8622 panic in PTE_set_all()
8623 IMMU_CONTIG_PADDR is broken for cookies with more than one page
8625 nvme causes bad free panic in IOMMU
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Jerry Jelinek <jerry.jelinek@joyent.com>

*** 23,32 ****
--- 23,33 ----
   */
  /*
   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
   * Copyright (c) 2011 Bayard G. Bell.  All rights reserved.
   * Copyright 2012 Garrett D'Amore <garrett@damore.org>.  All rights reserved.
+  * Copyright 2017 Joyent, Inc.
   */
  
  /*
   * x86 root nexus driver
   */
*** 2334,2344 ****
           */
          rootnex_teardown_copybuf(dma);
          rootnex_teardown_windows(dma);
  
  #if defined(__amd64) && !defined(__xpv)
!         if (IOMMU_USED(rdip))
                  (void) iommulib_nexdma_unmapobject(dip, rdip, handle,
                      &dma->dp_dvma);
  #endif
  
          /*
--- 2335,2345 ----
           */
          rootnex_teardown_copybuf(dma);
          rootnex_teardown_windows(dma);
  
  #if defined(__amd64) && !defined(__xpv)
!         if (IOMMU_USED(rdip) && dma->dp_dvma_used)
                  (void) iommulib_nexdma_unmapobject(dip, rdip, handle,
                      &dma->dp_dvma);
  #endif
  
          /*