tested new proposed kernel, and it works:

utlemming@utl-0917-s3a:~$ cat 
/sys/devices/LNXSYSTM:00/device:00/PNP0A03:00/device:08/VMBUS:00/vmbus_0_2/host3/target3:0:1/3:0:1:0/scsi_disk/3:0:1:0/thin_provisioning
 
1
utlemming@utl-0917-s3a:~$ cat 
/sys/devices/LNXSYSTM:00/device:00/PNP0A03:00/device:08/VMBUS:00/vmbus_0_1/host2/target2:0:0/2:0:0:0/scsi_disk/2:0:0:0/provisioning_mode
unmap
utlemming@utl-0917-s3a:~$ cat 
/sys/devices/LNXSYSTM:00/device:00/PNP0A03:00/device:08/VMBUS:00/vmbus_0_2/host3/target3:0:1/3:0:1:0/scsi_disk/3:0:1:0/provisioning_mode
unmap
utlemming@utl-0917-s3a:~$ uname -a
Linux utl-0917-s3a 3.11.0-8-generic #14~lp1223499v201309131830 SMP Fri Sep 13 
17:31:57 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1223499

Title:
  Enable TRIM support in Ubuntu for Hyper-V

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Saucy:
  Fix Released

Bug description:
  Microsoft has asked for us to enable unmap support Hyper-V targets.
  The current kernels for 12.04 and later do not correctly identify the
  devices as being capable of supporting unmap

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1223499/+subscriptions

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