conf: correct false boot order error during domain parse

virDomainDefCollectBootOrder() is called for every item on the list
for each type of device. One of the checks it makes is to gather the
order attributes from the <boot> element of all devices, and assure
that no two devices have been given the same order.

Since (internally to libvirt, *not* in the domain XML) an <interface
type='hostdev'> is on both the list of hostdev devices and the list of
network devices, it will be counted twice, and the code that checks
for multiple devices with the same boot order will give a false
positive.

To remedy this, we make sure to return early for hostdev devices that
have a parent.type != NONE.

This was introduced in commit 5b75a4, which was first in libvirt-4.4.0.

Resolves: https://bugzilla.redhat.com/1601318

Signed-off-by: Laine Stump <laine@laine.org>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/conf/domain_conf.c

@@ -5016,6 +5016,14 @@ virDomainDefCollectBootOrder(virDomainDefPtr def ATTRIBUTE_UNUSED,
     if (info->bootIndex == 0)
         return 0;
 
+    if (dev->type == VIR_DOMAIN_DEVICE_HOSTDEV &&
+        dev->data.hostdev->parent.type != VIR_DOMAIN_DEVICE_NONE) {
+        /* This hostdev is a child of a higher level device
+         * (e.g. interface), and thus already being counted on the
+         * list for the other device type.
+         */
+        return 0;
+    }
     if (virAsprintf(&order, "%u", info->bootIndex) < 0)
         goto cleanup;
 

tests/qemuxml2argvdata/net-hostdev-bootorder.args

@@ -0,0 +1,27 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/home/test \
+USER=test \
+LOGNAME=test \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i686 \
+-name QEMUGuest1 \
+-S \
+-machine pc,accel=tcg,usb=off,dump-guest-core=off \
+-m 214 \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,path=/tmp/lib/domain--1-QEMUGuest1/monitor.sock,\
+server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-usb \
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
+-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,\
+bootindex=2 \
+-device pci-assign,host=03:07.1,id=hostdev0,bootindex=1,bus=pci.0,addr=0x3

tests/qemuxml2argvdata/net-hostdev-bootorder.xml

@@ -0,0 +1,36 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+  </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-i686</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+      <boot order='2'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='ide' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <interface type='hostdev' managed='yes'>
+      <mac address='00:11:22:33:44:55'/>
+      <source>
+        <address type='pci' domain='0x0000' bus='0x03' slot='0x07' function='0x1'/>
+      </source>
+      <boot order='1'/>
+    </interface>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -1376,6 +1376,7 @@ mymain(void)
     DO_TEST("net-mcast", NONE);
     DO_TEST("net-udp", NONE);
     DO_TEST("net-hostdev", NONE);
+    DO_TEST("net-hostdev-bootorder", NONE);
     DO_TEST("net-hostdev-multidomain", NONE);
     DO_TEST("net-hostdev-vfio",
             QEMU_CAPS_DEVICE_VFIO_PCI);

tests/qemuxml2xmloutdata/net-hostdev-bootorder.xml

@@ -0,0 +1,42 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='i686' machine='pc'>hvm</type>
+  </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-i686</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <boot order='2'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+    </controller>
+    <controller type='ide' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <interface type='hostdev' managed='yes'>
+      <mac address='00:11:22:33:44:55'/>
+      <source>
+        <address type='pci' domain='0x0000' bus='0x03' slot='0x07' function='0x1'/>
+      </source>
+      <boot order='1'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </interface>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>

tests/qemuxml2xmltest.c

@@ -433,6 +433,7 @@ mymain(void)
     DO_TEST("net-virtio-network-portgroup", NONE);
     DO_TEST("net-virtio-rxtxqueuesize", NONE);
     DO_TEST("net-hostdev", NONE);
+    DO_TEST("net-hostdev-bootorder", NONE);
     DO_TEST("net-hostdev-vfio", NONE);
     DO_TEST("net-midonet", NONE);
     DO_TEST("net-openvswitch", NONE);