qemu-extdevice: prepare, start and stop slirp-helper

If a slirp-helper is associated with a network interface,
prepare/start/stop the process via qemu-extdevice.
Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_extdevice.c

@@ -23,6 +23,7 @@
 #include "qemu_extdevice.h"
 #include "qemu_domain.h"
 #include "qemu_tpm.h"
+#include "qemu_slirp.h"
 
 #include "viralloc.h"
 #include "virlog.h"
@@ -87,14 +88,24 @@ qemuExtDevicesInitPaths(virQEMUDriverPtr driver,
  */
 int
 qemuExtDevicesPrepareHost(virQEMUDriverPtr driver,
-                          virDomainDefPtr def)
+                          virDomainObjPtr vm)
 {
-    int ret = 0;
+    virDomainDefPtr def = vm->def;
+    size_t i;
 
-    if (def->tpm)
-        ret = qemuExtTPMPrepareHost(driver, def);
+    if (def->tpm &&
+        qemuExtTPMPrepareHost(driver, def) < 0)
+        return -1;
 
-    return ret;
+    for (i = 0; i < def->nnets; i++) {
+        virDomainNetDefPtr net = def->nets[i];
+        qemuSlirpPtr slirp = QEMU_DOMAIN_NETWORK_PRIVATE(net)->slirp;
+
+        if (slirp && qemuSlirpOpen(slirp, driver, def) < 0)
+            return -1;
+    }
+
+    return 0;
 }
 
 
@@ -115,7 +126,9 @@ qemuExtDevicesStart(virQEMUDriverPtr driver,
                     virDomainObjPtr vm,
                     bool incomingMigration)
 {
+    virDomainDefPtr def = vm->def;
     int ret = 0;
+    size_t i;
 
     if (qemuExtDevicesInitPaths(driver, vm->def) < 0)
         return -1;
@@ -123,6 +136,15 @@ qemuExtDevicesStart(virQEMUDriverPtr driver,
     if (vm->def->tpm)
         ret = qemuExtTPMStart(driver, vm, incomingMigration);
 
+    for (i = 0; i < def->nnets; i++) {
+        virDomainNetDefPtr net = def->nets[i];
+        qemuSlirpPtr slirp = QEMU_DOMAIN_NETWORK_PRIVATE(net)->slirp;
+
+        if (slirp &&
+            qemuSlirpStart(slirp, vm, driver, net, false, incomingMigration) < 0)
+            return -1;
+    }
+
     return ret;
 }
 
@@ -131,11 +153,22 @@ void
 qemuExtDevicesStop(virQEMUDriverPtr driver,
                    virDomainObjPtr vm)
 {
+    virDomainDefPtr def = vm->def;
+    size_t i;
+
     if (qemuExtDevicesInitPaths(driver, vm->def) < 0)
         return;
 
     if (vm->def->tpm)
         qemuExtTPMStop(driver, vm);
+
+    for (i = 0; i < def->nnets; i++) {
+        virDomainNetDefPtr net = def->nets[i];
+        qemuSlirpPtr slirp = QEMU_DOMAIN_NETWORK_PRIVATE(net)->slirp;
+
+        if (slirp)
+            qemuSlirpStop(slirp, vm, driver, net, false);
+    }
 }
 
 

src/qemu/qemu_extdevice.h

@@ -31,7 +31,7 @@ int qemuExtDeviceLogCommand(virQEMUDriverPtr driver,
     ATTRIBUTE_RETURN_CHECK;
 
 int qemuExtDevicesPrepareHost(virQEMUDriverPtr driver,
-                              virDomainDefPtr def)
+                              virDomainObjPtr vm)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2)
     ATTRIBUTE_RETURN_CHECK;
 

src/qemu/qemu_process.c

@@ -6619,7 +6619,7 @@ qemuProcessPrepareHost(virQEMUDriverPtr driver,
         goto cleanup;
 
     VIR_DEBUG("Preparing external devices");
-    if (qemuExtDevicesPrepareHost(driver, vm->def) < 0)
+    if (qemuExtDevicesPrepareHost(driver, vm) < 0)
         goto cleanup;
 
     if (qemuProcessPrepareSEVGuestInput(vm) < 0)