I've just checked out and built projects/hyperv and everything looks good.

mox@bsdtest:~ % uname -a
FreeBSD bsdtest 10.0-CURRENT FreeBSD 10.0-CURRENT #0: Wed Sep 11
12:09:08 MSK 2013     mox@bsdtest:/usr/obj/usr/src/sys/GENERIC  amd64

bsdtest:~ % df -h
Filesystem           Size    Used   Avail Capacity  Mounted on
/dev/label/rootfs     36G    2.7G     31G     8%    /
devfs                1.0k    1.0k      0B   100%    /dev

mox@bsdtest:~ % ifconfig
de0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:15:5d:02:9a:6f
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
        inet 127.0.0.1 netmask 0xff000000
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
hn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=18<VLAN_MTU,VLAN_HWTAGGING>
        ether 00:15:5d:02:9a:6e
        inet 192.168.25.5 netmask 0xffffffc0 broadcast 192.168.25.63
        inet6 fe80::215:5dff:fe02:9a6e%hn0 prefixlen 64 scopeid 0x3
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>

Copyright (c) 1992-2013 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
        The Regents of the University of California. All rights reserved.
FreeBSD is a registered trademark of The FreeBSD Foundation.
FreeBSD 10.0-CURRENT #0: Wed Sep 11 12:09:08 MSK 2013
    mox@bsdtest:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.3 (trunk 178860) 20130405
WARNING: WITNESS option enabled, expect reduced performance.
CPU: Intel(R) Xeon(R) CPU           L5520  @ 2.27GHz (1140.71-MHz K8-class CPU)
  Origin = "GenuineIntel"  Id = 0x106a5  Family = 0x6  Model = 0x1a
Stepping = 5
  
Features=0x1f83fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,SS,HTT>
  Features2=0x80002001<SSE3,CX16,HV>
  AMD Features=0x20100800<SYSCALL,NX,LM>
  AMD Features2=0x1<LAHF>
real memory  = 1073741824 (1024 MB)
avail memory = 1011179520 (964 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <VRTUAL MICROSFT>
FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
FreeBSD/SMP: 1 package(s) x 2 core(s)
 cpu0 (BSP): APIC ID:  0
 cpu1 (AP): APIC ID:  1
ioapic0: Changing APIC ID to 0
ioapic0 <Version 1.1> irqs 0-23 on motherboard
random: <Software, Yarrow> initialized
kbd1 at kbdmux0
vmbus0: <Vmbus Devices> on motherboard
acpi0: <VRTUAL MICROSFT> on motherboard
acpi0: Power Button (fixed)
acpi0: reservation of 0, a0000 (3) failed
acpi0: reservation of 100000, f7f00000 (3) failed
cpu0: <ACPI CPU> on acpi0
cpu1: <ACPI CPU> on acpi0
attimer0: <AT timer> port 0x40-0x43 irq 0 on acpi0
Timecounter "i8254" frequency 1193182 Hz quality 0
Event timer "i8254" frequency 1193182 Hz quality 100
atrtc0: <AT realtime clock> port 0x70-0x71 irq 8 on acpi0
Event timer "RTC" frequency 32768 Hz quality 0
Timecounter "ACPI-fast" frequency 3579545 Hz quality 900
acpi_timer0: <32-bit timer at 3.579545MHz> port 0x408-0x40b on acpi0
pcib0: <ACPI Host-PCI bridge> port 0xcf8-0xcff on acpi0
pci0: <ACPI PCI bus> on pcib0
isab0: <PCI-ISA bridge> at device 7.0 on pci0
isa0: <ISA bus> on isab0
pciata-disable0 port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xffa0-0xffaf
at device 7.1 on pci0
pci0: <bridge> at device 7.3 (no driver attached)
vgapci0: <VGA-compatible display> mem 0xf8000000-0xfbffffff irq 11 at
device 8.0 on pci0
de0: <Digital 21140A Fast Ethernet> port 0xec00-0xec7f mem
0xfebff000-0xfebfffff irq 11 at device 10.0 on pci0
de0: 21140A [10-100Mb/s] pass 2.0
de0: Ethernet address: 00:15:5d:02:9a:6f
atkbdc0: <Keyboard controller (i8042)> port 0x60,0x64 irq 1 on acpi0
atkbd0: <AT Keyboard> irq 1 on atkbdc0
kbd0 at atkbd0
atkbd0: [GIANT-LOCKED]
psm0: <PS/2 Mouse> irq 12 on atkbdc0
psm0: [GIANT-LOCKED]
psm0: model IntelliMouse Explorer, device ID 4
uart0: <16550 or compatible> port 0x3f8-0x3ff irq 4 flags 0x10 on acpi0
uart1: <16550 or compatible> port 0x2f8-0x2ff irq 3 on acpi0
fdc0: <floppy drive controller (FDE)> port 0x3f0-0x3f5,0x3f7 irq 6 drq
2 on acpi0
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
qpi0: <QPI system bus> on motherboard
orm0: <ISA Option ROMs> at iomem 0xc0000-0xcbfff,0xcc000-0xcc7ff on isa0
sc0: <System console> at flags 0x100 on isa0
sc0: VGA <16 virtual consoles, flags=0x300>
vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
ppc0: cannot reserve I/O port range
Timecounter "Hyper-V" frequency 10000000 Hz quality 10000000
Timecounters tick every 10.000 msec
storvsc0 on vmbus0
hyperv-utils0 on vmbus0
hyperv-utils0: Hyper-V Service attaching: Hyper-V Heartbeat Service

hyperv-utils1 on vmbus0
hyperv-utils1: Hyper-V Service attaching: Hyper-V Shutdown Service

hyperv-utils2 on vmbus0
hyperv-utils2: Hyper-V Service attaching: Hyper-V Time Synch Service

storvsc1 on vmbus0
Netvsc initializing... SMP: AP CPU #1 Launched!
WARNING: WITNESS option enabled, expect reduced performance.
da0 at blkvsc0 bus 0 scbus0 target 0 lun 0
da0: <Msft Virtual Disk 1.0> Fixed Direct Access SCSI-4 device
da0: 300.000MB/s transfers
da0: Command Queueing enabled
da0: 40960MB (83886080 512 byte sectors: 255H 63S/T 5221C)
Netvsc probe... DONE
hn0: <Synthetic Network Interface> on vmbus0
Netvsc initializing... Already initialized!
hn0: Ethernet address: 00:15:5d:02:9a:6e
Trying to mount root from ufs:/dev/label/rootfs [rw]...
Setting hostuuid: 18dd792a-1881-6c47-a238-7828b05795ca.
Setting hostid: 0x7908af74.
Entropy harvesting: interrupts ethernet point_to_point kickstart.
Starting file system checks:
/dev/label/rootfs: FILE SYSTEM CLEAN; SKIPPING CHECKS
/dev/label/rootfs: clean, 8460523 free (4739 frags, 1056973 blocks,
0.0% fragmentation)
Mounting local file systems:.
Writing entropy file:.
Setting hostname: bsdtest.
Waiting on "rndis sema" with the following non-sleepable locks held:
exclusive sleep mutex NetVSCLock (network driver) r = 0
(0xfffff80002830030) locked @
/usr/src/sys/dev/hyperv/netvsc/hv_netvsc_drv_freebsd.c:904
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe003d395550
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe003d395600
witness_warn() at witness_warn+0x4a8/frame 0xfffffe003d3956c0
_cv_timedwait_sbt() at _cv_timedwait_sbt+0x96/frame 0xfffffe003d395740
_sema_timedwait() at _sema_timedwait+0x74/frame 0xfffffe003d395780
hv_rf_set_packet_filter() at hv_rf_set_packet_filter+0x184/frame
0xfffffe003d3957c0
hv_rf_on_open() at hv_rf_on_open+0x46/frame 0xfffffe003d3957e0
hn_ifinit() at hn_ifinit+0xbe/frame 0xfffffe003d395820
ether_ioctl() at ether_ioctl+0x8a/frame 0xfffffe003d395850
hn_ioctl() at hn_ioctl+0x28a/frame 0xfffffe003d3958b0
in_control() at in_control+0xbe5/frame 0xfffffe003d395960
ifioctl() at ifioctl+0xf52/frame 0xfffffe003d395a20
kern_ioctl() at kern_ioctl+0x2ca/frame 0xfffffe003d395a90
sys_ioctl() at sys_ioctl+0x11f/frame 0xfffffe003d395ae0
amd64_syscall() at amd64_syscall+0x265/frame 0xfffffe003d395bf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe003d395bf0
--- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x80119c1fa, rsp =
0x7fffffffd488, rbp = 0x7fffffffd4d0 ---
Starting Network: lo0 de0 hn0.
lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
        inet6 ::1 prefixlen 128
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
        inet 127.0.0.1 netmask 0xff000000
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
de0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:15:5d:02:9a:6f
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
hn0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
        options=18<VLAN_MTU,VLAN_HWTAGGING>
        ether 00:15:5d:02:9a:6e
        inet 192.168.25.5 netmask 0xffffffc0 broadcast 192.168.25.63
        inet6 fe80::215:5dff:fe02:9a6e%hn0 prefixlen 64 scopeid 0x3
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
Starting devd.
Starting Network: de0.
de0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> metric 0 mtu 1500
        ether 00:15:5d:02:9a:6f
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        media: Ethernet autoselect
add net default: gateway 192.168.25.1
add net fe80::: gateway ::1
add net ff02::: gateway ::1
add net ::ffff:0.0.0.0: gateway ::1
add net ::0.0.0.0: gateway ::1
Creating and/or trimming log files.
Starting syslogd.
No core dumps found.
ELF ldconfig path: /lib /usr/lib /usr/lib/compat
32-bit compatibility ldconfig path: /usr/lib32
Clearing /tmp (X related).
Updating motd:.
Mounting late file systems:.
Configuring syscons: blanktime.
Performing sanity check on sshd configuration.
Starting sshd.
Starting cron.
Starting background file system checks in 60 seconds.

Wed Sep 11 16:28:18 MSK 2013
lock order reversal:
 1st 0xfffffe003d50e970 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:3059
 2nd 0xfffff80002e14a00 dirhash (dirhash) @
/usr/src/sys/ufs/ufs/ufs_dirhash.c:284
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe003d3db660
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe003d3db710
witness_checkorder() at witness_checkorder+0xd23/frame 0xfffffe003d3db7a0
_sx_xlock() at _sx_xlock+0x75/frame 0xfffffe003d3db7e0
ufsdirhash_remove() at ufsdirhash_remove+0x37/frame 0xfffffe003d3db810
ufs_dirremove() at ufs_dirremove+0x11b/frame 0xfffffe003d3db860
ufs_remove() at ufs_remove+0x75/frame 0xfffffe003d3db8c0
VOP_REMOVE_APV() at VOP_REMOVE_APV+0xf0/frame 0xfffffe003d3db8f0
kern_unlinkat() at kern_unlinkat+0x20c/frame 0xfffffe003d3dbae0
amd64_syscall() at amd64_syscall+0x265/frame 0xfffffe003d3dbbf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe003d3dbbf0
--- syscall (10, FreeBSD ELF64, sys_unlink), rip = 0x80093958a, rsp =
0x7fffffffda18, rbp = 0x7fffffffdae0 ---

2013/8/29 Abhishek Gupta (LIS) <abgu...@microsoft.com>:
> Hi Pavel,
>
> Yes, FreeBSD 10 is still the target. We are working to make it in to the 
> tree. You should see some traction next week.
>
> Thanks,
> Abhishek
> ________________________________________
> From: Pavel Timofeev <tim...@gmail.com>
> Sent: Thursday, August 29, 2013 3:31 AM
> To: Abhishek Gupta (LIS)
> Cc: Peter Grehan; freebsd-virtualization@freebsd.org
> Subject: Re: Hyper-V driver development status
>
> So, is it going to be included in FreeBSD 10 now? As I can see code
> freeze for CURRENT is planned on 7 September 2013 (10 days from now).
> http://www.freebsd.org/releases/10.0R/schedule.html
> It's not much time.
>
> 2013/8/17 Abhishek Gupta (LIS) <abgu...@microsoft.com>:
>> Hi Pavel,
>>
>> Thanks for inquiring about the BSD drivers for Hyper-V. We (Microsoft) are 
>> actively working on these drivers and the intent is to get them integrated 
>> in to the kernel within the next month or so. There are some issues we are 
>> trying to address:
>>
>> a) Witness panic during boot time due to a specific memory allocation.
>> b) Bypass usage of disk labels to ensure that devices do not get reordered 
>> under FreeBSD.
>> c) Locks up on 32 bit builds.
>> d) Lack of KVP support for BSD drivers
>>
>> We are working hard every day to finish these items.
>>
>> Even though an official announcement has not gone out, I would highly 
>> encourage you to start testing the drivers. As they are in project branch 
>> now they should be easy to compile. The only requirement is to set up disk 
>> labels before rebooting a kernel that includes the Hyper-V drivers otherwise 
>> the system will not boot up.
>>
>> Please let me know if you have more questions or have feedback.
>>
>> Thanks again for your interest.
>> Abhishek
>> ________________________________________
>> From: Peter Grehan <gre...@freebsd.org>
>> Sent: Friday, August 16, 2013 11:30 AM
>> To: Abhishek Gupta (LIS)
>> Subject: Fwd: Hyper-V driver development status
>>
>> Want to reply to this ?
>>
>>
>> -------- Original Message --------
>> Subject: Hyper-V driver development status
>> Date: Fri, 16 Aug 2013 17:00:57 +0400
>> From: Pavel Timofeev <tim...@gmail.com>
>> To: freebsd-virtualization@freebsd.org
>>
>> Hi all!
>> I'd like to know what's happening with hyper-v driver development in
>> FreeBSD.
>> I know about svn branch but there is no active progress in there.
>> What's the roadmap? Or we are waiting for something?
>>
>> What is the current status of that project?
>> I could do some tests. Or it's too early?
>> I'm looking forward to use it =)
>> _______________________________________________
>> freebsd-virtualization@freebsd.org mailing list
>> http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization
>> To unsubscribe, send any mail to
>> "freebsd-virtualization-unsubscr...@freebsd.org"
>>
>>
>>
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