File: drvbhyve.html.in

package info (click to toggle)
libvirt 5.6.0-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 240,844 kB
  • sloc: ansic: 584,521; xml: 176,725; sh: 9,912; python: 4,731; perl: 4,343; makefile: 3,321; ml: 465
file content (493 lines) | stat: -rw-r--r-- 17,516 bytes parent folder | download | duplicates (3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
  <body>
    <h1>Bhyve driver</h1>

    <ul id="toc"></ul>

<p>
Bhyve is a FreeBSD hypervisor. It first appeared in FreeBSD 10.0. However, it's
recommended to keep tracking FreeBSD 10-STABLE to make sure all new features
of bhyve are supported.

In order to enable bhyve on your FreeBSD host, you'll need to load the <code>vmm</code>
kernel module. Additionally, <code>if_tap</code> and <code>if_bridge</code> modules
should be loaded for networking support. Also, <span class="since">since 3.2.0</span> the
<code>virt-host-validate(1)</code> supports the bhyve host validation and could be
used like this:
</p>

<pre>
$ virt-host-validate bhyve
 BHYVE: Checking for vmm module                                              : PASS
 BHYVE: Checking for if_tap module                                           : PASS
 BHYVE: Checking for if_bridge module                                        : PASS
 BHYVE: Checking for nmdm module                                             : PASS
$
</pre>

<p>
Additional information on bhyve could be obtained on <a href="http://bhyve.org/">bhyve.org</a>.
</p>

<h2><a id="uri">Connections to the Bhyve driver</a></h2>
<p>
The libvirt bhyve driver is a single-instance privileged driver. Some sample
connection URIs are:
</p>

<pre>
bhyve:///system                     (local access)
bhyve+unix:///system                (local access)
bhyve+ssh://root@example.com/system (remote access, SSH tunnelled)
</pre>

<h2><a id="exconfig">Example guest domain XML configurations</a></h2>

<h3>Example config</h3>
<p>
The bhyve driver in libvirt is in its early stage and under active development. So it supports
only limited number of features bhyve provides.
</p>

<p>
Note: in older libvirt versions, only a single network device and a single
disk device were supported per-domain. However,
<span class="since">since 1.2.6</span> the libvirt bhyve driver supports
up to 31 PCI devices.
</p>

<p>
Note: the Bhyve driver in libvirt will boot whichever device is first. If you
want to install from CD, put the CD device first. If not, put the root HDD
first.
</p>

<p>
Note: Only the SATA bus is supported. Only <code>cdrom</code>- and
<code>disk</code>-type disks are supported.
</p>

<pre>
&lt;domain type='bhyve'&gt;
    &lt;name&gt;bhyve&lt;/name&gt;
    &lt;uuid&gt;df3be7e7-a104-11e3-aeb0-50e5492bd3dc&lt;/uuid&gt;
    &lt;memory&gt;219136&lt;/memory&gt;
    &lt;currentMemory&gt;219136&lt;/currentMemory&gt;
    &lt;vcpu&gt;1&lt;/vcpu&gt;
    &lt;os&gt;
       &lt;type&gt;hvm&lt;/type&gt;
    &lt;/os&gt;
    &lt;features&gt;
      &lt;apic/&gt;
      &lt;acpi/&gt;
    &lt;/features&gt;
    &lt;clock offset='utc'/&gt;
    &lt;on_poweroff&gt;destroy&lt;/on_poweroff&gt;
    &lt;on_reboot&gt;restart&lt;/on_reboot&gt;
    &lt;on_crash&gt;destroy&lt;/on_crash&gt;
    &lt;devices&gt;
      &lt;disk type='file'&gt;
        &lt;driver name='file' type='raw'/&gt;
        &lt;source file='/path/to/bhyve_freebsd.img'/&gt;
        &lt;target dev='hda' bus='sata'/&gt;
      &lt;/disk&gt;
      &lt;disk type='file' device='cdrom'&gt;
        &lt;driver name='file' type='raw'/&gt;
        &lt;source file='/path/to/cdrom.iso'/&gt;
        &lt;target dev='hdc' bus='sata'/&gt;
        &lt;readonly/&gt;
      &lt;/disk&gt;
      &lt;interface type='bridge'&gt;
        &lt;model type='virtio'/&gt;
        &lt;source bridge="virbr0"/&gt;
      &lt;/interface&gt;
    &lt;/devices&gt;
&lt;/domain&gt;
</pre>

<p>(The &lt;disk&gt; sections may be swapped in order to install from
<em>cdrom.iso</em>.)</p>

<h3>Example config (Linux guest)</h3>

<p>
Note the addition of &lt;bootloader&gt;.
</p>

<pre>
&lt;domain type='bhyve'&gt;
    &lt;name&gt;linux_guest&lt;/name&gt;
    &lt;uuid&gt;df3be7e7-a104-11e3-aeb0-50e5492bd3dc&lt;/uuid&gt;
    &lt;memory&gt;131072&lt;/memory&gt;
    &lt;currentMemory&gt;131072&lt;/currentMemory&gt;
    &lt;vcpu&gt;1&lt;/vcpu&gt;
    &lt;bootloader&gt;/usr/local/sbin/grub-bhyve&lt;/bootloader&gt;
    &lt;os&gt;
       &lt;type&gt;hvm&lt;/type&gt;
    &lt;/os&gt;
    &lt;features&gt;
      &lt;apic/&gt;
      &lt;acpi/&gt;
    &lt;/features&gt;
    &lt;clock offset='utc'/&gt;
    &lt;on_poweroff&gt;destroy&lt;/on_poweroff&gt;
    &lt;on_reboot&gt;restart&lt;/on_reboot&gt;
    &lt;on_crash&gt;destroy&lt;/on_crash&gt;
    &lt;devices&gt;
      &lt;disk type='file' device='disk'&gt;
        &lt;driver name='file' type='raw'/&gt;
        &lt;source file='/path/to/guest_hdd.img'/&gt;
        &lt;target dev='hda' bus='sata'/&gt;
      &lt;/disk&gt;
      &lt;disk type='file' device='cdrom'&gt;
        &lt;driver name='file' type='raw'/&gt;
        &lt;source file='/path/to/cdrom.iso'/&gt;
        &lt;target dev='hdc' bus='sata'/&gt;
        &lt;readonly/&gt;
      &lt;/disk&gt;
      &lt;interface type='bridge'&gt;
        &lt;model type='virtio'/&gt;
        &lt;source bridge="virbr0"/&gt;
      &lt;/interface&gt;
    &lt;/devices&gt;
&lt;/domain&gt;
</pre>

<h3>Example config (Linux UEFI guest, VNC, tablet)</h3>

<p>This is an example to boot into Fedora 25 installation:</p>

<pre>
&lt;domain type='bhyve'&gt;
    &lt;name&gt;fedora_uefi_vnc_tablet&lt;/name&gt;
    &lt;memory unit='G'&gt;4&lt;/memory&gt;
    &lt;vcpu&gt;2&lt;/vcpu&gt;
    &lt;os&gt;
       &lt;type&gt;hvm&lt;/type&gt;
       <b>&lt;loader readonly=&quot;yes&quot; type=&quot;pflash&quot;&gt;/usr/local/share/uefi-firmware/BHYVE_UEFI.fd&lt;/loader&gt;</b>
    &lt;/os&gt;
    &lt;features&gt;
      &lt;apic/&gt;
      &lt;acpi/&gt;
    &lt;/features&gt;
    &lt;clock offset='utc'/&gt;
    &lt;on_poweroff&gt;destroy&lt;/on_poweroff&gt;
    &lt;on_reboot&gt;restart&lt;/on_reboot&gt;
    &lt;on_crash&gt;destroy&lt;/on_crash&gt;
    &lt;devices&gt;
      &lt;disk type='file' device='cdrom'&gt;
        &lt;driver name='file' type='raw'/&gt;
          &lt;source file='/path/to/Fedora-Workstation-Live-x86_64-25-1.3.iso'/&gt;
        &lt;target dev='hdc' bus='sata'/&gt;
        &lt;readonly/&gt;
      &lt;/disk&gt;
      &lt;disk type='file' device='disk'&gt;
        &lt;driver name='file' type='raw'/&gt;
        &lt;source file='/path/to/linux_uefi.img'/&gt;
        &lt;target dev='hda' bus='sata'/&gt;
        &lt;/disk&gt;
      &lt;interface type='bridge'&gt;
        &lt;model type='virtio'/&gt;
        &lt;source bridge=&quot;virbr0&quot;/&gt;
      &lt;/interface&gt;
      &lt;serial type=&quot;nmdm&quot;&gt;
        &lt;source master=&quot;/dev/nmdm0A&quot; slave=&quot;/dev/nmdm0B&quot;/&gt;
      &lt;/serial&gt;
      <b>&lt;graphics type='vnc' port='5904'&gt;
        &lt;listen type='address' address='127.0.0.1'/&gt;
      &lt;/graphics&gt;
      &lt;controller type='usb' model='nec-xhci'/&gt;
      &lt;input type='tablet' bus='usb'/&gt;</b>
    &lt;/devices&gt;
&lt;/domain&gt;
</pre>

<p>Please refer to the <a href="#uefi">UEFI</a> section for a more detailed explanation.</p>

<h2><a id="usage">Guest usage / management</a></h2>

<h3><a id="console">Connecting to a guest console</a></h3>

<p>
Guest console connection is supported through the <code>nmdm</code> device. It could be enabled by adding
the following to the domain XML (<span class="since">Since 1.2.4</span>):
</p>

<pre>
...
&lt;devices&gt;
  &lt;serial type="nmdm"&gt;
    &lt;source master="/dev/nmdm0A" slave="/dev/nmdm0B"/&gt;
  &lt;/serial&gt;
&lt;/devices&gt;
...</pre>


<p>Make sure to load the <code>nmdm</code> kernel module if you plan to use that.</p>

<p>
Then <code>virsh console</code> command can be used to connect to the text console
of a guest.</p>

<p><b>NB:</b> Some versions of bhyve have a bug that prevents guests from booting
until the console is opened by a client. This bug was fixed in FreeBSD
<a href="http://svnweb.freebsd.org/changeset/base/262884">r262884</a>. If
an older version is used, one either has to open a console manually with <code>virsh console</code>
to let a guest boot or start a guest using:</p>

<pre>start --console domname</pre>

<p><b>NB:</b> A bootloader configured to require user interaction will prevent
the domain from starting (and thus <code>virsh console</code> or <code>start
--console</code> from functioning) until the user interacts with it manually on
the VM host. Because users typically do not have access to the VM host,
interactive bootloaders are unsupported by libvirt. <em>However,</em> if you happen to
run into this scenario and also happen to have access to the Bhyve host
machine, you may select a boot option and allow the domain to finish starting
by using an alternative terminal client on the VM host to connect to the
domain-configured null modem device. One example (assuming
<code>/dev/nmdm0B</code> is configured as the slave end of the domain serial
device) is:</p>

<pre>cu -l /dev/nmdm0B</pre>

<h3><a id="xmltonative">Converting from domain XML to Bhyve args</a></h3>

<p>
The <code>virsh domxml-to-native</code> command can preview the actual
<code>bhyve</code> commands that will be executed for a given domain.
It outputs two lines, the first line is a <code>bhyveload</code> command and
the second is a <code>bhyve</code> command.
</p>

<p>Please note that the <code>virsh domxml-to-native</code> doesn't do any
real actions other than printing the command, for example, it doesn't try to
find a proper TAP interface and create it, like what is done when starting
a domain; and always returns <code>tap0</code> for the network interface. So
if you're going to run these commands manually, most likely you might want to
tweak them.</p>

<pre>
# virsh -c "bhyve:///system"  domxml-to-native --format bhyve-argv --xml /path/to/bhyve.xml
/usr/sbin/bhyveload -m 214 -d /home/user/vm1.img vm1
/usr/sbin/bhyve -c 2 -m 214 -A -I -H -P -s 0:0,hostbridge -s 3:0,virtio-net,tap0,mac=52:54:00:5d:74:e3 -s 2:0,virtio-blk,/home/user/vm1.img -s 1,lpc -l com1,/dev/nmdm0A vm1
</pre>

<h3><a id="zfsvolume">Using ZFS volumes</a></h3>

<p>It's possible to use ZFS volumes as disk devices <span class="since">since 1.2.8</span>.
An example of domain XML device entry for that will look like:</p>

<pre>
...
&lt;disk type='volume' device='disk'&gt;
  &lt;source pool='zfspool' volume='vol1'/&gt;
  &lt;target dev='vdb' bus='virtio'/&gt;
&lt;/disk&gt;
...</pre>

<p>Please refer to the <a href="storage.html">Storage documentation</a> for more details on storage
management.</p>

<h3><a id="grubbhyve">Using grub2-bhyve or Alternative Bootloaders</a></h3>

<p>It's possible to boot non-FreeBSD guests by specifying an explicit
bootloader, e.g. <code>grub-bhyve(1)</code>. Arguments to the bootloader may be
specified as well. If the bootloader is <code>grub-bhyve</code> and arguments
are omitted, libvirt will try and infer boot ordering from user-supplied
&lt;boot order='N'&gt; configuration in the domain. Failing that, it will boot
the first disk in the domain (either <code>cdrom</code>- or
<code>disk</code>-type devices). If the disk type is <code>disk</code>, it will
attempt to boot from the first partition in the disk image.</p>

<pre>
...
&lt;bootloader&gt;/usr/local/sbin/grub-bhyve&lt;/bootloader&gt;
&lt;bootloader_args&gt;...&lt;/bootloader_args&gt;
...
</pre>

<p>Caveat: <code>bootloader_args</code> does not support any quoting.
Filenames, etc, must not have spaces or they will be tokenized incorrectly.</p>

<h3><a id="uefi">Using UEFI bootrom, VNC, and USB tablet</a></h3>

<p><span class="since">Since 3.2.0</span>, in addition to <a href="#grubbhyve">grub-bhyve</a>,
non-FreeBSD guests could be also booted using an UEFI boot ROM, provided both guest OS and
installed <code>bhyve(1)</code> version support UEFI. To use that, <code>loader</code>
should be specified in the <code>os</code> section:</p>

<pre>
&lt;domain type='bhyve'&gt;
    ...
    &lt;os&gt;
       &lt;type&gt;hvm&lt;/type&gt;
       &lt;loader readonly="yes" type="pflash"&gt;/usr/local/share/uefi-firmware/BHYVE_UEFI.fd&lt;/loader&gt;
    &lt;/os&gt;
    ...
</pre>

<p>This uses the UEFI firmware provided by
the <a href="https://www.freshports.org/sysutils/bhyve-firmware/">sysutils/bhyve-firmware</a>
FreeBSD port.</p>

<p>VNC and the tablet input device could be configured this way:</p>

<pre>
&lt;domain type='bhyve'&gt;
    &lt;devices&gt;
      ...
      &lt;graphics type='vnc' port='5904'&gt;
        &lt;listen type='address' address='127.0.0.1'/&gt;
      &lt;/graphics&gt;
      &lt;controller type='usb' model='nec-xhci'/&gt;
      &lt;input type='tablet' bus='usb'/&gt;
    &lt;/devices&gt;
    ...
&lt;/domain&gt;
</pre>

<p>This way, VNC will be accessible on <code>127.0.0.1:5904</code>.</p>

<p>Please note that the tablet device requires to have a USB controller
of the <code>nec-xhci</code> model. Currently, only a single controller of this
type and a single tablet are supported per domain.</p>

<p><span class="since">Since 3.5.0</span>, it's possible to configure how the video device is exposed
to the guest using the <code>vgaconf</code> attribute:</p>

<pre>
&lt;domain type='bhyve'&gt;
    &lt;devices&gt;
    ...
      &lt;graphics type='vnc' port='5904'&gt;
        &lt;listen type='address' address='127.0.0.1'/&gt;
      &lt;/graphics&gt;
      &lt;video&gt;
        &lt;driver vgaconf='on'/&gt;
        &lt;model type='gop' heads='1' primary='yes'/&gt;
      &lt;/video&gt;
      ...
    &lt;/devices&gt;
    ...
&lt;/domain&gt;
</pre>

<p>If not specified, bhyve's default mode for <code>vgaconf</code>
will be used. Please refer to the
<a href="https://www.freebsd.org/cgi/man.cgi?query=bhyve&amp;sektion=8&amp;manpath=FreeBSD+12-current">bhyve(8)</a>
manual page and the <a href="https://wiki.freebsd.org/bhyve">bhyve wiki</a> for more details on using
the <code>vgaconf</code> option.</p>

<p><span class="since">Since 3.7.0</span>, it's possible to use <code>autoport</code>
to let libvirt allocate VNC port automatically (instead of explicitly specifying
it with the <code>port</code> attribute):</p>

<pre>
    &lt;graphics type='vnc' autoport='yes'&gt;
</pre>

<h3><a id="clockconfig">Clock configuration</a></h3>

<p>Originally bhyve supported only localtime for RTC. Support for UTC time was introduced in
<a href="http://svnweb.freebsd.org/changeset/base/284894">r284894</a> for <i>10-STABLE</i> and
in <a href="http://svnweb.freebsd.org/changeset/base/279225">r279225</a> for <i>-CURRENT</i>.
It's possible to use this in libvirt <span class="since">since 1.2.18</span>, just place the
following to domain XML:</p>

<pre>
&lt;domain type="bhyve"&gt;
    ...
    &lt;clock offset='utc'/&gt;
    ...
&lt;/domain&gt;
</pre>

<p>Please note that if you run the older bhyve version that doesn't support UTC time, you'll
fail to start a domain. As UTC is used as a default when you do not specify clock settings,
you'll need to explicitly specify 'localtime' in this case:</p>

<pre>
&lt;domain type="bhyve"&gt;
    ...
    &lt;clock offset='localtime'/&gt;
    ...
&lt;/domain&gt;
</pre>

<h3><a id="e1000">e1000 NIC</a></h3>

<p>As of <a href="https://svnweb.freebsd.org/changeset/base/302504">r302504</a> bhyve
supports Intel e1000 network adapter emulation. It's supported in libvirt
<span class="since">since 3.1.0</span> and could be used as follows:</p>

<pre>
...
    &lt;interface type='bridge'&gt;
      &lt;source bridge='virbr0'/&gt;
      &lt;model type='<b>e1000</b>'/&gt;
    &lt;/interface&gt;
...
</pre>

<h3><a id="wired">Wiring guest memory</a></h3>

<p><span class="since">Since 4.4.0</span>, it's possible to specify that guest memory should
be wired and cannot be swapped out as follows:</p>
<pre>
&lt;domain type="bhyve"&gt;
    ...
    &lt;memoryBacking&gt;
      &lt;locked/&gt;
    &lt;/memoryBacking&gt;
    ...
&lt;/domain&gt;
</pre>

<h3><a id="cputopology">CPU topology</a></h3>

<p><span class="since">Since 4.5.0</span>, it's possible to specify guest CPU topology, if bhyve
supports that. Support for specifying guest CPU topology was added to bhyve in
<a href="http://svnweb.freebsd.org/changeset/base/332298">r332298</a> for <i>-CURRENT</i>.
Example:</p>
<pre>
&lt;domain type="bhyve"&gt;
    ...
    &lt;cpu&gt;
      &lt;topology sockets='1' cores='2' threads='1'/&gt;
    &lt;/cpu&gt;
    ...
&lt;/domain&gt;
</pre>

<h3><a id="bhyvecommand">Pass-through of arbitrary bhyve commands</a></h3>

<p><span class="since">Since 5.1.0</span>, it's possible to pass additional command-line
arguments to the bhyve process when starting the domain using the
<code>&lt;bhyve:commandline&gt;</code> element under <code>domain</code>.
To supply an argument, use the element <code>&lt;bhyve:arg&gt;</code> with
the attribute <code>value</code> set to additional argument to be added.
The arg element may be repeated multiple times. To use this XML addition, it is necessary
to issue an XML namespace request (the special <code>xmlns:<i>name</i></code> attribute)
that pulls in <code>http://libvirt.org/schemas/domain/bhyve/1.0</code>;
typically, the namespace is given the name of <code>bhyve</code>.
</p>
<p>Example:</p>
<pre>
&lt;domain type="bhyve" xmlns:bhyve="http://libvirt.org/schemas/domain/bhyve/1.0"&gt;
  ...
  &lt;bhyve:commandline&gt;
    &lt;bhyve:arg value='-somebhyvearg'/&gt;
  &lt;/bhyve:commandline&gt;
&lt;/domain&gt;
</pre>

<p>Note that these extensions are for testing and development purposes only.
They are <b>unsupported</b>, using them may result in inconsistent state,
and upgrading either bhyve or libvirtd maybe break behavior of a domain that
was relying on a specific commands pass-through.</p>

  </body>
</html>