tests: Add usb-controller-automatic-unavailable-q35

For q35 guests, we normally add a USB controller by default,
but there's a scenario in which we can decide to skip it. Add
test coverage for it.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>

tests/qemuxmlconfdata/usb-controller-automatic-unavailable-q35.x86_64-latest.args

@@ -0,0 +1,33 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/var/lib/libvirt/qemu/domain--1-q35-test \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/var/lib/libvirt/qemu/domain--1-q35-test/.local/share \
+XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain--1-q35-test/.cache \
+XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-q35-test/.config \
+/usr/bin/qemu-system-x86_64 \
+-name guest=q35-test,debug-threads=on \
+-S \
+-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-q35-test/master-key.aes"}' \
+-machine q35,usb=off,dump-guest-core=off,memory-backend=pc.ram,acpi=off \
+-accel tcg \
+-cpu qemu64 \
+-m size=2097152k \
+-object '{"qom-type":"memory-backend-ram","id":"pc.ram","size":2147483648}' \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid 11dbdcdd-4c3b-482b-8903-9bdb8c0a2774 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-audiodev '{"id":"audio1","driver":"none"}' \
+-global ICH9-LPC.noreboot=off \
+-watchdog-action reset \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-msg timestamp=on

tests/qemuxmlconfdata/usb-controller-automatic-unavailable-q35.x86_64-latest.xml

@@ -0,0 +1,30 @@
+<domain type='qemu'>
+  <name>q35-test</name>
+  <uuid>11dbdcdd-4c3b-482b-8903-9bdb8c0a2774</uuid>
+  <memory unit='KiB'>2097152</memory>
+  <currentMemory unit='KiB'>2097152</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='q35'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <cpu mode='custom' match='exact' check='none'>
+    <model fallback='forbid'>qemu64</model>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>
+    <controller type='pci' index='0' model='pcie-root'/>
+    <controller type='sata' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
+    </controller>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <audio id='1' type='none'/>
+    <watchdog model='itco' action='reset'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxmlconfdata/usb-controller-automatic-unavailable-q35.xml

@@ -0,0 +1,20 @@
+<domain type='qemu'>
+  <name>q35-test</name>
+  <uuid>11dbdcdd-4c3b-482b-8903-9bdb8c0a2774</uuid>
+  <memory unit='KiB'>2097152</memory>
+  <currentMemory unit='KiB'>2097152</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='q35'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>
+    <controller type='pci' index='0' model='pcie-root'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxmlconftest.c

@@ -1822,12 +1822,21 @@ mymain(void)
                  ARG_CAPS_VER, "latest",
                  ARG_QEMU_CAPS_DEL, QEMU_CAPS_PIIX3_USB_UHCI, QEMU_CAPS_LAST,
                  ARG_END);
+    /* q35 fails instead */
     DO_TEST_FULL("usb-controller-default-unavailable-q35", ".x86_64-latest",
                  ARG_CAPS_ARCH, "x86_64",
                  ARG_CAPS_VER, "latest",
                  ARG_FLAGS, FLAG_EXPECT_FAILURE,
                  ARG_QEMU_CAPS_DEL, QEMU_CAPS_PIIX3_USB_UHCI, QEMU_CAPS_LAST,
                  ARG_END);
+    /* However, if the USB controller is the one that gets added
+     * automatically for every guest instead of one that the user has
+     * explicitly asked for, we prefer simply skipping it */
+    DO_TEST_FULL("usb-controller-automatic-unavailable-q35", ".x86_64-latest",
+                 ARG_CAPS_ARCH, "x86_64",
+                 ARG_CAPS_VER, "latest",
+                 ARG_QEMU_CAPS_DEL, QEMU_CAPS_DEVICE_QEMU_XHCI, QEMU_CAPS_NEC_USB_XHCI, QEMU_CAPS_ICH9_USB_EHCI1, QEMU_CAPS_LAST,
+                 ARG_END);
 
     DO_TEST_CAPS_LATEST("usb-none");