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bhyve: Add CPU topology support

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Recently, bhyve started supporting specifying guest CPU topology.
It looks this way:

  bhyve -c cpus=C,sockets=S,cores=C,threads=T ...

The old behaviour was bhyve -c C, where C is a number of vCPUs, is
still supported.

So if we have CPU topology in the domain XML, use the new syntax,
otherwise keep the old behaviour.

Also, document this feature in the bhyve driver page.

Signed-off-by: Roman Bogorodskiy <bogorodskiy@gmail.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
This commit is contained in:
Roman Bogorodskiy 2018-05-21 18:53:36 +04:00
parent 922c867f06
commit b66fda0a74
5 changed files with 55 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
docs/drvbhyve.html.in
View File

@ -444,6 +444,22 @@ be wired and cannot be swapped out as follows:</p>
&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>
</body>

6
src/bhyve/bhyve_capabilities.c
View File

@ -244,6 +244,12 @@ bhyveProbeCapsFromHelp(unsigned int *caps, char *binary)
if (strstr(help, "-u:") != NULL)
*caps |= BHYVE_CAP_RTC_UTC;
/* "-c vcpus" was there before CPU topology support was introduced,
* then it became
* "-c [[cpus=]numcpus][,sockets=n][,cores=n][,threads=n] */
if (strstr(help, "-c vcpus") == NULL)
*caps |= BHYVE_CAP_CPUTOPOLOGY;
out:
VIR_FREE(help);
virCommandFree(cmd);

1
src/bhyve/bhyve_capabilities.h
View File

@ -49,6 +49,7 @@ typedef enum {
BHYVE_CAP_LPC_BOOTROM = 1 << 3,
BHYVE_CAP_FBUF = 1 << 4,
BHYVE_CAP_XHCI = 1 << 5,
BHYVE_CAP_CPUTOPOLOGY = 1 << 6,
} virBhyveCapsFlags;
int virBhyveProbeGrubCaps(virBhyveGrubCapsFlags *caps);

26
src/bhyve/bhyve_command.c
View File

@ -462,12 +462,36 @@ virBhyveProcessBuildBhyveCmd(virConnectPtr conn,
size_t i;
bool add_lpc = false;
int nusbcontrollers = 0;
unsigned int nvcpus = virDomainDefGetVcpus(def);
virCommandPtr cmd = virCommandNew(BHYVE);
/* CPUs */
virCommandAddArg(cmd, "-c");
virCommandAddArgFormat(cmd, "%d", virDomainDefGetVcpus(def));
if (def->cpu && def->cpu->sockets) {
if (nvcpus != def->cpu->sockets * def->cpu->cores * def->cpu->threads) {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Invalid CPU topology: total number of vCPUs "
"must equal the product of sockets, cores, "
"and threads"));
goto error;
}
if ((bhyveDriverGetCaps(conn) & BHYVE_CAP_CPUTOPOLOGY) != 0) {
virCommandAddArgFormat(cmd, "cpus=%d,sockets=%d,cores=%d,threads=%d",
nvcpus,
def->cpu->sockets,
def->cpu->cores,
def->cpu->threads);
} else {
virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
_("Installed bhyve binary does not support "
"defining CPU topology"));
goto error;
}
} else {
virCommandAddArgFormat(cmd, "%d", nvcpus);
}
/* Memory */
virCommandAddArg(cmd, "-m");

8
tests/bhyvexml2argvtest.c
View File

@ -176,7 +176,8 @@ mymain(void)
driver.grubcaps = BHYVE_GRUB_CAP_CONSDEV;
driver.bhyvecaps = BHYVE_CAP_RTC_UTC | BHYVE_CAP_AHCI32SLOT | \
BHYVE_CAP_NET_E1000 | BHYVE_CAP_LPC_BOOTROM | \
BHYVE_CAP_FBUF | BHYVE_CAP_XHCI;
BHYVE_CAP_FBUF | BHYVE_CAP_XHCI | \
BHYVE_CAP_CPUTOPOLOGY;
DO_TEST("base");
DO_TEST("wired");
@ -207,6 +208,8 @@ mymain(void)
DO_TEST("vnc-vgaconf-off");
DO_TEST("vnc-vgaconf-io");
DO_TEST("vnc-autoport");
DO_TEST("cputopology");
DO_TEST_FAILURE("cputopology-nvcpu-mismatch");
/* Address allocation tests */
DO_TEST("addr-single-sata-disk");
@ -243,6 +246,9 @@ mymain(void)
driver.bhyvecaps &= ~BHYVE_CAP_FBUF;
DO_TEST_FAILURE("vnc");
driver.bhyvecaps &= ~BHYVE_CAP_CPUTOPOLOGY;
DO_TEST_FAILURE("cputopology");
virObjectUnref(driver.caps);
virObjectUnref(driver.xmlopt);
virPortAllocatorRangeFree(driver.remotePorts);