Enable the "Acknowledge Interrupt on VM exit" VM-exit control.

This control is needed to enable "Posted Interrupts" and is present in all
the Intel VT-x implementations supported by bhyve so enable it as the default.

With this VM-exit control enabled the processor will acknowledge the APIC and
store the vector number in the "VM-Exit Interruption Information" field. We
now call the interrupt handler "by hand" through the IDT entry associated
with the vector.
Enable "Posted Interrupt Processing" if supported by the CPU. This lets us
inject interrupts into the guest without causing a VM-exit.

This feature can be disabled by setting the tunable "hw.vmm.vmx.use_apic_pir"
to "0".

The following sysctls provide information about this feature:
- hw.vmm.vmx.posted_interrupts (0 if disabled, 1 if enabled)
- hw.vmm.vmx.posted_interrupt_vector (vector number used for vcpu notification)

Tested on a Intel Xeon E5-2620v2 courtesy of Allan Jude at ScaleEngine.
Save and restore the GPIOs on the macio for suspend/resume.
Move USB ID from u3g driver to uhso driver.

Submitted by:	Lundberg, Johannes <johannes@brilliantservice.co.jp>
MFC after:	1 week
Force clearing of event ring interrupts. The "Intel Lynx Point" XHCI
controller found in the MBP2013 has been observed to not work properly
unless this operation is performed.

MFC after:	1 week
Tested by:	Huang Wen Hui <huanghwh@gmail.com>
Optimise interrupt logic. Technically writing a zero to the XHCI USB
status register has no effect. Can happen when the interrupt vector is
shared.

MFC after:	1 week
Bump dates in nestat(1) and route(8) man pages.
Fix several small errors introduced by r260524.

Suggested by:	glebius
MFC after:	2 weeks
Take additional reference on SCSI probe periph to cover its freeze count.

Otherwise periph may be invalidated and freed before single-stepping freeze
is dropped, causing use after free panic.
Fix a logic error when checking if Tx power entries are greater than 31.
Add myself as a ports committer

Approved by:	thierry (mentor)
Close the newly-created FD if the pathname is too long.

Coverity:	CID 1007204
Sponsored by:	Netflix, Inc.
ext2fs: fix inode flag conversion.

After r252890 we are naively attempting to pass through the
inode flags.  This is technically incorrect as the ext2
inode flags don't match the UFS/system values used in
FreeBSD and a clean conversion is needed.

Some filtering was left in place so the change didn't cause
significant changes in FreeBSD but some of the garbage passed
is likely to be the cause for warning messages in linux.

Fix the issue by resetting the flags before conversion as was
done previously. This also means we will not pass the EXT4_*
inode flags into FreeBSD's inode.

PR:		kern/185448
MFC after:	3 days
Fix for r260541: do not drop periph reference when request is restarted.
CAM_DEV_QFREEZE flag is still there and it will freeze device again.
We don't need chain write lock since we're not modifying its contents.
LibAliasSetAddress() uses its own mutex to serialize changes.

While here, convert ifp->if_xname access to if_name() function.

MFC after:	2 weeks
Sponsored by:	Yandex LLC
Move xpt_run_devq() call before request completion callback where it was
originally.

I am not sure why exactly have I moved it during one of many refactorings
during camlock project, but obviously it opens race window that may cause
use after free panics during SIM (in reported cases umass(4)) detach.

MFC after:	2 weeks
Fix amd64 build breakage caused by r260532.

Submitted by:	Marcus Karlsson (mk@acc.umu.se)
Pointy hat to:	me
Revert r260548. We really should not use IPFW_WLOCK() here
but this requires some more playing with IPFW_UH_WLOCK(). Leave till later.
Add firmware for Intel Centrino Wireless-N 105 devices.

Committed from:	Centrino 105 device
Add missing C++11 typeinfos to the libcxxrt version script.

PR:		185663
MFC after:	1 week
use a real uint64_t instead of writing code to emulate one..

I verified w/ a:
dd if=/dev/zero bs=1m count=5000 | sha256
a33351fafd00e4c4bcdee2a1c5d019026500f8cdfeaf91a9b8dbbb2619429659

Reviewed by:	cperciva
MFC after:	1 week