MFC r302362,r302363,r302364,r302365,r302373:

r302362:

Fix gcc warnings

- Remove -Wunused-but-set-variable (newcpu)
- Always return VMEXIT_CONTINUE as the code always set retval to that value.

r302363:

Fix gcc warnings

Put cfl/prdt under AHCI_DEBUG #defines as they are only used in
those cases.

r302364:

Fix gcc warnings

Add `WRAPPED_CTASSERT` macro by annotating CTASSERTs with __unused
to deal with -Wunused-local-typedefs warnings from gcc 4.8+.
All other compilers (clang, etc) use CTASSERT as-is. A more generic
solution for this issue will be proposed after ^/stable/11 is forked.

Consolidate all CTASSERTs under one block instead of inlining them in
functions.

r302365:

Fix gcc warnings

Remove -Wunused-but-set-variable (`error`). Cast calls with
`(void)` to note that the return value is explicitly ignored.

r302373:

Fix CTASSERT issue in a more clean way

- Replace all CTASSERT macro instances with static_assert's.
- Remove the WRAPPED_CTASSERT macro; it's now an unnecessary obfuscation.
- Localize all static_assert's to the structures being tested.
- Sort some headers per-style(9).

MFC r276428:
Replace bhyve's minimal RTC emulation with a fully featured one in vmm.ko.

MFC r276432:
Initialize all fields of 'struct vm_exception exception' before passing it
to vm_inject_exception().

MFC r276763:
Clear blocking due to STI or MOV SS in the hypervisor when an instruction is
emulated or when the vcpu incurs an exception.

MFC r277149:
Clean up usage of 'struct vm_exception' to only to communicate information
from userspace to vmm.ko when injecting an exception.

MFC r277168:
Fix typo (missing comma).

MFC r277309:
Make the error message explicit instead of just printing the usage if the
virtual machine name is not specified.

MFC r277310:
Simplify instruction restart logic in bhyve.

MFC r277359:
Fix a bug in libvmmapi 'vm_copy_setup()' where it would return success even
if the 'gpa' was in the guest MMIO region.

MFC r277360:
MOVS instruction emulation.

MFC r277626:
Add macro to identify AVIC capability (advanced virtual interrupt controller)
in AMD processors.

MFC r279220:
Don't close a block context if it couldn't be opened avoiding a null deref.

MFC r279225:
Add "-u" option to bhyve(8) to indicate that the RTC should maintain UTC time.

MFC r279227:
Emulate MSR 0xC0011024 when running on AMD processors.

MFC r279228:
Always emulate MSR_PAT on Intel processors and don't rely on PAT save/restore
capability of VT-x. This lets bhyve run nested in older VMware versions that
don't support the PAT save/restore capability.

MFC r279540:
Fix warnings/errors when building vmm.ko with gcc.

MFC r267921, r267934, r267949, r267959, r267966, r268202, r268276,
r268427, r268428, r268521, r268638, r268639, r268701, r268777,
r268889, r268922, r269008, r269042, r269043, r269080, r269094,
r269108, r269109, r269281, r269317, r269700, r269896, r269962,
r269989.

Catch bhyve up to CURRENT.

Lightly tested with FreeBSD i386/amd64, Linux i386/amd64, and
OpenBSD/amd64. Still resolving an issue with OpenBSD/i386.

Many thanks to jhb@ for all the hard work on the prior MFCs !

r267921 - support the "mov r/m8, imm8" instruction
r267934 - document options
r267949 - set DMI vers/date to fixed values
r267959 - doc: sort cmd flags
r267966 - EPT misconf post-mortem info
r268202 - use correct flag for event index
r268276 - 64-bit virtio capability api
r268427 - invalidate guest TLB when cr3 is updated, needed for TSS
r268428 - identify vcpu's operating mode
r268521 - use correct offset in guest logical-to-linear translation
r268638 - chs value
r268639 - chs fake values
r268701 - instr emul operand/address size override prefix support
r268777 - emulation for legacy x86 task switching
r268889 - nested exception support
r268922 - fix INVARIANTS build
r269008 - emulate instructions found in the OpenBSD/i386 5.5 kernel
r269042 - fix fault injection
r269043 - Reduce VMEXIT_RESTARTs in task_switch.c
r269080 - fix issues in PUSH emulation
r269094 - simplify return values from the inout handlers
r269108 - don't return -1 from the push emulation handler
r269109 - avoid permanent sleep in vm_handle_hlt()
r269281 - list VT-x features in base kernel dmesg
r269317 - Mark AHCI fatal errors as not completed
r269700 - Support PCI extended config space in bhyve
r269896 - Minor cleanup
r269962 - use max guest memory when creating IOMMU domain
r269989 - fix interrupt mode names

MFC 263432,265366,265376:
Fixes for vcpu management in bhyve:
- Use 'cpuset_t' to represent the vcpus active in a virtual machine.
- Modify the "-p" option to be more flexible when associating a 'vcpu' with
a 'hostcpu'.

MFC 262744:
Add SMBIOS support.

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

MFC r256645.

Add a new capability, VM_CAP_ENABLE_INVPCID, that can be enabled to expose
'invpcid' instruction to the guest. Currently bhyve will try to enable this
capability unconditionally if it is available.

Consolidate code in bhyve to set the capabilities so it is no longer
duplicated in BSP and AP bringup.

Add a sysctl 'vm.pmap.invpcid_works' to display whether the 'invpcid'
instruction is available.

Approved by: re (hrs)

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 r276428:
Replace bhyve's minimal RTC emulation with a fully featured one in vmm.ko.

MFC r276432:
Initialize all fields of 'struct vm_exception exception' before passing it
to vm_inject_exception().

MFC r276763:
Clear blocking due to STI or MOV SS in the hypervisor when an instruction is
emulated or when the vcpu incurs an exception.

MFC r277149:
Clean up usage of 'struct vm_exception' to only to communicate information
from userspace to vmm.ko when injecting an exception.

MFC r277168:
Fix typo (missing comma).

MFC r277309:
Make the error message explicit instead of just printing the usage if the
virtual machine name is not specified.

MFC r277310:
Simplify instruction restart logic in bhyve.

MFC r277359:
Fix a bug in libvmmapi 'vm_copy_setup()' where it would return success even
if the 'gpa' was in the guest MMIO region.

MFC r277360:
MOVS instruction emulation.

MFC r277626:
Add macro to identify AVIC capability (advanced virtual interrupt controller)
in AMD processors.

MFC r279220:
Don't close a block context if it couldn't be opened avoiding a null deref.

MFC r279225:
Add "-u" option to bhyve(8) to indicate that the RTC should maintain UTC time.

MFC r279227:
Emulate MSR 0xC0011024 when running on AMD processors.

MFC r279228:
Always emulate MSR_PAT on Intel processors and don't rely on PAT save/restore
capability of VT-x. This lets bhyve run nested in older VMware versions that
don't support the PAT save/restore capability.

MFC r279540:
Fix warnings/errors when building vmm.ko with gcc.

MFC r267921, r267934, r267949, r267959, r267966, r268202, r268276,
r268427, r268428, r268521, r268638, r268639, r268701, r268777,
r268889, r268922, r269008, r269042, r269043, r269080, r269094,
r269108, r269109, r269281, r269317, r269700, r269896, r269962,
r269989.

Catch bhyve up to CURRENT.

Lightly tested with FreeBSD i386/amd64, Linux i386/amd64, and
OpenBSD/amd64. Still resolving an issue with OpenBSD/i386.

Many thanks to jhb@ for all the hard work on the prior MFCs !

r267921 - support the "mov r/m8, imm8" instruction
r267934 - document options
r267949 - set DMI vers/date to fixed values
r267959 - doc: sort cmd flags
r267966 - EPT misconf post-mortem info
r268202 - use correct flag for event index
r268276 - 64-bit virtio capability api
r268427 - invalidate guest TLB when cr3 is updated, needed for TSS
r268428 - identify vcpu's operating mode
r268521 - use correct offset in guest logical-to-linear translation
r268638 - chs value
r268639 - chs fake values
r268701 - instr emul operand/address size override prefix support
r268777 - emulation for legacy x86 task switching
r268889 - nested exception support
r268922 - fix INVARIANTS build
r269008 - emulate instructions found in the OpenBSD/i386 5.5 kernel
r269042 - fix fault injection
r269043 - Reduce VMEXIT_RESTARTs in task_switch.c
r269080 - fix issues in PUSH emulation
r269094 - simplify return values from the inout handlers
r269108 - don't return -1 from the push emulation handler
r269109 - avoid permanent sleep in vm_handle_hlt()
r269281 - list VT-x features in base kernel dmesg
r269317 - Mark AHCI fatal errors as not completed
r269700 - Support PCI extended config space in bhyve
r269896 - Minor cleanup
r269962 - use max guest memory when creating IOMMU domain
r269989 - fix interrupt mode names

MFC 263432,265366,265376:
Fixes for vcpu management in bhyve:
- Use 'cpuset_t' to represent the vcpus active in a virtual machine.
- Modify the "-p" option to be more flexible when associating a 'vcpu' with
a 'hostcpu'.

MFC 262744:
Add SMBIOS support.

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

MFC r256645.

Add a new capability, VM_CAP_ENABLE_INVPCID, that can be enabled to expose
'invpcid' instruction to the guest. Currently bhyve will try to enable this
capability unconditionally if it is available.

Consolidate code in bhyve to set the capabilities so it is no longer
duplicated in BSP and AP bringup.

Add a sysctl 'vm.pmap.invpcid_works' to display whether the 'invpcid'
instruction is available.

Approved by: re (hrs)

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)