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 r271447, r271496
- Attach the ISO to an ahci-cd emulated device
- Propagate the error status of /usr/sbin/bhyve

Approved by:re (delphij)

MFC r270512 r270513 r270754
- add comments which describe exit status codes of /usr/sbin/bhyve
- move bhyvectl --destroy outside of the while loop
- Use "file -s" so that we can run vmrun.sh against special devces such as
/dev/md memory files systems or zvols

MFC 256657,257423,264837,267559:
Sync vmrun.sh with HEAD:
- Add -e option to vmrun.sh passed to bhyveload(8) to set loader
environment variables.
- Stop passing unused -I option to bhyve(8).
- Reformat the usage to fit in 80 colums and other cleanups.
- Add -C option to specify the console device.
- Add -H option to pass a host path to bhyveload(8).
- Support for multiple disk and tap devices.

MFC 267963:
The latest versoin of file/libmagic identifes a filesystem image
is identified as "DOS/MBR boot sector" as opposed to "x86 boot sector".

This trips up vmrun.sh when using the new file(1) and makes it want to boot
into the installer instead.

Fix this by just looking for "boot sector" instead.

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 r257293.

Add support for PCI-to-ISA LPC bridge emulation. If the LPC bus is attached
to a virtual machine then we implicitly create COM1 and COM2 ISA devices.

Prior to this change the only way of attaching a COM port to the virtual
machine was by presenting it as a PCI device that is mapped at the legacy
I/O address 0x3F8 or 0x2F8.

There were some issues with the original approach:
- It did not work at all with UEFI because UEFI will reprogram the PCI device
BARs and remap the COM1/COM2 ports at non-legacy addresses.
- OpenBSD GENERIC kernel does not create a /dev/console because it expects
the uart device at the legacy 0x3F8/0x2F8 address to be an ISA device.
- It was functional with a FreeBSD guest but caused the console to appear
on /dev/ttyu2 which was not intuitive.

The uart emulation is now independent of the bus on which it resides. Thus it
is possible to have uart devices on the PCI bus in addition to the legacy
COM1/COM2 devices behind the LPC bus.

The command line option to attach ISA COM1/COM2 ports to a virtual machine is
"-s <bus>,lpc -l com1,stdio".

The command line option to create a PCI-attached uart device is:
"-s <bus>,uart[,stdio]"

The command line option to create PCI-attached COM1/COM2 device is:
"-S <bus>,uart[,stdio]". This style of creating COM ports is deprecated.

Approved by: re (glebius)

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

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

Parse the memory size parameter using expand_number() to allow specifying
the memory size more intuitively (e.g. 512M, 4G etc).

Submitted by: rodrigc
Reviewed by: grehan
Approved by: re (blanket)

Add the "-g <gdport>" option to the vmrun.sh script that enables remote
debugging of the guest via kgdb.

See also: https://wiki.freebsd.org/BHyVe/gdb

Obtained from: NetApp

Add bhyve to examples.

Requested by: alfred, julian
Obtained from: NetApp