bhyve: add bootindex option for several devices

[corvink]

Summary

The bootindex option is used to specify the boot order. If no device
uses the bootindex option, the boot order will be determined by the
firmware. If one or more devices specify a bootindex, the first bootable
device with the lowest bootindex will be booted. It's not garanteed
that devices without a bootindex will be recognized as bootable from the
firmware in that case.

[jhb]

usr.sbin/bhyve/block_if.c

478

()'s around return value

usr.sbin/bhyve/pci_ahci.c

2479

Trailing whitespace?

[corvink]

• fix style issues

[corvink]

@jhb @markj Any comments on this patch stack?

[markj]

The documentation should explain that "bootorder" is just a qemu_fwcfg variable, and it's up to the guest firmware to do something with it.

usr.sbin/bhyve/block_if.c

69

Redundant include.

usr.sbin/bhyve/pci_virtio_scsi.c

716

sc is leaked here.