MFC r282209:
Emulate the 'bit test' instruction.

MFC r282259:
Re-implement RTC current time calculation to eliminate the possibility of
losing time.

MFC r282281:
Advertise the MTRR feature via CPUID and emulate the minimal set of MTRR MSRs.

MFC r282284:
When an instruction cannot be decoded just return to userspace so bhyve(8)
can dump the instruction bytes.

MFC r282287:
Don't require <sys/cpuset.h> to be always included before <machine/vmm.h>.

MFC r282296:
Emulate MSR_SYSCFG which is accessed by Linux on AMD cpus when MTRRs are
enabled.

MFC r282301:
Relax limits when transitioning a vector from the IRR to the ISR and also
when extinguishing it from the ISR in response to an EOI.

MFC r282335:
Advertise an additional memory BAR in the "dummy" device emulation.

MFC r282336:
Emulate machine check related MSRs to allow guest OSes like Windows to boot.

MFC r282351:
Don't advertise the Intel SMX capability to the guest.

MFC r282407:
Emulate the 'CMP r/m8, imm8' instruction.

MFC r282519:
Add macros for AMD-specific bits in MSR_EFER: LMSLE, FFXSR and TCE.

MFC r282520:
Emulate guest writes to EFER_MSR properly.

MFC r282558:
Deprecate the 3-way return values from vm_gla2gpa() and vm_copy_setup().

MFC r282571:
Check 'td_owepreempt' and yield the vcpu thread if it is set.

MFC r282595:
Allow byte reads of AHCI registers.

MFC r282784:
Handling indirect descriptors is a capability of the host and not one that
needs to be negotiated. Use the host capabilities field and not the negotiated
field when verifying that indirect descriptors are supported.

MFC r282788:
Allow configuration of the sector size advertised to the guest.

MFC r282865:
Set the subvendor field in config space to the vendor ID. This is required
by the Windows virtio drivers to correctly match a device.

MFC r282922:
Bump the size of the blockif scatter-gather list to 67.

MFC r283075:
Fix off-by-one in array index bounds check. bhyveload would allow you to
create 33 entries on an array that only has 32 slots

MFC r283168:
Temporarily revert r282922 which bumped the max descriptors.

MFC r283255:
Emulate the "CMP r/m, reg" instruction (opcode 39H).

MFC r283256:
Add an option "--get-vmcs-exit-inst-length" to display the instruction length
of the instruction that caused the VM-exit.

MFC r283264:
Change the header type of the emulated host-bridge from type 1 to type 0.

MFC r283293:
Don't rely on the 'VM-exit instruction length' field in the VMCS to always
have an accurate length on an EPT violation.

MFC r283299:
Remove bogus verification of instruction length after instruction decode.

MFC r283308:
Exceptions don't deliver an error code in real mode.

MFC r283657:
Fix non-deterministic delays when accessing a vcpu that was in "running" or
"sleeping" state.

MFC r283973:
Use tunable 'hw.vmm.svm.features' to disable specific SVM features even
though they might be available in hardware. Use tunable 'hw.vmm.svm.num_asids'
to limit the number of ASIDs used by the hypervisor.

MFC r284046:
Fix regression in 'verify_gla()' with the RIP-relative addressing mode.

MFC r284174:
Support guest writes to the TSC by enabling the "use TSC offsetting"
execution control.

MFC r279444:
Allow passthrough devices to be hinted.

MFC r279683:
When ICW1 is issued the edge sense circuit is reset which means that
following an initialization a low-to-high transistion is necesary to
generate an interrupt.

MFC r279925:
Add -p parameter to list PCI device to pass through to the guest.

MFC r281559:
Fix handling of BUS_PROBE_NOWILDCARD in 'device_probe_child()'.

MFC r280447:
When fetching an instruction in non-64bit mode, consider the value of the
code segment base address.

MFC r280725:
Move legacy interrupt allocation for virtio devices to common code.

MFC r280775:
Fix the RTC device model to operate correctly in 12-hour mode.

MFC r280929:
Fix "MOVS" instruction memory to MMIO emulation.

MFC r280968:
Display instruction bytes and %rip prior to aborting due to an instruction
emulation error.

MFC r281145:
Enhance the support for Group 1 Extended opcodes for CMP, AND, OR instructions.

MFC r281542:
Initialize 'error' before use (Coverity IDs 1249748, 1249747, 1249751, 1249749)

MFC r281561:
Prior to aborting due to an ioport error, it is always interesting to see what
the guest's %rip is.

MFC r281611:
If the number of guest vcpus is less than '1' then flag it as an error.

MFC r281612:
Prefer 'vcpu_should_yield()' over checking 'curthread->td_flags' directly.

MFC r281630:
Relax the check on which vectors can be delivered through the APIC. According
to the Intel SDM vectors 16 through 255 are allowed to be delivered via the
local APIC.

MFC r281879:
Missing break in switch case (Coverity ID 1292499)

MFC r281946:
Don't allow guest to modify readonly bits in the PCI config 'status' register.

MFC r281987:
STOS/STOSB/STOSW/STOSD/STOSQ instruction emulation.

MFC r282206:
Implement the century byte in the RTC.

MFC r273375
Add support AMD processors with the SVM/AMD-V hardware extensions.

MFC r273749
Remove bhyve SVM feature printf's now that they are available in the general
CPU feature detection code.

MFC r273766
Add missing 'break' pointed out by Coverity CID 1249760.

MFC r276098
Allow ktr(4) tracing of all guest exceptions via the tunable "hw.vmm.trace_guest_exceptions"

MFC r276392
Inject #UD into the guest when it executes either 'MONITOR' or 'MWAIT' on an
AMD/SVM host.

MFC r276402
Remove "svn:mergeinfo" property that was dragged along when these files were
svn copied in r273375.

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 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 261504:
Add support for FreeBSD/i386 guests under bhyve.

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 r282209:
Emulate the 'bit test' instruction.

MFC r282259:
Re-implement RTC current time calculation to eliminate the possibility of
losing time.

MFC r282281:
Advertise the MTRR feature via CPUID and emulate the minimal set of MTRR MSRs.

MFC r282284:
When an instruction cannot be decoded just return to userspace so bhyve(8)
can dump the instruction bytes.

MFC r282287:
Don't require <sys/cpuset.h> to be always included before <machine/vmm.h>.

MFC r282296:
Emulate MSR_SYSCFG which is accessed by Linux on AMD cpus when MTRRs are
enabled.

MFC r282301:
Relax limits when transitioning a vector from the IRR to the ISR and also
when extinguishing it from the ISR in response to an EOI.

MFC r282335:
Advertise an additional memory BAR in the "dummy" device emulation.

MFC r282336:
Emulate machine check related MSRs to allow guest OSes like Windows to boot.

MFC r282351:
Don't advertise the Intel SMX capability to the guest.

MFC r282407:
Emulate the 'CMP r/m8, imm8' instruction.

MFC r282519:
Add macros for AMD-specific bits in MSR_EFER: LMSLE, FFXSR and TCE.

MFC r282520:
Emulate guest writes to EFER_MSR properly.

MFC r282558:
Deprecate the 3-way return values from vm_gla2gpa() and vm_copy_setup().

MFC r282571:
Check 'td_owepreempt' and yield the vcpu thread if it is set.

MFC r282595:
Allow byte reads of AHCI registers.

MFC r282784:
Handling indirect descriptors is a capability of the host and not one that
needs to be negotiated. Use the host capabilities field and not the negotiated
field when verifying that indirect descriptors are supported.

MFC r282788:
Allow configuration of the sector size advertised to the guest.

MFC r282865:
Set the subvendor field in config space to the vendor ID. This is required
by the Windows virtio drivers to correctly match a device.

MFC r282922:
Bump the size of the blockif scatter-gather list to 67.

MFC r283075:
Fix off-by-one in array index bounds check. bhyveload would allow you to
create 33 entries on an array that only has 32 slots

MFC r283168:
Temporarily revert r282922 which bumped the max descriptors.

MFC r283255:
Emulate the "CMP r/m, reg" instruction (opcode 39H).

MFC r283256:
Add an option "--get-vmcs-exit-inst-length" to display the instruction length
of the instruction that caused the VM-exit.

MFC r283264:
Change the header type of the emulated host-bridge from type 1 to type 0.

MFC r283293:
Don't rely on the 'VM-exit instruction length' field in the VMCS to always
have an accurate length on an EPT violation.

MFC r283299:
Remove bogus verification of instruction length after instruction decode.

MFC r283308:
Exceptions don't deliver an error code in real mode.

MFC r283657:
Fix non-deterministic delays when accessing a vcpu that was in "running" or
"sleeping" state.

MFC r283973:
Use tunable 'hw.vmm.svm.features' to disable specific SVM features even
though they might be available in hardware. Use tunable 'hw.vmm.svm.num_asids'
to limit the number of ASIDs used by the hypervisor.

MFC r284046:
Fix regression in 'verify_gla()' with the RIP-relative addressing mode.

MFC r284174:
Support guest writes to the TSC by enabling the "use TSC offsetting"
execution control.

MFC r279444:
Allow passthrough devices to be hinted.

MFC r279683:
When ICW1 is issued the edge sense circuit is reset which means that
following an initialization a low-to-high transistion is necesary to
generate an interrupt.

MFC r279925:
Add -p parameter to list PCI device to pass through to the guest.

MFC r281559:
Fix handling of BUS_PROBE_NOWILDCARD in 'device_probe_child()'.

MFC r280447:
When fetching an instruction in non-64bit mode, consider the value of the
code segment base address.

MFC r280725:
Move legacy interrupt allocation for virtio devices to common code.

MFC r280775:
Fix the RTC device model to operate correctly in 12-hour mode.

MFC r280929:
Fix "MOVS" instruction memory to MMIO emulation.

MFC r280968:
Display instruction bytes and %rip prior to aborting due to an instruction
emulation error.

MFC r281145:
Enhance the support for Group 1 Extended opcodes for CMP, AND, OR instructions.

MFC r281542:
Initialize 'error' before use (Coverity IDs 1249748, 1249747, 1249751, 1249749)

MFC r281561:
Prior to aborting due to an ioport error, it is always interesting to see what
the guest's %rip is.

MFC r281611:
If the number of guest vcpus is less than '1' then flag it as an error.

MFC r281612:
Prefer 'vcpu_should_yield()' over checking 'curthread->td_flags' directly.

MFC r281630:
Relax the check on which vectors can be delivered through the APIC. According
to the Intel SDM vectors 16 through 255 are allowed to be delivered via the
local APIC.

MFC r281879:
Missing break in switch case (Coverity ID 1292499)

MFC r281946:
Don't allow guest to modify readonly bits in the PCI config 'status' register.

MFC r281987:
STOS/STOSB/STOSW/STOSD/STOSQ instruction emulation.

MFC r282206:
Implement the century byte in the RTC.

MFC r273375
Add support AMD processors with the SVM/AMD-V hardware extensions.

MFC r273749
Remove bhyve SVM feature printf's now that they are available in the general
CPU feature detection code.

MFC r273766
Add missing 'break' pointed out by Coverity CID 1249760.

MFC r276098
Allow ktr(4) tracing of all guest exceptions via the tunable "hw.vmm.trace_guest_exceptions"

MFC r276392
Inject #UD into the guest when it executes either 'MONITOR' or 'MWAIT' on an
AMD/SVM host.

MFC r276402
Remove "svn:mergeinfo" property that was dragged along when these files were
svn copied in r273375.

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 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 261504:
Add support for FreeBSD/i386 guests under bhyve.

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)