diff options
| -rw-r--r-- | sys/dev/hyperv/vmbus/hv_hv.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/dev/hyperv/vmbus/hv_hv.c b/sys/dev/hyperv/vmbus/hv_hv.c index 289b577..c499f18 100644 --- a/sys/dev/hyperv/vmbus/hv_hv.c +++ b/sys/dev/hyperv/vmbus/hv_hv.c @@ -390,11 +390,14 @@ SYSINIT(hypercall_ctor, SI_SUB_DRIVERS, SI_ORDER_FIRST, hypercall_create, NULL); static void hypercall_destroy(void *arg __unused) { + uint64_t hc; + if (hypercall_context.hc_addr == NULL) return; /* Disable Hypercall */ - wrmsr(MSR_HV_HYPERCALL, 0); + hc = rdmsr(MSR_HV_HYPERCALL); + wrmsr(MSR_HV_HYPERCALL, (hc & MSR_HV_HYPERCALL_RSVD_MASK)); hypercall_memfree(); if (bootverbose) |
