o Fix OpenSSH xauth(1) command injection. [SA-16:14]
o Fix incorrect argument validation in sysarch(2). [SA-16:15]
o Fix Hyper-V KVP (Key-Value Pair) daemon indefinite sleep. [EN-16:04]

Errata: FreeBSD-EN-16:04.hyperv
Security: FreeBSD-SA-16:14.openssh-xauth, CVE-2016-3115
Security: FreeBSD-SA-16:15.sysarch, CVE-2016-1885
Approved by: so

MFS r273580: MFC r273577:

Return BUS_PROBE_DEFAULT instead of BUS_PROBE_VENDOR or 0 for in-tree
driver. This change was verified by Microsoft.

Approved by: re (kib)

MFstable10 r273429:
MFC r273402:
Fix an issue where a FreeBSD virtual machine provisioned in
the Microsoft Azure service does not recognize the second
attached disk on the system.

PR: 194376
Approved by: re (delphij)
Sponsored by: The FreeBSD Foundation

Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r271493,271688-271689,271696,271854,272139-272143:

Import HyperV Key-Value Pair (KVP) driver and daemon code by Microsoft,
many thanks for their continued support of FreeBSD.

While I'm there, also implement a new build knob, WITHOUT_HYPERV to
disable building and installing of the HyperV utilities when necessary.

The HyperV utilities are only built for i386 and amd64 targets.

Approved by: re (gjb)

Properly revert r272128.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Revert r272149, which introduces obscure vestiges from the
r272128 reversal.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Revert r272128:
Though this passes the buildworld test, this fails during
installworld with:

make[3]: "/releng/scripts-release/chroots/10/i386/release/etc/devd/Makefile"
line 13: Malformed conditional (${MK_HYPERV} != "no")

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC r271493,271688,271689,271696,271854:

Import HyperV Key-Value Pair (KVP) driver and daemon code by Microsoft,
many thanks for their continued support of FreeBSD.

While I'm there, also implement a new build knob, WITHOUT_HYPERV to
disable building and installing of the HyperV utilities when necessary.

The HyperV utilities are only built for i386 and amd64 targets.

Approved by: re (gjb)

MFC: r264177

Make some unwise casts. On i386 these casts wind up being safe. Rather
than disturb the API, go with these casts to shut gcc up.

MFC r257334, r257336, r257337, r257338, r257341, r257342, r257343, r257370,
r257368, r257416

Hints-only devices should return BUS_PROBE_NOWILDCARD from their probe
methods.

MFC r259180 (pjd) + r263123:

Hide a few messages under bootverbose.

MFC r262789, r262847:
Remove custom bus scanner code and fix use of CAM's default scanner.

This fixes kernel panic during boot, caused by incompatibility of recent
CAM locking changes and this bus scanner code.

Submitted by: Microsoft

Hoist all the mergeinfo up to the root in preparation for enforcing merges
to the root only. All MFC's were rerecorded to the root.

Going forward, if an MFC includes mergeinfo, it will need to be made to
the root and committed from the root. Merges with --ignore-ancestry
or diff | patch can go anywhere.

The mergeinfo in HEAD is in a bad state from years of neglect and manual
tampering and this was branched into 10.x. This confuses the coalescing
code and prevents it from doing its job.

Approved by: re (gjb, implicit)

MFC r257369:

Don't reference pointer before testing whether it is
NULL.

Submitted by: Clement Lecigne <clecigne google com>
Reviewed by: grehan
Approved by: re (kib)

MFC r256425:

Centralize the detection logic for the Hyper-V hypervisor.

Submitted by: Roger Pau Monné
Sponsored by: Citrix Systems R&D
Reviewed by: gibbs, grehan
Approved by: re (gjb)

sys/sys/systm.h:
* Add a new VM_GUEST type, VM_GUEST_HV (HyperV guest).

sys/dev/hyperv/vmbus/hv_vmbus_drv_freebsd.c:
sys/dev/hyperv/vmbus/hv_hv.c:
sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c:
* Set vm_guest to VM_GUEST_HV and use that on other HyperV related
devices instead of cloning the cpuid hypervisor check.
* Cleanup the vmbus_identify function.
------------------------------------------------------------------------

MFC r256362

Fix a lock-order reversal in the net driver by dropping the lock
and holding a reference prior to calling further into the hyperv
stack.

Added missing FreeBSD idents.

Approved by: re@ (gjb)

MFC r256350

Fix vmbus channel memory leak where incorrect length parameter was
being passed to contigfree().

Approved by: re@ (glebius)

MFC r256304

Allow the legacy CDROM device to be accessed in a FreeBSD guest, while
still using enlightened drivers for other block devices.

Approved by: re@ (gjb)

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

In sys/dev/hyperv, fix a number of gcc warnings about usage of anonymous
union members in strict C99, by giving them names. While here, add some
FreeBSD keywords where they were missing.

Approved by: re (gjb)
Reviewed by: grehan

Correct panic caused by attaching both Xen PV and HyperV virtualization
aware drivers on Xen hypervisors that advertise support for some
HyperV features.

x86/xen/hvm.c:
When running in HVM mode on a Xen hypervisor, set vm_guest
to VM_GUEST_XEN so other virtualization aware components in
the FreeBSD kernel can detect this mode is active.

dev/hyperv/vmbus/hv_hv.c:
Use vm_guest to ignore Xen's HyperV emulation when Xen is
detected and Xen PV drivers are active.

Reported by: Shanker Balan
Submitted by: Roger Pau Monné
Sponsored by: Citrix Systems R&D
Reviewed by: gibbs
Approved by: re (Xen blanket)

Reorder the hypervisor presence test to avoid claiming ATA disks
on non hyperv systems.

Reviewed by: neel, abgupta at microsoft dot com
Approved by: re@ (hrs)

Fix missing SVN properties.

Approved by: re@ (hrs)

Import Hyper-V paravirtualized drivers from projects/hyperv
branch into head.

Approved by: re@ (hrs)
Obtained from: Microsoft, NetApp, and Citrix.

Revert the kvp code - there's still some work that
needs to be done for that.

Discussed with: Microsoft hyper-v devs

Latest update from Microsoft.

Obtained from: Microsoft Hyper-v dev team

IFC @ r253862

- change the SI_SUB_RUN_SCHEDULER sysinits in hv_utilc and
hv_netvsc_drv_freebsd.c to SI_SUB_KTHREAD_IDLE, since the
former is no longer in FreeBSD.
The use of these SYSINITs can probably be removed.

Microsoft have changed their policy on how the hyper-v code will
be pulled into FreeBSD. From now, FreeBSD will be considered the
upstream repo.

First step: move the drivers away from the contrib area and into
the base system.

A follow-on commit will include the drivers in the amd64 GENERIC kernel.

Import driver source from hyperv-20130627 vendor branch.

Import driver source from hyperv-20130502 vendor branch.

Tag hyperv 20130502

Initial import of the Microsoft HyperV 'enlightened' drivers.

From https://github.com/FreeBSDonHyper-V/VendorBranchForFreeBSDonHyper-V
rev: 99eaa0ddb0485c9d76046664100f6beb1a0a0c58