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 virtio-net changes.

Re-tested with NetBSD/amd64 5.2.2, 6.1.4 and 7-beta.

r271299:
Add a callback to be notified about negotiated features.

r271338:
Allow vtnet operation without merged rx buffers.

NetBSD's virtio-net implementation doesn't negotiate
the merged rx-buffers feature. To support this, check
to see if the feature was negotiated, and then adjust
the operation of the receive path accordingly by using
a larger iovec, and a smaller rx header.
In addition, ignore writes to the (read-only) status byte.

Approved by: re (glebius)
Obtained from: Vincenzo Maffione, Universita` di Pisa (r271299)

MFC 266424,266476,266524,266573,266595,266626,266627,266633,266641,266642,
266708,266724,266934,266935,268521:
Emulation of the "ins" and "outs" instructions.

Various fixes for translating guest linear addresses to guest physical
addresses.

MFC 264353,264509,264768,264770,264825,264846,264988,265114,265165,265365,
265941,265951,266390,266550,266910:
Various bhyve fixes:
- Don't save host's return address in 'struct vmxctx'.
- Permit non-32-bit accesses to local APIC registers.
- Factor out common ioport handler code.
- Use calloc() in favor of malloc + memset.
- Change the vlapic timer frequency to be in the ballpark of contemporary
hardware.
- Allow the guest to read the TSC via MSR 0x10.
- A VMCS is always inactive when it exits the vmx_run() loop. Remove
redundant code and the misleading comment that suggest otherwise.
- Ignore writes to microcode update MSR. This MSR is accessed by RHEL7
guest.
Add KTR tracepoints to annotate wrmsr and rdmsr VM exits.
- Provide an alias for the userboot console and name it 'comconsole'.
- Use EV_ADD to create an mevent and EV_ENABLE to enable it.
- abort(3) the process in response to a VMEXIT_ABORT.
- Don't include the guest memory segments in the bhyve(8) process core dump.
- Make the vmx asm code dtrace-fbt-friendly.
- Allow vmx_getdesc() and vmx_setdesc() to be called for a vcpu that is in
the VCPU_RUNNING state.
- Enable VMX in the IA32_FEATURE_CONTROL MSR if it not enabled and the MSR
isn't locked.

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 r256926, r257005

r256926
Fix AHCI ATAPI emulation when backed with /dev/cd0

- remove assumption that the backing file/device had
512-byte sectors
- fix incorrect iovec size variable that would result
in a buffer overrun when an o/s issued an i/o request
with more s/g elements than the blockif api

r257005
Export the block size capability to guests.
- Use #defines for capability bits
- Export the VTBLK_F_BLK_SIZE capability
- Fix bug in calculating capacity: it is in
512-byte units, not the underlying sector size

This allows virtio-blk to have backing devices
with non 512-byte sector sizes e.g. /dev/cd0, and
4K-block harddrives.

Approved by: re (glebius)

MFC r256709:

Eliminate unconditional debug printfs.

Linux writes to these nominally read-only registers,
so avoid having bhyve write warning messages to stdout
when the reg writes can be safely ignored. Change the
WPRINTF to DPRINTF which is conditional.

Approved by: re (delphij)

MFC r256389

Implement the virtio block 'get-ident' operation. This eliminates the
annoying verbose boot error of the form

g_handleattr: vtbd0 bio_length 24 len 28 -> EFAULT

The ident returned by bhyve is a text string 'BHYVE-XXXX-XXXX', where
the X's are the first bytes of the md5 hash of the backing filename.

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

Fix incorrect assertion on the minimum side. ZFS would
trigger this.

Reported by: Chris Torek, Allan Jude
Approved by: re@ (blanket)

Fix off-by-1 error in assert.

Submitted by: Tycho Nightingale (tycho.nightingale@pluribusnetworks.com)

Major rework of the virtio code. Split out common parts, and modify
the net/block devices accordingly.

Submitted by: Chris Torek torek at torek dot net
Reviewed by: grehan

Teach the virtio block device to deal with direct as well as indirect
descriptors. Prior to this change the device would only work with guests
that chose to use indirect descriptors.

Modify the device reset callback to actually reset the device state.

Submitted by: Tycho Nightingale (tycho.nightingale@pluribusnetworks.com)

Simplify the assignment of memory to virtual machines by requiring a single
command line option "-m <memsize in MB>" to specify the memory size.

Prior to this change the user needed to explicitly specify the amount of
memory allocated below 4G (-m <lowmem>) and the amount above 4G (-M <highmem>).

The "-M" option is no longer supported by 'bhyveload' and 'bhyve'.

The start of the PCI hole is fixed at 3GB and cannot be directly changed
using command line options. However it is still possible to change this in
special circumstances via the 'vm_set_lowmem_limit()' API provided by
libvmmapi.

Submitted by: Dinakar Medavaram (initial version)
Reviewed by: grehan
Obtained from: NetApp

Simplify virtio ring num-available calculation.

Submitted by: Chris Torek, torek at torek dot net

Specify the length of the mapping requested from 'paddr_guest2host()'.

This seems prudent to do in its own right but it also opens up the possibility
of not having to mmap the entire guest address space in the 'bhyve' process
context.

Discussed with: grehan
Obtained from: NetApp

Ignore the BARRIER flag in the virtio block header.

This capability is not advertised by the host so ignore it even if the guest
insists on setting the flag.

Reviewed by: grehan
Obtained from: NetApp

Add support for MSI-X interrupts in the virtio block device and make that
the default.

The current behavior of advertising a single MSI vector can be requested by
setting the environment variable "BHYVE_USE_MSI" to "yes". The use of MSI
is not compliant with the virtio specification and will be eventually phased
out.

Submitted by: Gopakumar T
Obtained from: NetApp

Add svn properties to the recently merged bhyve source files.

The pre-commit hook will not allow any commits without the svn:keywords
property in head.

Merge projects/bhyve to head.

'bhyve' was developed by grehan@ and myself at NetApp (thanks!).

Special thanks to Peter Snyder, Joe Caradonna and Michael Dexter for their
support and encouragement.

Obtained from: NetApp

Rename fbsdrun.* -> bhyverun.*

bhyve is intended to be a generic hypervisor, and not FreeBSD-specific.

(renaming internal routines will come later)

Reviewed by: neel
Obtained from: NetApp

Determine the correct length and sector size for raw devices.

Obtained from: NetApp
Tested by: Michael Dexter with iscsi LUNs

Rework how guest MMIO regions are dealt with.

- New memory region interface. An RB tree holds the regions,
with a last-found per-vCPU cache to deal with the common case
of repeated guest accesses to MMIO registers in the same page.

- Support memory-mapped BARs in PCI emulation.

mem.c/h - memory region interface

instruction_emul.c/h - remove old region interface.
Use gpa from EPT exit to avoid a tablewalk to
determine operand address. Determine operand size
and use when calling through to region handler.

fbsdrun.c - call into region interface on paging
exit. Distinguish between instruction emul error
and region not found

pci_emul.c/h - implement new BAR callback api.
Split BAR alloc routine into routines that
require/don't require the BAR phys address.

ioapic.c
pci_passthru.c
pci_virtio_block.c
pci_virtio_net.c
pci_uart.c - update to new BAR callback i/f

Reviewed by: neel
Obtained from: NetApp

Allow access to the device's config area with any size i/o access at any
offset. This is now spec-compliant.

First cut to port bhyve, vmmctl, and libvmmapi to HEAD.

Import of bhyve hypervisor and utilities, part 1.
vmm.ko - kernel module for VT-x, VT-d and hypervisor control
bhyve - user-space sequencer and i/o emulation
vmmctl - dump of hypervisor register state
libvmm - front-end to vmm.ko chardev interface

bhyve was designed and implemented by Neel Natu.

Thanks to the following folk from NetApp who helped to make this available:
Joe CaraDonna
Peter Snyder
Jeff Heller
Sandeep Mann
Steve Miller
Brian Pawlowski