Index: head/sys/amd64/vmm/amd/amdvi_hw.c
===================================================================
--- head/sys/amd64/vmm/amd/amdvi_hw.c
+++ head/sys/amd64/vmm/amd/amdvi_hw.c
@@ -58,7 +58,8 @@
 #include "amdvi_priv.h"
 
 SYSCTL_DECL(_hw_vmm);
-SYSCTL_NODE(_hw_vmm, OID_AUTO, amdvi, CTLFLAG_RW, NULL, NULL);
+SYSCTL_NODE(_hw_vmm, OID_AUTO, amdvi, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
+    NULL);
 
 #define MOD_INC(a, s, m) (((a) + (s)) % ((m) * (s)))
 #define MOD_DEC(a, s, m) (((a) - (s)) % ((m) * (s)))
@@ -947,16 +948,16 @@
 	SYSCTL_ADD_U16(ctx, child, OID_AUTO, "end_dev_rid", CTLFLAG_RD,
 	    &softc->end_dev_rid, 0, "End of device under this IOMMU");
 	SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "command_head",
-	    CTLTYPE_UINT | CTLFLAG_RD, softc, 0,
+	    CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, softc, 0,
 	    amdvi_handle_sysctl, "IU", "Command head");
 	SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "command_tail",
-	    CTLTYPE_UINT | CTLFLAG_RD, softc, 1,
+	    CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, softc, 1,
 	    amdvi_handle_sysctl, "IU", "Command tail");
 	SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "event_head",
-	    CTLTYPE_UINT | CTLFLAG_RD, softc, 2,
+	    CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, softc, 2,
 	    amdvi_handle_sysctl, "IU", "Command head");
 	SYSCTL_ADD_PROC(ctx, child, OID_AUTO, "event_tail",
-	    CTLTYPE_UINT | CTLFLAG_RD, softc, 3,
+	    CTLTYPE_UINT | CTLFLAG_RD | CTLFLAG_MPSAFE, softc, 3,
 	    amdvi_handle_sysctl, "IU", "Command tail");
 }
 
Index: head/sys/amd64/vmm/amd/npt.c
===================================================================
--- head/sys/amd64/vmm/amd/npt.c
+++ head/sys/amd64/vmm/amd/npt.c
@@ -41,7 +41,8 @@
 #include "npt.h"
 
 SYSCTL_DECL(_hw_vmm);
-SYSCTL_NODE(_hw_vmm, OID_AUTO, npt, CTLFLAG_RW, NULL, NULL);
+SYSCTL_NODE(_hw_vmm, OID_AUTO, npt, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
+    NULL);
 
 static int npt_flags;
 SYSCTL_INT(_hw_vmm_npt, OID_AUTO, pmap_flags, CTLFLAG_RD,
Index: head/sys/amd64/vmm/amd/svm.c
===================================================================
--- head/sys/amd64/vmm/amd/svm.c
+++ head/sys/amd64/vmm/amd/svm.c
@@ -67,7 +67,8 @@
 #include "npt.h"
 
 SYSCTL_DECL(_hw_vmm);
-SYSCTL_NODE(_hw_vmm, OID_AUTO, svm, CTLFLAG_RW, NULL, NULL);
+SYSCTL_NODE(_hw_vmm, OID_AUTO, svm, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
+    NULL);
 
 /*
  * SVM CPUID function 0x8000_000A, edx bit decoding.
Index: head/sys/amd64/vmm/intel/ept.c
===================================================================
--- head/sys/amd64/vmm/intel/ept.c
+++ head/sys/amd64/vmm/intel/ept.c
@@ -68,7 +68,8 @@
 #define	EPT_ENABLE_AD_BITS	(1 << 6)
 
 SYSCTL_DECL(_hw_vmm);
-SYSCTL_NODE(_hw_vmm, OID_AUTO, ept, CTLFLAG_RW, NULL, NULL);
+SYSCTL_NODE(_hw_vmm, OID_AUTO, ept, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
+    NULL);
 
 static int ept_enable_ad_bits;
 
Index: head/sys/amd64/vmm/intel/vmx.c
===================================================================
--- head/sys/amd64/vmm/intel/vmx.c
+++ head/sys/amd64/vmm/intel/vmx.c
@@ -123,7 +123,8 @@
 static MALLOC_DEFINE(M_VLAPIC, "vlapic", "vlapic");
 
 SYSCTL_DECL(_hw_vmm);
-SYSCTL_NODE(_hw_vmm, OID_AUTO, vmx, CTLFLAG_RW, NULL, NULL);
+SYSCTL_NODE(_hw_vmm, OID_AUTO, vmx, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
+    NULL);
 
 int vmxon_enabled[MAXCPU];
 static char vmxon_region[MAXCPU][PAGE_SIZE] __aligned(PAGE_SIZE);
@@ -150,7 +151,9 @@
 /*
  * Optional capabilities
  */
-static SYSCTL_NODE(_hw_vmm_vmx, OID_AUTO, cap, CTLFLAG_RW, NULL, NULL);
+static SYSCTL_NODE(_hw_vmm_vmx, OID_AUTO, cap,
+    CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
+    NULL);
 
 static int cap_halt_exit;
 SYSCTL_INT(_hw_vmm_vmx_cap, OID_AUTO, halt_exit, CTLFLAG_RD, &cap_halt_exit, 0,
Index: head/sys/amd64/vmm/io/iommu.c
===================================================================
--- head/sys/amd64/vmm/io/iommu.c
+++ head/sys/amd64/vmm/io/iommu.c
@@ -48,7 +48,8 @@
 #include "iommu.h"
 
 SYSCTL_DECL(_hw_vmm);
-SYSCTL_NODE(_hw_vmm, OID_AUTO, iommu, CTLFLAG_RW, 0, "bhyve iommu parameters");
+SYSCTL_NODE(_hw_vmm, OID_AUTO, iommu, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+    "bhyve iommu parameters");
 
 static int iommu_avail;
 SYSCTL_INT(_hw_vmm_iommu, OID_AUTO, initialized, CTLFLAG_RD, &iommu_avail,
Index: head/sys/amd64/vmm/io/ppt.c
===================================================================
--- head/sys/amd64/vmm/io/ppt.c
+++ head/sys/amd64/vmm/io/ppt.c
@@ -112,7 +112,8 @@
 };
 
 SYSCTL_DECL(_hw_vmm);
-SYSCTL_NODE(_hw_vmm, OID_AUTO, ppt, CTLFLAG_RW, 0, "bhyve passthru devices");
+SYSCTL_NODE(_hw_vmm, OID_AUTO, ppt, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+    "bhyve passthru devices");
 
 static int num_pptdevs;
 SYSCTL_INT(_hw_vmm_ppt, OID_AUTO, devices, CTLFLAG_RD, &num_pptdevs, 0,
Index: head/sys/amd64/vmm/io/vrtc.c
===================================================================
--- head/sys/amd64/vmm/io/vrtc.c
+++ head/sys/amd64/vmm/io/vrtc.c
@@ -106,7 +106,8 @@
 static MALLOC_DEFINE(M_VRTC, "vrtc", "bhyve virtual rtc");
 
 SYSCTL_DECL(_hw_vmm);
-SYSCTL_NODE(_hw_vmm, OID_AUTO, vrtc, CTLFLAG_RW, NULL, NULL);
+SYSCTL_NODE(_hw_vmm, OID_AUTO, vrtc, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
+    NULL);
 
 static int rtc_flag_broken_time = 1;
 SYSCTL_INT(_hw_vmm_vrtc, OID_AUTO, flag_broken_time, CTLFLAG_RDTUN,
Index: head/sys/amd64/vmm/vmm.c
===================================================================
--- head/sys/amd64/vmm/vmm.c
+++ head/sys/amd64/vmm/vmm.c
@@ -215,7 +215,8 @@
 /* statistics */
 static VMM_STAT(VCPU_TOTAL_RUNTIME, "vcpu total runtime");
 
-SYSCTL_NODE(_hw, OID_AUTO, vmm, CTLFLAG_RW, NULL, NULL);
+SYSCTL_NODE(_hw, OID_AUTO, vmm, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
+    NULL);
 
 /*
  * Halt the guest if all vcpus are executing a HLT instruction with
Index: head/sys/amd64/vmm/vmm_dev.c
===================================================================
--- head/sys/amd64/vmm/vmm_dev.c
+++ head/sys/amd64/vmm/vmm_dev.c
@@ -962,8 +962,9 @@
 	return (error);
 }
 SYSCTL_PROC(_hw_vmm, OID_AUTO, destroy,
-	    CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
-	    NULL, 0, sysctl_vmm_destroy, "A", NULL);
+    CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
+    NULL, 0, sysctl_vmm_destroy, "A",
+    NULL);
 
 static struct cdevsw vmmdevsw = {
 	.d_name		= "vmmdev",
@@ -1045,8 +1046,9 @@
 	return (error);
 }
 SYSCTL_PROC(_hw_vmm, OID_AUTO, create,
-	    CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON,
-	    NULL, 0, sysctl_vmm_create, "A", NULL);
+    CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_MPSAFE,
+    NULL, 0, sysctl_vmm_create, "A",
+    NULL);
 
 void
 vmmdev_init(void)
Index: head/sys/amd64/vmm/x86.c
===================================================================
--- head/sys/amd64/vmm/x86.c
+++ head/sys/amd64/vmm/x86.c
@@ -50,7 +50,8 @@
 #include "x86.h"
 
 SYSCTL_DECL(_hw_vmm);
-static SYSCTL_NODE(_hw_vmm, OID_AUTO, topology, CTLFLAG_RD, 0, NULL);
+static SYSCTL_NODE(_hw_vmm, OID_AUTO, topology, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
+    NULL);
 
 #define	CPUID_VM_HIGH		0x40000000