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[libvirt] [RFC 10/12] RFC: Don't append 0 at usb id, so that it is compatible with legacy -usb



QEMU uses USB bus name "usb.0" when using the legacy -usb argument.
If we want to allow USB devices to specify their addresses with legacy
-usb, we should either in case of legacy bus name drop the 0 from the
address bus, or just drop the 0 from device id. This patch does the
later.

Another solution would be to permit addressing on non-legacy USB
controllers only.
---
 src/qemu/qemu_command.c                            |   21 +++++++++++++++----
 .../qemuxml2argv-usb-ich9-companion.args           |    8 +++---
 .../qemuxml2argv-usb-ich9-ehci-addr.args           |    2 +-
 .../qemuxml2argv-usb-piix3-controller.args         |    2 +-
 4 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index d25f34f..c424ec1 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1288,6 +1288,14 @@ error:
     return -1;
 }
 
+static void
+qemuUsbId(virBufferPtr buf, int idx)
+{
+    if (idx == 0)
+        virBufferAsprintf(buf, "usb");
+    else
+        virBufferAsprintf(buf, "usb%d", idx);
+}
 
 static int
 qemuBuildDeviceAddressStr(virBufferPtr buf,
@@ -1337,8 +1345,9 @@ qemuBuildDeviceAddressStr(virBufferPtr buf,
         else
             virBufferAsprintf(buf, ",addr=0x%x", info->addr.pci.slot);
     } else if (info->type == VIR_DOMAIN_DEVICE_ADDRESS_TYPE_USB) {
-        virBufferAsprintf(buf, ",bus=usb%d.0", info->addr.usb.bus);
-        virBufferAsprintf(buf, ",port=%s", info->addr.usb.port);
+        virBufferAsprintf(buf, ",bus=");
+        qemuUsbId(buf, info->addr.usb.bus);
+        virBufferAsprintf(buf, ".0,port=%s", info->addr.usb.port);
     }
 
     return 0;
@@ -1768,11 +1777,13 @@ qemuBuildUSBControllerDevStr(virDomainControllerDefPtr def,
         return -1;
     }
 
-    virBufferAsprintf(buf, "%s,id=usb%d", smodel, def->idx);
+    virBufferAsprintf(buf, "%s,id=", smodel);
+    qemuUsbId(buf, def->idx);
 
     if (def->info.mastertype == VIR_DOMAIN_CONTROLLER_MASTER_USB) {
-        virBufferAsprintf(buf, ",masterbus=usb%d.0,firstport=%d",
-                          def->info.master.usb.bus, def->info.master.usb.startport);
+        virBufferAsprintf(buf, ",masterbus=");
+        qemuUsbId(buf, def->info.master.usb.bus);
+        virBufferAsprintf(buf, ".0,firstport=%d", def->info.master.usb.startport);
     }
 
     return 0;
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-usb-ich9-companion.args b/tests/qemuxml2argvdata/qemuxml2argv-usb-ich9-companion.args
index d5a2e08..80ca5ce 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-usb-ich9-companion.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-usb-ich9-companion.args
@@ -1,6 +1,6 @@
 LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/tmp/test-monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=readline -no-acpi -boot c \
--device ich9-usb-ehci1,id=usb0,bus=pci.0,multifunction=on,addr=0x4.0x7 \
--device ich9-usb-uhci1,id=usb1,masterbus=usb0.0,firstport=0,bus=pci.0,multifunction=on,addr=0x4.0x0 \
--device ich9-usb-uhci2,id=usb2,masterbus=usb0.0,firstport=2,bus=pci.0,multifunction=on,addr=0x4.0x1 \
--device ich9-usb-uhci3,id=usb3,masterbus=usb0.0,firstport=4,bus=pci.0,multifunction=on,addr=0x4.0x2 \
+-device ich9-usb-ehci1,id=usb,bus=pci.0,multifunction=on,addr=0x4.0x7 \
+-device ich9-usb-uhci1,id=usb1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x4.0x0 \
+-device ich9-usb-uhci2,id=usb2,masterbus=usb.0,firstport=2,bus=pci.0,multifunction=on,addr=0x4.0x1 \
+-device ich9-usb-uhci3,id=usb3,masterbus=usb.0,firstport=4,bus=pci.0,multifunction=on,addr=0x4.0x2 \
 -device virtio-balloon-pci,id=balloon0,bus=pci.0,multifunction=on,addr=0x3.0x0
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-usb-ich9-ehci-addr.args b/tests/qemuxml2argvdata/qemuxml2argv-usb-ich9-ehci-addr.args
index 502244d..0059ab5 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-usb-ich9-ehci-addr.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-usb-ich9-ehci-addr.args
@@ -1 +1 @@
-LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/tmp/test-monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=readline -no-acpi -boot c -device ich9-usb-ehci1,id=usb0,bus=pci.0,multifunction=on,addr=0x4.0x7 -device virtio-balloon-pci,id=balloon0,bus=pci.0,multifunction=on,addr=0x3.0x0
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/tmp/test-monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=readline -no-acpi -boot c -device ich9-usb-ehci1,id=usb,bus=pci.0,multifunction=on,addr=0x4.0x7 -device virtio-balloon-pci,id=balloon0,bus=pci.0,multifunction=on,addr=0x3.0x0
diff --git a/tests/qemuxml2argvdata/qemuxml2argv-usb-piix3-controller.args b/tests/qemuxml2argvdata/qemuxml2argv-usb-piix3-controller.args
index 799b75f..c4573ea 100644
--- a/tests/qemuxml2argvdata/qemuxml2argv-usb-piix3-controller.args
+++ b/tests/qemuxml2argvdata/qemuxml2argv-usb-piix3-controller.args
@@ -1 +1 @@
-LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/tmp/test-monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=readline -no-acpi -boot c -device piix3-usb-uhci,id=usb0,bus=pci.0,addr=0x3 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
+LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu -S -M pc -m 214 -smp 1 -nographic -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/tmp/test-monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=readline -no-acpi -boot c -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x3 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
-- 
1.7.6


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