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diff --git a/share/man/man4/vmm.4 b/share/man/man4/vmm.4
--- a/share/man/man4/vmm.4
+++ b/share/man/man4/vmm.4
@@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd December 19, 2013
+.Dd October 12, 2023
.Dt VMM 4
.Os
.Sh NAME
@@ -79,6 +79,16 @@
and
.Va pptdevs3
variables can be used for additional entries.
+.Sh LOADER TUNABLES
+Tunables can be set at the
+.Xr loader 8
+prompt before booting the kernel or stored in
+.Xr loader.conf 5 .
+.Bl -tag -width indent
+.It Va hw.vmm.maxcpu
+Maximum number of virtual CPUs.
+The default is the number of physical CPUs in the system.
+.El
.Sh EXAMPLES
Reserve three PCI devices for use by the hypervisor: bus 10 slot 0 function 0,
bus 6 slot 5 function 0, and bus 6 slot 5 function 1.
diff --git a/usr.sbin/bhyve/bhyve.8 b/usr.sbin/bhyve/bhyve.8
--- a/usr.sbin/bhyve/bhyve.8
+++ b/usr.sbin/bhyve/bhyve.8
@@ -22,7 +22,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd October 9, 2023
+.Dd October 12, 2023
.Dt BHYVE 8
.Os
.Sh NAME
@@ -129,7 +129,6 @@
and
.Ar threads
is 1.
-The current maximum number of guest virtual CPUs is 16.
If
.Ar numcpus
is not specified then it will be calculated from the other arguments.
@@ -143,6 +142,15 @@
If a
.Ar setting
is specified more than once the last one has precedence.
+.Pp
+The maximum number of virtual CPUs defaults to the number of active
+physical CPUs in the system available via the
+.Va hw.vmm.maxcpu
+.Xr sysctl 8
+variable.
+The limit can be adjusted via the
+.Va hw.vmm.maxcpu
+loader tunable.
.It Fl D
Destroy the VM on guest initiated power-off.
.It Fl e

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