR_FREE(cfg->prHelperName);
 
     VIR_FREE(cfg->saveImageFormat);
     VIR_FREE(cfg->dumpImageFormat);
@@ -754,6 +756,9 @@ int virQEMUDriverConfigLoadFile(virQEMUDriverConfigPtr cfg,
     if (virConfGetValueString(conf, "bridge_helper", &cfg->bridgeHelperName) < 0)
         goto cleanup;
 
+    if (virConfGetValueString(conf, "pr_helper", &cfg->prHelperName) < 0)
+        goto cleanup;
+
     if (virConfGetValueBool(conf, "mac_filter", &cfg->macFilter) < 0)
         goto cleanup;
 
diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h
index e1ad5463f3..7a63780c48 100644
--- a/src/qemu/qemu_conf.h
+++ b/src/qemu/qemu_conf.h
@@ -153,6 +153,7 @@ struct _virQEMUDriverConfig {
     size_t nhugetlbfs;
 
     char *bridgeHelperName;
+    char *prHelperName;
 
     bool macFilter;
 
diff --git a/src/qemu/test_libvirtd_qemu.aug.in b/src/qemu/test_libvirtd_qemu.aug.in
index 688e5b9fda..95885e9f06 100644
--- a/src/qemu/test_libvirtd_qemu.aug.in
+++ b/src/qemu/test_libvirtd_qemu.aug.in
@@ -100,3 +100,4 @@ module Test_libvirtd_qemu =
     { "1" = "mount" }
 }
 { "memory_backing_dir" = "/var/lib/libvirt/qemu/ram" }
+{ "pr_helper" = "/usr/bin/qemu-pr-helper" }
-- 
2.16.1

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