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[libvirt] [PATCH v2] bhyve: Add support for VNC autoport



From: Alexander Nusov <alexander nusov nfvexpress com>

This patch adds support for automatic VNC port assignment for bhyve guests.
---
Changes from v1:

 * Call virPortAllocatorRelease() in virBhyveProcessStop() to release
   VNC port; that's done unconditionally of using autoport
 * Call virPortAllocatorSetUsed(.., true) in virBhyveProcessReconnect()
   to reserve already used VNC ports after daemon restart
 * Call virPortAllocatorSetUsed(.., true) in bhyveBuildGraphicsArgStr()
   for domains that don't use autoport so allocator didn't try to use
   ports allocated by these domains
 * In dryRun mode (i.e. for domxml-to-native) don't allocate any ports
 * Add a couple of unit tests

Note 1: while adding tests I noticed that port allocator will actually
skip already bound ports, so I'm wondering if it makes any sense to use
virPortAllocatorSetUsed(.., true)? Right now I cannot come up with any
case to trigger this except probably some races when spawning guests
simultaneously, but that's hard to reproduce.
Note 2: there are still some cases where resources allocated during
command preparation are not properly cleaned up; that's not only VNC
ports, but also TAP devices. I plan to add proper cleanup routines
separately.


 src/bhyve/bhyve_command.c                          | 25 +++++++++++--
 src/bhyve/bhyve_driver.c                           |  5 +++
 src/bhyve/bhyve_process.c                          | 20 +++++++++++
 src/bhyve/bhyve_utils.h                            |  3 ++
 .../bhyvexml2argv-vnc-autoport.args                | 12 +++++++
 .../bhyvexml2argv-vnc-autoport.ldargs              |  1 +
 .../bhyvexml2argv-vnc-autoport.xml                 | 26 ++++++++++++++
 tests/bhyvexml2argvtest.c                          |  7 ++++
 .../bhyvexml2xmlout-vnc-autoport.xml               | 41 ++++++++++++++++++++++
 tests/bhyvexml2xmltest.c                           |  1 +
 10 files changed, 138 insertions(+), 3 deletions(-)
 create mode 100644 tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.args
 create mode 100644 tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.ldargs
 create mode 100644 tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.xml
 create mode 100644 tests/bhyvexml2xmloutdata/bhyvexml2xmlout-vnc-autoport.xml

diff --git a/src/bhyve/bhyve_command.c b/src/bhyve/bhyve_command.c
index eae5cb3ca..e62b5df66 100644
--- a/src/bhyve/bhyve_command.c
+++ b/src/bhyve/bhyve_command.c
@@ -330,15 +330,19 @@ bhyveBuildLPCArgStr(const virDomainDef *def ATTRIBUTE_UNUSED,
 }
 
 static int
-bhyveBuildGraphicsArgStr(const virDomainDef *def ATTRIBUTE_UNUSED,
+bhyveBuildGraphicsArgStr(const virDomainDef *def,
                          virDomainGraphicsDefPtr graphics,
                          virDomainVideoDefPtr video,
                          virConnectPtr conn,
-                         virCommandPtr cmd)
+                         virCommandPtr cmd,
+                         bool dryRun)
 {
     virBuffer opt = VIR_BUFFER_INITIALIZER;
     virDomainGraphicsListenDefPtr glisten = NULL;
     bool escapeAddr;
+    unsigned short port;
+
+    bhyveConnPtr driver = conn->privateData;
 
     if (!(bhyveDriverGetCaps(conn) & BHYVE_CAP_LPC_BOOTROM) ||
         def->os.bootloader ||
@@ -401,6 +405,20 @@ bhyveBuildGraphicsArgStr(const virDomainDef *def ATTRIBUTE_UNUSED,
                 virBufferAdd(&opt, glisten->address, -1);
         }
 
+        if (!dryRun) {
+            if (graphics->data.vnc.autoport) {
+                if (virPortAllocatorAcquire(driver->remotePorts, &port) < 0)
+                    return -1;
+                graphics->data.vnc.port = port;
+            } else {
+                if (virPortAllocatorSetUsed(driver->remotePorts,
+                                            graphics->data.vnc.port,
+                                            true) < 0)
+                    VIR_WARN("Failed to mark VNC port '%d' as used by '%s'",
+                             graphics->data.vnc.port, def->name);
+            }
+        }
+
         virBufferAsprintf(&opt, ":%d", graphics->data.vnc.port);
         break;
     default:
@@ -553,7 +571,8 @@ virBhyveProcessBuildBhyveCmd(virConnectPtr conn,
 
     if (def->ngraphics && def->nvideos) {
         if (def->ngraphics == 1 && def->nvideos == 1) {
-            if (bhyveBuildGraphicsArgStr(def, def->graphics[0], def->videos[0], conn, cmd) < 0)
+            if (bhyveBuildGraphicsArgStr(def, def->graphics[0], def->videos[0],
+                                         conn, cmd, dryRun) < 0)
                 goto error;
             add_lpc = true;
         } else {
diff --git a/src/bhyve/bhyve_driver.c b/src/bhyve/bhyve_driver.c
index ed2221a35..bffeea7d9 100644
--- a/src/bhyve/bhyve_driver.c
+++ b/src/bhyve/bhyve_driver.c
@@ -52,6 +52,7 @@
 #include "viraccessapicheck.h"
 #include "virhostcpu.h"
 #include "virhostmem.h"
+#include "virportallocator.h"
 #include "conf/domain_capabilities.h"
 
 #include "bhyve_conf.h"
@@ -1219,6 +1220,7 @@ bhyveStateCleanup(void)
     virObjectUnref(bhyve_driver->closeCallbacks);
     virObjectUnref(bhyve_driver->domainEventState);
     virObjectUnref(bhyve_driver->config);
+    virObjectUnref(bhyve_driver->remotePorts);
 
     virMutexDestroy(&bhyve_driver->lock);
     VIR_FREE(bhyve_driver);
@@ -1265,6 +1267,9 @@ bhyveStateInitialize(bool privileged,
     if (!(bhyve_driver->domainEventState = virObjectEventStateNew()))
         goto cleanup;
 
+    if (!(bhyve_driver->remotePorts = virPortAllocatorNew(_("display"), 5900, 65535, 0)))
+        goto cleanup;
+
     bhyve_driver->hostsysinfo = virSysinfoRead();
 
     if (!(bhyve_driver->config = virBhyveDriverConfigNew()))
diff --git a/src/bhyve/bhyve_process.c b/src/bhyve/bhyve_process.c
index a97e300ff..7211156ca 100644
--- a/src/bhyve/bhyve_process.c
+++ b/src/bhyve/bhyve_process.c
@@ -293,6 +293,16 @@ virBhyveProcessStop(bhyveConnPtr driver,
     /* Cleanup network interfaces */
     bhyveNetCleanup(vm);
 
+    /* VNC autoport cleanup */
+    if ((vm->def->ngraphics == 1) &&
+        vm->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC) {
+        if (virPortAllocatorRelease(driver->remotePorts,
+                                    vm->def->graphics[0]->data.vnc.port) < 0) {
+            VIR_WARN("Failed to release VNC port for '%s'",
+                     vm->def->name);
+        }
+    }
+
     ret = 0;
 
     virCloseCallbacksUnset(driver->closeCallbacks, vm,
@@ -412,6 +422,16 @@ virBhyveProcessReconnect(virDomainObjPtr vm,
          if (STREQ(expected_proctitle, proc_argv[0])) {
              ret = 0;
              priv->mon = bhyveMonitorOpen(vm, data->driver);
+             if (vm->def->ngraphics == 1 &&
+                 vm->def->graphics[0]->type == VIR_DOMAIN_GRAPHICS_TYPE_VNC) {
+                 int vnc_port = vm->def->graphics[0]->data.vnc.port;
+                 if (virPortAllocatorSetUsed(data->driver->remotePorts,
+                                             vnc_port,
+                                             true) < 0) {
+                     VIR_WARN("Failed to mark VNC port '%d' as used by '%s'",
+                              vnc_port, vm->def->name);
+                 }
+             }
          }
     }
 
diff --git a/src/bhyve/bhyve_utils.h b/src/bhyve/bhyve_utils.h
index db50e012a..8ad2698d4 100644
--- a/src/bhyve/bhyve_utils.h
+++ b/src/bhyve/bhyve_utils.h
@@ -28,6 +28,7 @@
 # include "virdomainobjlist.h"
 # include "virthread.h"
 # include "virclosecallbacks.h"
+# include "virportallocator.h"
 
 # define BHYVE_AUTOSTART_DIR    SYSCONFDIR "/libvirt/bhyve/autostart"
 # define BHYVE_CONFIG_DIR       SYSCONFDIR "/libvirt/bhyve"
@@ -58,6 +59,8 @@ struct _bhyveConn {
 
     virCloseCallbacksPtr closeCallbacks;
 
+    virPortAllocatorPtr remotePorts;
+
     unsigned bhyvecaps;
     unsigned grubcaps;
 };
diff --git a/tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.args b/tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.args
new file mode 100644
index 000000000..039526ff3
--- /dev/null
+++ b/tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.args
@@ -0,0 +1,12 @@
+/usr/sbin/bhyve \
+-c 1 \
+-m 214 \
+-u \
+-H \
+-P \
+-s 0:0,hostbridge \
+-l bootrom,/path/to/test.fd \
+-s 2:0,ahci,hd:/tmp/freebsd.img \
+-s 3:0,virtio-net,faketapdev,mac=52:54:00:00:00:00 \
+-s 4:0,fbuf,tcp=127.0.0.1:5900 \
+-s 1,lpc bhyve
diff --git a/tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.ldargs b/tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.ldargs
new file mode 100644
index 000000000..421376db9
--- /dev/null
+++ b/tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.ldargs
@@ -0,0 +1 @@
+dummy
diff --git a/tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.xml b/tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.xml
new file mode 100644
index 000000000..afb73f040
--- /dev/null
+++ b/tests/bhyvexml2argvdata/bhyvexml2argv-vnc-autoport.xml
@@ -0,0 +1,26 @@
+<domain type='bhyve'>
+  <name>bhyve</name>
+  <uuid>df3be7e7-a104-11e3-aeb0-50e5492bd3dc</uuid>
+  <memory>219136</memory>
+  <vcpu>1</vcpu>
+  <os>
+    <type>hvm</type>
+    <loader readonly="yes" type="pflash">/path/to/test.fd</loader>
+  </os>
+  <devices>
+    <disk type='file'>
+      <driver name='file' type='raw'/>
+      <source file='/tmp/freebsd.img'/>
+      <target dev='hda' bus='sata'/>
+      <address type='drive' controller='0' bus='0' target='2' unit='0'/>
+    </disk>
+    <interface type='bridge'>
+      <model type='virtio'/>
+      <source bridge="virbr0"/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </interface>
+    <graphics type='vnc' port='-1' autoport='yes'>
+      <listen type='address' address='127.0.0.1'/>
+    </graphics>
+  </devices>
+</domain>
diff --git a/tests/bhyvexml2argvtest.c b/tests/bhyvexml2argvtest.c
index c8f8c685a..95fada0bd 100644
--- a/tests/bhyvexml2argvtest.c
+++ b/tests/bhyvexml2argvtest.c
@@ -145,6 +145,11 @@ mymain(void)
     if ((driver.xmlopt = virBhyveDriverCreateXMLConf(&driver)) == NULL)
         return EXIT_FAILURE;
 
+    if (!(driver.remotePorts = virPortAllocatorNew("display", 5900, 65535,
+                                                   VIR_PORT_ALLOCATOR_SKIP_BIND_CHECK)))
+        return EXIT_FAILURE;
+
+
 # define DO_TEST_FULL(name, flags)                             \
     do {                                                       \
         static struct testInfo info = {                        \
@@ -193,6 +198,7 @@ mymain(void)
     DO_TEST("net-e1000");
     DO_TEST("uefi");
     DO_TEST("vnc");
+    DO_TEST("vnc-autoport");
 
     /* Address allocation tests */
     DO_TEST("addr-single-sata-disk");
@@ -231,6 +237,7 @@ mymain(void)
 
     virObjectUnref(driver.caps);
     virObjectUnref(driver.xmlopt);
+    virObjectUnref(driver.remotePorts);
 
     return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
 }
diff --git a/tests/bhyvexml2xmloutdata/bhyvexml2xmlout-vnc-autoport.xml b/tests/bhyvexml2xmloutdata/bhyvexml2xmlout-vnc-autoport.xml
new file mode 100644
index 000000000..d6cfe76b7
--- /dev/null
+++ b/tests/bhyvexml2xmloutdata/bhyvexml2xmlout-vnc-autoport.xml
@@ -0,0 +1,41 @@
+<domain type='bhyve'>
+  <name>bhyve</name>
+  <uuid>df3be7e7-a104-11e3-aeb0-50e5492bd3dc</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64'>hvm</type>
+    <loader readonly='yes' type='pflash'>/path/to/test.fd</loader>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <disk type='file' device='disk'>
+      <driver name='file' type='raw'/>
+      <source file='/tmp/freebsd.img'/>
+      <target dev='hda' bus='sata'/>
+      <address type='drive' controller='0' bus='0' target='2' unit='0'/>
+    </disk>
+    <controller type='pci' index='0' model='pci-root'/>
+    <controller type='sata' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+    </controller>
+    <interface type='bridge'>
+      <mac address='52:54:00:00:00:00'/>
+      <source bridge='virbr0'/>
+      <model type='virtio'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </interface>
+    <graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'>
+      <listen type='address' address='127.0.0.1'/>
+    </graphics>
+    <video>
+      <model type='gop' heads='1' primary='yes'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
+    </video>
+  </devices>
+</domain>
diff --git a/tests/bhyvexml2xmltest.c b/tests/bhyvexml2xmltest.c
index b3759919e..c16eb2b2c 100644
--- a/tests/bhyvexml2xmltest.c
+++ b/tests/bhyvexml2xmltest.c
@@ -105,6 +105,7 @@ mymain(void)
     DO_TEST_DIFFERENT("serial-grub");
     DO_TEST_DIFFERENT("serial-grub-nocons");
     DO_TEST_DIFFERENT("vnc");
+    DO_TEST_DIFFERENT("vnc-autoport");
 
     /* Address allocation tests */
     DO_TEST_DIFFERENT("addr-single-sata-disk");
-- 
2.13.1


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