[PATCH v4 1/2] Add USB option capability

[Li Zhang <zhlcindy@xxxxxxxxx>]

From: Li Zhang <zhlcindy@xxxxxxxxxxxxxxxxxx>

To avoid the collision for creating USB controllers in machine->init()
and -device xx command line, it needs to set usb=off to avoid one USB
controller created in machine->init(). So that libvirt can use -device
or -usb to create USB controller sucessfully.
So QEMU_CAPS_MACHINE_USB_OPT capability is added, and it is for QEMU
v1.3.0 onwards which supports USB option.

Signed-off-by: Li Zhang <zhlcindy@xxxxxxxxxxxxxxxxxx>
---
 v4 -> v3:
   * Add one new test case for USB option
   * Rebase it with latest version

 v3 -> v2:
   * Set QEMU_CAPS_MACHINE_USB_OPT with help string

 v2 -> v1:
   * Rename QEMU_CAPS_USB_OPT to QEMU_CAPS_MACHINE_USB_OPT suggested by Daniel
   * Corret QEMU version with v1.3.0 suggested by Daniel

 src/qemu/qemu_capabilities.c | 9 +++++++++
 src/qemu/qemu_capabilities.h | 1 +
 src/qemu/qemu_command.c      | 6 ++++++
 3 files changed, 16 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 50712b0..07cda1f 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -216,6 +216,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
 
               "ipv6-migration", /* 135 */
               "machine-opt",
+              "machine-usb-opt",
     );
 
 struct _virQEMUCaps {
@@ -1078,6 +1079,10 @@ virQEMUCapsComputeCmdFlags(const char *help,
     if (strstr(help, "-machine"))
         virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_OPT);
 
+     /* USB option is supported v1.3.0 onwards */
+    if (qemuCaps->version >= 1003000)
+        virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_USB_OPT);
+
     /*
      * Handling of -incoming arg with varying features
      *  -incoming tcp    (kvm >= 79, qemu >= 0.10.0)
@@ -2435,6 +2440,10 @@ virQEMUCapsInitQMP(virQEMUCapsPtr qemuCaps,
 
     virQEMUCapsInitQMPBasic(qemuCaps);
 
+    /* USB option is supported v1.3.0 onwards */
+    if (qemuCaps->version >= 1003000)
+        virQEMUCapsSet(qemuCaps, QEMU_CAPS_MACHINE_USB_OPT);
+
     if (!(archstr = qemuMonitorGetTargetArch(mon)))
         goto cleanup;
 
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index b2dc588..9f24d6a 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -176,6 +176,7 @@ enum virQEMUCapsFlags {
     QEMU_CAPS_SCSI_MEGASAS       = 134, /* -device megasas */
     QEMU_CAPS_IPV6_MIGRATION     = 135, /* -incoming [::] */
     QEMU_CAPS_MACHINE_OPT        = 136, /* -machine xxxx*/
+    QEMU_CAPS_MACHINE_USB_OPT    = 137, /* -machine xxx,usb=on/off */
 
     QEMU_CAPS_LAST,                   /* this must always be the last item */
 };
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 53caba5..d051056 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -5234,6 +5234,12 @@ qemuBuildMachineArgStr(virCommandPtr cmd,
         virCommandAddArg(cmd, "-machine");
         virBufferAdd(&buf, def->os.machine, -1);
 
+        /* To avoid the collision of creating USB controllers when calling
+         * machine->init in QEMU, it needs to set usb=off
+         */
+        if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_MACHINE_USB_OPT))
+            virBufferAsprintf(&buf, ",usb=off");
+
         if (def->mem.dump_core) {
             if (!virQEMUCapsGet(qemuCaps, QEMU_CAPS_DUMP_GUEST_CORE)) {
                 virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
-- 
1.8.1.4

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