[libvirt PATCH 1/2] qemu: add check for QEMU_CAPS_NETDEV_STREAM during validation

[Laine Stump]

In commit 5af6134e I had added a new capability that is true if QEMU
allows "-netdev stream", but somehow neglected to actually check it in
commit a56f0168d when hooking up passt support to qemu. This isn't
catastrophic, since QEMU itself will still report an error, but that
error isn't as easy to understand as a libvirt-generated error.

Fixes: a56f0168d576fa01cec204dc3c67d4d63ab8487f
Signed-off-by: Laine Stump <laine at redhat.com>
---
 src/qemu/qemu_validate.c                      |  6 ++
 .../net-user-passt.x86_64-latest.xml          | 61 +++++++++++++++++++
 tests/qemuxml2xmltest.c                       |  2 +-
 3 files changed, 68 insertions(+), 1 deletion(-)
 create mode 100644 tests/qemuxml2xmloutdata/net-user-passt.x86_64-latest.xml

diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
index 12055d5402..c877aa73d4 100644
--- a/src/qemu/qemu_validate.c
+++ b/src/qemu/qemu_validate.c
@@ -1837,6 +1837,12 @@ qemuValidateDomainDeviceDefNetwork(const virDomainNetDef *net,
     size_t i;
 
     if (net->type == VIR_DOMAIN_NET_TYPE_USER) {
+        if (net->backend.type == VIR_DOMAIN_NET_BACKEND_PASST &&
+            !virQEMUCapsGet(qemuCaps, QEMU_CAPS_NETDEV_STREAM)) {
+            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                           _("the passt network backend is not supported with this QEMU binary"));
+            return -1;
+        }
         if (net->guestIP.nroutes) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                            _("Invalid attempt to set network interface "
diff --git a/tests/qemuxml2xmloutdata/net-user-passt.x86_64-latest.xml b/tests/qemuxml2xmloutdata/net-user-passt.x86_64-latest.xml
new file mode 100644
index 0000000000..d7e0ef5f90
--- /dev/null
+++ b/tests/qemuxml2xmloutdata/net-user-passt.x86_64-latest.xml
@@ -0,0 +1,61 @@
+<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='x86_64' machine='pc'>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>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0' model='none'/>
+    <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='user'>
+      <mac address='00:11:22:33:44:55'/>
+      <source dev='eth42'/>
+      <ip address='172.17.2.0' family='ipv4' prefix='24'/>
+      <ip address='2001:db8:ac10:fd01::feed' family='ipv6'/>
+      <portForward proto='tcp' address='2001:db8:ac10:fd01::1:10'>
+        <range start='22' to='2022'/>
+        <range start='1000' end='1050'/>
+        <range start='1020' exclude='yes'/>
+        <range start='1030' end='1040' exclude='yes'/>
+      </portForward>
+      <portForward proto='udp' address='1.2.3.4' dev='eth0'>
+        <range start='5000' end='5020' to='6000'/>
+        <range start='5010' end='5015' exclude='yes'/>
+      </portForward>
+      <portForward proto='tcp'>
+        <range start='80'/>
+      </portForward>
+      <portForward proto='tcp'>
+        <range start='443' to='344'/>
+      </portForward>
+      <model type='rtl8139'/>
+      <backend type='passt' logFile='/var/log/loglaw.blog'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+    </interface>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <audio id='1' type='none'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>
diff --git a/tests/qemuxml2xmltest.c b/tests/qemuxml2xmltest.c
index 3a652dde61..2d2d800523 100644
--- a/tests/qemuxml2xmltest.c
+++ b/tests/qemuxml2xmltest.c
@@ -459,7 +459,7 @@ mymain(void)
     DO_TEST_NOCAPS("net-vhostuser");
     DO_TEST_NOCAPS("net-user");
     DO_TEST_NOCAPS("net-user-addr");
-    DO_TEST_NOCAPS("net-user-passt");
+    DO_TEST_CAPS_LATEST("net-user-passt");
     DO_TEST_NOCAPS("net-virtio");
     DO_TEST_NOCAPS("net-virtio-device");
     DO_TEST_NOCAPS("net-virtio-disable-offloads");
-- 
2.39.2