NEX-16215 xvdi_init_dev() truncates the unit address to 7 characters
Reviewed by: Roman Strashkin <roman.strashkin@nexenta.com>
Reviewed by: Sanjay Nadkarni <sanjay.nadkarni@nexenta.com>
Reviewed by: Evan Layton <evan.layton@nexenta.com>
8019 Some PV devices should not be configured in HVM mode
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Basil Crow <basil.crow@delphix.com>
Approved by: Dan McDonald <danmcd@omniti.com>
re #13140 rb4270 hvm_sd module missing dependencies on scsi and cmlb
re #13166 rb4270 Check for Xen HVM even if CPUID signature returns Microsoft Hv
re #13187 rb4270 Fix Xen HVM related warnings

*** 24,33 ****
--- 24,34 ----
   * Use is subject to license terms.
   */
  
  /*
   * Copyright (c) 2014 by Delphix. All rights reserved.
+  * Copyright 2018 Nexenta Systems, Inc.
   */
  
  /*
   * Xen virtual device driver interfaces
   */
*** 250,260 ****
          boolean_t backend;
          char xsnamebuf[TYPICALMAXPATHLEN];
          char *xsname;
          void *prop_str;
          unsigned int prop_len;
!         char unitaddr[8];
  
          devcls = ddi_prop_get_int(DDI_DEV_T_ANY, dip,
              DDI_PROP_DONTPASS, "devclass", XEN_INVAL);
          vdevnum = ddi_prop_get_int(DDI_DEV_T_ANY, dip,
              DDI_PROP_DONTPASS, "vdev", VDEV_NOXS);
--- 251,261 ----
          boolean_t backend;
          char xsnamebuf[TYPICALMAXPATHLEN];
          char *xsname;
          void *prop_str;
          unsigned int prop_len;
!         char unitaddr[16];
  
          devcls = ddi_prop_get_int(DDI_DEV_T_ANY, dip,
              DDI_PROP_DONTPASS, "devclass", XEN_INVAL);
          vdevnum = ddi_prop_get_int(DDI_DEV_T_ANY, dip,
              DDI_PROP_DONTPASS, "vdev", VDEV_NOXS);
*** 331,341 ****
          /*
           * The unit-address for frontend devices is the name of the
           * of the xenstore node containing the device configuration
           * and is contained in the 'vdev' property.
           * VIF devices are named using an incrementing integer.
!          * VBD devices are either named using the 16-bit dev_t value
           * for linux 'hd' and 'xvd' devices, or a simple integer value
           * in the range 0..767.  768 is the base value of the linux
           * dev_t namespace, the dev_t value for 'hda'.
           */
          (void) snprintf(unitaddr, sizeof (unitaddr), "%d", vdevnum);
--- 332,342 ----
          /*
           * The unit-address for frontend devices is the name of the
           * of the xenstore node containing the device configuration
           * and is contained in the 'vdev' property.
           * VIF devices are named using an incrementing integer.
!          * VBD devices are either named using the 32-bit dev_t value
           * for linux 'hd' and 'xvd' devices, or a simple integer value
           * in the range 0..767.  768 is the base value of the linux
           * dev_t namespace, the dev_t value for 'hda'.
           */
          (void) snprintf(unitaddr, sizeof (unitaddr), "%d", vdevnum);