virsh: Add iothread to 'attach-disk'

Add an iothread parameter to allow attaching to an IOThread, such as:

virsh attach-disk $dom $source $target --live --config --iothread 2 \
     --targetbus virtio --driver qemu --subdriver raw  --type disk

tools/virsh-domain.c

@@ -311,6 +311,10 @@ static const vshCmdOptDef opts_attach_disk[] = {
      .type = VSH_OT_STRING,
      .help = N_("subdriver of disk device")
     },
+    {.name = "iothread",
+     .type = VSH_OT_STRING,
+     .help = N_("IOThread to be used by supported device")
+    },
     {.name = "cache",
      .type = VSH_OT_STRING,
      .help = N_("cache mode of disk device")
@@ -527,8 +531,8 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
     virDomainPtr dom = NULL;
     const char *source = NULL, *target = NULL, *driver = NULL,
                 *subdriver = NULL, *type = NULL, *mode = NULL,
-                *cache = NULL, *serial = NULL, *straddr = NULL,
-                *wwn = NULL, *targetbus = NULL;
+                *iothread = NULL, *cache = NULL, *serial = NULL,
+                *straddr = NULL, *wwn = NULL, *targetbus = NULL;
     struct DiskAddress diskAddr;
     bool isFile = false, functionReturn = false;
     int ret;
@@ -558,6 +562,7 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
         vshCommandOptStringReq(ctl, cmd, "subdriver", &subdriver) < 0 ||
         vshCommandOptStringReq(ctl, cmd, "type", &type) < 0 ||
         vshCommandOptStringReq(ctl, cmd, "mode", &mode) < 0 ||
+        vshCommandOptStringReq(ctl, cmd, "iothread", &iothread) < 0 ||
         vshCommandOptStringReq(ctl, cmd, "cache", &cache) < 0 ||
         vshCommandOptStringReq(ctl, cmd, "serial", &serial) < 0 ||
         vshCommandOptStringReq(ctl, cmd, "wwn", &wwn) < 0 ||
@@ -601,13 +606,15 @@ cmdAttachDisk(vshControl *ctl, const vshCmd *cmd)
     virBufferAddLit(&buf, ">\n");
     virBufferAdjustIndent(&buf, 2);
 
-    if (driver || subdriver || cache) {
+    if (driver || subdriver || iothread || cache) {
         virBufferAddLit(&buf, "<driver");
 
         if (driver)
             virBufferAsprintf(&buf, " name='%s'", driver);
         if (subdriver)
             virBufferAsprintf(&buf, " type='%s'", subdriver);
+        if (iothread)
+            virBufferAsprintf(&buf, " iothread='%s'", iothread);
         if (cache)
             virBufferAsprintf(&buf, " cache='%s'", cache);
 

tools/virsh.pod

@@ -2240,7 +2240,8 @@ expected.
 
 =item B<attach-disk> I<domain> I<source> I<target> [[[I<--live>] [I<--config>]
 | [I<--current>]] | [I<--persistent>]] [I<--targetbus bus>] [I<--driver
-driver>] [I<--subdriver subdriver>] [I<--cache cache>] [I<--type type>]
+driver>] [I<--subdriver subdriver>] [I<--iothread iothread>]
+[I<--cache cache>] [I<--type type>]
 [I<--mode mode>] [I<--sourcetype sourcetype>] [I<--serial serial>] [I<--wwn
 wwn>] [I<--rawio>] [I<--address address>] [I<--multifunction>] [I<--print-xml>]
 
@@ -2267,6 +2268,8 @@ I<mode> can specify the two specific mode I<readonly> or I<shareable>.
 I<sourcetype> can indicate the type of source (block|file)
 I<cache> can be one of "default", "none", "writethrough", "writeback",
 "directsync" or "unsafe".
+I<iothread> is the number within the range of domain IOThreads to which
+this disk may be attached (QEMU only).
 I<serial> is the serial of disk device. I<wwn> is the wwn of disk device.
 I<rawio> indicates the disk needs rawio capability.
 I<address> is the address of disk device in the form of pci:domain.bus.slot.function,