MFC r267109, r267179: Update vt(4) "Terminus BSD Console" font

  "Terminus BSD Console" is a derivative of Terminus that is provided
  by Mr. Dimitar Zhekov under the 2-clause BSD license for use by the
  FreeBSD vt(4) console.

  Clarify statement on font origin
MFC r267252, r267253:

  - Remove an unnecessary variable reassignment
  - Fix TSO support on VMware Fusion
MFC 260239,261268,265058:
Expand the support for PCI INTx interrupts including providing interrupt
routing information for INTx interrupts to I/O APIC pins and enabling
INTx interrupts in the virtio and AHCI backends.
MFC 261229:
o Fix typo, sort .Xrs.

PR:		docs/186191
MFC 261503,264501:
Emulate the byte move and zero/sign extend instructions.
MFC 261504:
Add support for FreeBSD/i386 guests under bhyve.
MFC 262311: Fix virtio spec URL.
MFC r267090:

Correct the document date for last change.
Document r266890, pmcstat(8) '-l' flag.

Sponsored by:	The FreeBSD Foundation
MFC r267326, r267327:

r267326:
  Add empty pkg-stage file to CLEANFILES if WITH_DVD=1.

r267327:
  Fix indentation level.

Sponsored by:	The FreeBSD Foundation
MFC 266263,266551,266552:
- Add definitions for more structured extended features as well as
  XSAVE Extended Features for AVX512 and MPX (Memory Protection Extensions).
- Don't permit users to request a subset of the AVX512 or MPX xsave masks.
Fix a typo in note for r266890, pmcstat(8)

Sponsored by:	The FreeBSD Foundation
MFC 261638,262144,262506,266765:
Add virtualized XSAVE support to bhyve which permits guests to use XSAVE and
XSAVE-enabled features like AVX.
- Store a per-cpu guest xcr0 register and handle xsetbv VM exits by emulating
  the instruction.
- Only expose XSAVE to guests if XSAVE is enabled in the host.  Only expose
  a subset of XSAVE features currently supported by the guest and for which
  the proper emulation of xsetbv is known.  Currently this includes X87, SSE,
  AVX, AVX-512, and Intel MPX.
- Add support for injecting hardware exceptions into the guest and use this
  to trigger exceptions in the guest for invalid xsetbv operations instead
  of potentially faulting in the host.
- Queue pending exceptions in the 'struct vcpu' instead of directly updating
  the processor-specific VMCS or VMCB. The pending exception will be delivered
  right before entering the guest.
- Rename the unused ioctl VM_INJECT_EVENT to VM_INJECT_EXCEPTION and restrict
  it to only deliver x86 hardware exceptions. This new ioctl is now used to
  inject a protection fault when the guest accesses an unimplemented MSR.
- Expose a subset of known-safe features from leaf 0 of the structured
  extended features to guests if they are supported on the host including
  RDFSBASE/RDGSBASE, BMI1/2, AVX2, AVX-512, HLE, ERMS, and RTM.  Aside
  from AVX-512, these features are all new instructions available for use
  in ring 3 with no additional hypervisor changes needed.
MFC 262615,262624:
Workaround an apparent bug in VMWare Fusion's nested VT support where it
triggers a VM exit with the exit reason of an external interrupt but
without a valid interrupt set in the exit interrupt information.
MFC r263191:
Add libusb_log_level enum.
MFC: r267185

Minor improvements.
MFC r267162: ktrace: Use designated initializers for the data_lengths array.

In the .o file, this only changes some line numbers (stable/10 amd64)
because element 0 is no longer explicitly initialized.

This should make bugs like FreeBSD-SA-14:12.ktrace less likely.

Discussed with:	des
MFC r267174:

  Fix some rpcgen sample file issues.

PR:	185582
MFC 262139,262140,262236,262281,262532:
Various x2APIC fixes and enhancements:
- Use spinlocks for the vioapic.
- Handle the SELF_IPI MSR.
- Simplify the APIC mode switching between MMIO and x2APIC.  The guest is
  no longer allowed to switch modes at runtime.  Instead, the desired mode
  is set when the virtual machine is created.
- Disallow MMIO access in x2APIC mode and MSR access in xAPIC mode.
- Add support for x2APIC virtualization assist in Intel VT-x.
MFC 262744:
Add SMBIOS support.

A new option, -U, can be used to set the UUID in the System
Information (Type 1) structure.