NEX-14556 xnf: panic on Xen 4.x
Reviewed by: Dan Fields <dan.fields@nexenta.com>
Reviewed by: Roman Strashkin <roman.strashkin@nexenta.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

*** 1055,1070 ****
          xnfp->xnf_rx_head = NULL;
          xnfp->xnf_rx_tail = NULL;
          xnfp->xnf_rx_new_buffers_posted = B_FALSE;
  
  #ifdef XPV_HVM_DRIVER
!         /*
!          * Report our version to dom0.
!          */
!         if (xenbus_printf(XBT_NULL, "guest/xnf", "version", "%d",
!             HVMPV_XNF_VERS))
!                 cmn_err(CE_WARN, "xnf: couldn't write version\n");
  #endif
  
          /*
           * Get the iblock cookie with which to initialize the mutexes.
           */
--- 1055,1067 ----
          xnfp->xnf_rx_head = NULL;
          xnfp->xnf_rx_tail = NULL;
          xnfp->xnf_rx_new_buffers_posted = B_FALSE;
  
  #ifdef XPV_HVM_DRIVER
!         /* Report our version to dom0 */
!         (void) xenbus_printf(XBT_NULL, "guest/xnf", "version", "%d",
!             HVMPV_XNF_VERS);
  #endif
  
          /*
           * Get the iblock cookie with which to initialize the mutexes.
           */