Liam Merwick reports that many bugs have been fixed related to LDoms:

• Networking
  
• 6405380 LDoms vSwitch needs to be modified to support network interfaces
• 6418780 vswitch needs to be able to process updates to its MD node
• 6447559 vswitch should take advantage of multiple unicast address support
• 6474949 vSwitch panics if mac_open of the underlying network device fails
• 6492423 vSwitch multi-ring code hangs when queue thread not started
• 6492705 vsw warning messages should identify device instance number
• 6512604 handshake untimeout() race condition in vnet
• 6517019 vgen_multicst does not handle kmem_zalloc failure
• 6496374 vsw: "turnstile_block: unowned mutex" panic on a diskless-clients test bed
• 6514591 vsw: fix for 6496374 causes softhang
• 6523926 handshake restart can fail following reboot under certain conditions
• 6523891 vsw needs to update lane state correctly for RDX pkts
• 6512604 handshake untimeout() race condition in vnet
• 6496374 vsw: "turnstile_block: unowned mutex" panic on a diskless-clients test bed
• 6523926 handshake restart can fail following reboot under certain conditions
• 6556036 vswitch panics when trying to boot over vnet interface
• Disk
• 6520626 Assertion panic in vdc following primary domain reboot
  
• 6527265 Hard hang in guest ldom on issuing the format command
  
• 6534269 vdc incorrectly allocs mem handle for synchronous DKIOCFLUSHWRITECACHE calls
  
• 6547651 fix for 6524333 badly impact performance when writing to a vdisk
  
• 6524333 Service domain panics if it fails to map pages for a disk on file
  
• 6530040 vds does not close underlying physical device or file properly
• General
• 6488115 reboot from guest via break hangs
• 6495154 mdeg should not print a warning when the MD generation number does not change
• 6520018 vntsd gets confused and immediately closes newly established console connections
  
• 6505472 RC1 build: guest ldg(s) softhang during repeat boot
  
• 6521890 recursive mutex_enter in ldc_set_cb_mode
  
• 6528180 link state change is not handled under certain conditions in ldc
  
• 6526280 Guest with 64 vdisk devices hangs during boot
• 6528758 'ds_cap_send: invalid handle' message during LDom boot

Liam also notes,

It is also possible to patch Solaris 10 11/06 by applying the SPARC KU patch, 120011-14 and get the new LDoms functionality for UltraSPARC-T1 based machines.