since 7.2.
VirtaulBox commits a17d3e2a0bae and deed9bb7bd94 rename SUPR0EnableVTx -> SUPR0EnableHwvirt
use hma_register_exclusive also for Openindiana

--- a/src/VBox/HostDrivers/Support/solaris/SUPDrv-solaris.c
+++ b/src/VBox/HostDrivers/Support/solaris/SUPDrv-solaris.c
@@ -57,6 +57,7 @@
 #include <sys/priv_names.h>
 #include <vm/hat.h>
 #undef u /* /usr/include/sys/user.h:249:1 is where this is defined to (curproc->p_user). very cool. */
+#include <sys/hma.h>
 
 #include "../SUPDrvInternal.h"
 #include <VBox/log.h>
@@ -986,6 +987,42 @@
     return false;
 }
 
+static const char *vbox_hma_ident = DEVICE_DESC;
+static hma_reg_t *vbox_hma_reg;
+
+int VBOXCALL supdrvOSEnableHwvirt(bool fEnable)
+{
+	hma_reg_t *reg;
+
+
+	if (fEnable) {
+		cmn_err(CE_NOTE, "!Registering hypervisor\n");
+		if (vbox_hma_reg)
+			return VINF_SUCCESS;
+
+#if OOCEVER >= 151029
+		if ((reg = hma_register_exclusive(vbox_hma_ident)) == NULL)
+#else
+		if ((reg = hma_register(vbox_hma_ident)) == NULL)
+#endif
+			return VERR_NOT_SUPPORTED;
+
+		cmn_err(CE_NOTE, "!Successfully registered '%s'\n",
+		    vbox_hma_ident);
+
+		vbox_hma_reg = reg;
+		return VINF_SUCCESS;
+	}
+
+	if (vbox_hma_reg) {
+		cmn_err(CE_NOTE, "!Unregistering hypervisor\n");
+		hma_unregister(vbox_hma_reg);
+		vbox_hma_reg = NULL;
+	}
+
+	return VINF_SUCCESS;
+}
+
 
 #if  defined(VBOX_WITH_NATIVE_SOLARIS_LOADING) \
  && !defined(VBOX_WITHOUT_NATIVE_R0_LOADER)
diff --git a/src/VBox/HostDrivers/Support/SUPDrv.cpp b/src/VBox/HostDrivers/Support/SUPDrv.cpp
index 0d43c10..f36406f 100644
--- a/src/VBox/HostDrivers/Support/SUPDrv.cpp
+++ b/src/VBox/HostDrivers/Support/SUPDrv.cpp
@@ -4316,6 +4316,8 @@ SUPR0DECL(int) SUPR0EnableHwvirt(bool fEnable)
     return supdrvOSEnableHwvirt(fEnable);
 # elif defined(RT_OS_LINUX) && (defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86))
     return supdrvOSEnableHwvirt(fEnable);
+# elif defined(RT_OS_SOLARIS)
+    return supdrvOSEnableHwvirt(fEnable);
 # else
     RT_NOREF1(fEnable);
     return VERR_NOT_SUPPORTED;
diff --git a/src/VBox/HostDrivers/Support/solaris/SUPDrv-solaris.c b/src/VBox/HostDrivers/Support/solaris/SUPDrv-solaris.c
index c1efb45..2a51675 100644
--- a/src/VBox/HostDrivers/Support/solaris/SUPDrv-solaris.c
+++ b/src/VBox/HostDrivers/Support/solaris/SUPDrv-solaris.c
@@ -1003,7 +1003,7 @@ int VBOXCALL supdrvOSEnableHwvirt(bool fEnable)
 		if (vbox_hma_reg)
 			return VINF_SUCCESS;
 
-#if OOCEVER >= 151029
+#if 1
 		if ((reg = hma_register_exclusive(vbox_hma_ident)) == NULL)
 #else
 		if ((reg = hma_register(vbox_hma_ident)) == NULL)