qemuxmlconftest: (consistently) use real FDs in tests for VDPA netdevs

Use virTestMakeDummyFD() to get a real FD for the test in
qemuxmlconftest.

Use virTestMakeDummyFD() also in qemuhotplugmock.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

tests/qemuhotplugmock.c

@@ -26,6 +26,8 @@
 #include "virdevmapper.h"
 #include <fcntl.h>
 
+#include "testutils.h"
+
 #define LIBVIRT_QEMU_MONITOR_PRIV_H_ALLOW
 #include "qemu/qemu_monitor_priv.h"
 
@@ -71,10 +73,9 @@ qemuProcessKillManagedPRDaemon(virDomainObj *vm G_GNUC_UNUSED)
 }
 
 int
-qemuVDPAConnect(const char *devicepath G_GNUC_UNUSED)
+qemuVDPAConnect(const char *devicepath)
 {
-    /* need a valid fd or sendmsg won't work. Just open /dev/null */
-    return open("/dev/null", O_RDONLY);
+    return virTestMakeDummyFD(g_strdup_printf("@vdpa-%s-fd@", devicepath));
 }
 
 

tests/qemuxml2argvmock.c

@@ -266,11 +266,9 @@ virNetDevBandwidthSetRootQDisc(const char *ifname G_GNUC_UNUSED,
 
 
 int
-qemuVDPAConnect(const char *devicepath G_GNUC_UNUSED)
+qemuVDPAConnect(const char *devicepath)
 {
-    if (fcntl(1732, F_GETFD) != -1)
-        abort();
-    return 1732;
+    return virTestMakeDummyFD(g_strdup_printf("@vdpa-%s-fd@", devicepath));
 }
 
 char *

tests/qemuxmlconfdata/net-vdpa-multiqueue.x86_64-latest.args

@@ -27,7 +27,7 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
 -no-shutdown \
 -boot strict=on \
 -device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \
--add-fd set=0,fd=XXXXXXX,opaque=net0-vdpa \
+-add-fd set=0,fd=@vdpa-/dev/vhost-vdpa-0-fd@,opaque=net0-vdpa \
 -netdev '{"type":"vhost-vdpa","vhostdev":"/dev/fdset/0","queues":2,"id":"hostnet0"}' \
 -device '{"driver":"virtio-net-pci","mq":true,"vectors":6,"netdev":"hostnet0","id":"net0","mac":"52:54:00:95:db:c0","bus":"pci.0","addr":"0x2"}' \
 -audiodev '{"id":"audio1","driver":"none"}' \

tests/qemuxmlconfdata/net-vdpa.x86_64-latest.args

@@ -27,7 +27,7 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
 -no-shutdown \
 -boot strict=on \
 -device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \
--add-fd set=0,fd=XXXXXXX,opaque=net0-vdpa \
+-add-fd set=0,fd=@vdpa-/dev/vhost-vdpa-0-fd@,opaque=net0-vdpa \
 -netdev '{"type":"vhost-vdpa","vhostdev":"/dev/fdset/0","id":"hostnet0"}' \
 -device '{"driver":"virtio-net-pci","netdev":"hostnet0","id":"net0","mac":"52:54:00:95:db:c0","bus":"pci.0","addr":"0x2"}' \
 -audiodev '{"id":"audio1","driver":"none"}' \