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diff --git a/sys/dev/kvm_clock/kvm_clock.c b/sys/dev/kvm_clock/kvm_clock.c
--- a/sys/dev/kvm_clock/kvm_clock.c
+++ b/sys/dev/kvm_clock/kvm_clock.c
@@ -46,6 +46,7 @@
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/smp.h>
+#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/pmap.h>
@@ -77,6 +78,7 @@
static struct pvclock_wall_clock *kvm_clock_get_wallclock(void *arg);
static void kvm_clock_system_time_enable(struct kvm_clock_softc *sc);
static void kvm_clock_system_time_enable_pcpu(void *arg);
+static void kvm_clock_setup_sysctl(device_t);
static struct pvclock_wall_clock *
kvm_clock_get_wallclock(void *arg)
@@ -166,6 +168,7 @@
sc->pvc.timeinfos = sc->timeinfos;
sc->pvc.stable_flag_supported = stable_flag_supported;
pvclock_init(&sc->pvc, dev, KVM_CLOCK_DEVNAME, KVM_CLOCK_TC_QUALITY, 0);
+ kvm_clock_setup_sysctl(dev);
return (0);
}
@@ -217,6 +220,29 @@
return (0);
}
+static int
+kvm_clock_tsc_freq_sysctl(SYSCTL_HANDLER_ARGS)
+{
+ struct kvm_clock_softc *sc = oidp->oid_arg1;
+ uint64_t freq = pvclock_tsc_freq(sc->timeinfos);
+
+ return (sysctl_handle_64(oidp, &freq, 0, req));
+}
+
+static void
+kvm_clock_setup_sysctl(device_t dev)
+{
+ struct kvm_clock_softc *sc = device_get_softc(dev);
+ struct sysctl_ctx_list *ctx = device_get_sysctl_ctx(dev);
+ struct sysctl_oid *tree = device_get_sysctl_tree(dev);
+ struct sysctl_oid_list *child = SYSCTL_CHILDREN(tree);
+
+ SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "tsc_freq",
+ CTLTYPE_U64 | CTLFLAG_RD | CTLFLAG_MPSAFE, sc, 0,
+ kvm_clock_tsc_freq_sysctl, "QU",
+ "Time Stamp Counter frequency");
+}
+
static device_method_t kvm_clock_methods[] = {
DEVMETHOD(device_identify, kvm_clock_identify),
DEVMETHOD(device_probe, kvm_clock_probe),

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