MFC r302460: Add emulation for multiple (up to 16) MSI vectors for AHCI.

It was useless before, but may improve performance now if multiple devices
are configured and guest supports this feature.

Sponsored by: iXsystems, Inc.

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 297932,298295:
Improvements for PCI passthru devices.

297932:
Handle PBA that shares a page with MSI-X table for passthrough devices.

If the PBA shares a page with the MSI-X table, map the shared page via
/dev/mem and emulate accesses to the portion of the PBA in the shared
page by accessing the mapped page.

298295:
Always emit an error message on passthru configuration errors.

Previously, many errors (such as the PCI device not being attached
to the ppt(4) driver) resulted in bhyve silently exiting without
starting the virtual machine. Now any errors encountered when
configuring a virtual slot for a PCI passthru device should be noted
on stderr.

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 266125:
Implement a PCI interrupt router to route PCI legacy INTx interrupts to
the legacy 8259A PICs.

MFC 261904,261905,262143,262184,264921,265211,267169,267292,267294:
Various PCI fixes:
- Allow PCI devices to be configured on all valid bus numbers from 0 to 255.
- Tweak the handling of PCI capabilities in emulated devices to remove
the non-standard zero capability list terminator.
- Add a check to validate that memory BARs of passthru devices are 4KB
aligned.
- Respect and track the enable bit in the PCI configuration address word.
- Handle quad-word access to 32-bit register pairs.

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 261217:
Remove support for legacy PCI devices. These haven't been needed since
support for LPC uart devices was added and it conflicts with upcoming
patches to add PCI INTx support.

Approved by: grehan

MFC 258859,259081,259085,259205,259213,259275,259482,259537,259702,259779:
Several changes to the local APIC support in bhyve:
- Rename 'vm_interrupt_hostcpu()' to 'vcpu_notify_event()'.
- If a vcpu disables its local apic and then executes a 'HLT' then spin
down the vcpu and destroy its thread context. Also modify the 'HLT'
processing to ignore pending interrupts in the IRR if interrupts have
been disabled by the guest. The interrupt cannot be injected into the
guest in any case so resuming it is futile.
- Use callout(9) to drive the vlapic timer instead of clocking it on each
VM exit.
- When the guest is bringing up the APs in the x2APIC mode a write to the
ICR register will now trigger a return to userspace with an exitcode of
VM_EXITCODE_SPINUP_AP.
- Change the vlapic timer lock to be a spinlock because the vlapic can be
accessed from within a critical section (vm run loop) when guest is using
x2apic mode.
- Fix the vlapic version register.
- Add a command to bhyvectl to inject an NMI on a specific vcpu.
- Add an API to deliver message signalled interrupts to vcpus. This allows
callers to treat the MSI 'addr' and 'data' fields as opaque and also lets
bhyve implement multiple destination modes: physical, flat and clustered.
- Rename the ambiguously named 'vm_setup_msi()' and 'vm_setup_msix()' to
'vm_setup_pptdev_msi()' and 'vm_setup_pptdev_msix()' respectively.
- Consolidate the virtual apic initialization in a single function:
vlapic_reset()
- Add a generic routine to trigger an LVT interrupt that supports both
fixed and NMI delivery modes.
- Add an ioctl and bhyvectl command to trigger local interrupts inside a
guest. In particular, a global NMI similar to that raised by SERR# or
PERR# can be simulated by asserting LINT1 on all vCPUs.
- Extend the LVT table in the vCPU local APIC to support CMCI.
- Flesh out the local APIC error reporting a bit to cache errors and
report them via ESR when ESR is written to. Add support for asserting
the error LVT when an error occurs. Raise illegal vector errors when
attempting to signal an invalid vector for an interrupt or when sending
an IPI.
- Export table entries in the MADT and MP Table advertising the stock x86
config of LINT0 set to ExtInt and LINT1 wired to NMI.

MFC 260206:
Rework the DSDT generation code a bit to generate more accurate info about
LPC devices. Among other things, the LPC serial ports now appear as
ACPI devices.

MFC 257422,257661,258075,258476,258494,258579,258609,258699:
Several enhancements to the I/O APIC support in bhyve including:
- Move the I/O APIC device model from userspace into vmm.ko and add
ioctls to assert and deassert I/O APIC pins.
- Add HPET device emulation including a single timer block with 8 timers.
- Remove the 'vdev' abstraction.

Approved by: neel

MFC r257293.

Add support for PCI-to-ISA LPC bridge emulation. If the LPC bus is attached
to a virtual machine then we implicitly create COM1 and COM2 ISA devices.

Prior to this change the only way of attaching a COM port to the virtual
machine was by presenting it as a PCI device that is mapped at the legacy
I/O address 0x3F8 or 0x2F8.

There were some issues with the original approach:
- It did not work at all with UEFI because UEFI will reprogram the PCI device
BARs and remap the COM1/COM2 ports at non-legacy addresses.
- OpenBSD GENERIC kernel does not create a /dev/console because it expects
the uart device at the legacy 0x3F8/0x2F8 address to be an ISA device.
- It was functional with a FreeBSD guest but caused the console to appear
on /dev/ttyu2 which was not intuitive.

The uart emulation is now independent of the bus on which it resides. Thus it
is possible to have uart devices on the PCI bus in addition to the legacy
COM1/COM2 devices behind the LPC bus.

The command line option to attach ISA COM1/COM2 ports to a virtual machine is
"-s <bus>,lpc -l com1,stdio".

The command line option to create a PCI-attached uart device is:
"-s <bus>,uart[,stdio]"

The command line option to create PCI-attached COM1/COM2 device is:
"-S <bus>,uart[,stdio]". This style of creating COM ports is deprecated.

Approved by: re (glebius)

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 266125:
Implement a PCI interrupt router to route PCI legacy INTx interrupts to
the legacy 8259A PICs.

MFC 261904,261905,262143,262184,264921,265211,267169,267292,267294:
Various PCI fixes:
- Allow PCI devices to be configured on all valid bus numbers from 0 to 255.
- Tweak the handling of PCI capabilities in emulated devices to remove
the non-standard zero capability list terminator.
- Add a check to validate that memory BARs of passthru devices are 4KB
aligned.
- Respect and track the enable bit in the PCI configuration address word.
- Handle quad-word access to 32-bit register pairs.

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 261217:
Remove support for legacy PCI devices. These haven't been needed since
support for LPC uart devices was added and it conflicts with upcoming
patches to add PCI INTx support.

Approved by: grehan

MFC 258859,259081,259085,259205,259213,259275,259482,259537,259702,259779:
Several changes to the local APIC support in bhyve:
- Rename 'vm_interrupt_hostcpu()' to 'vcpu_notify_event()'.
- If a vcpu disables its local apic and then executes a 'HLT' then spin
down the vcpu and destroy its thread context. Also modify the 'HLT'
processing to ignore pending interrupts in the IRR if interrupts have
been disabled by the guest. The interrupt cannot be injected into the
guest in any case so resuming it is futile.
- Use callout(9) to drive the vlapic timer instead of clocking it on each
VM exit.
- When the guest is bringing up the APs in the x2APIC mode a write to the
ICR register will now trigger a return to userspace with an exitcode of
VM_EXITCODE_SPINUP_AP.
- Change the vlapic timer lock to be a spinlock because the vlapic can be
accessed from within a critical section (vm run loop) when guest is using
x2apic mode.
- Fix the vlapic version register.
- Add a command to bhyvectl to inject an NMI on a specific vcpu.
- Add an API to deliver message signalled interrupts to vcpus. This allows
callers to treat the MSI 'addr' and 'data' fields as opaque and also lets
bhyve implement multiple destination modes: physical, flat and clustered.
- Rename the ambiguously named 'vm_setup_msi()' and 'vm_setup_msix()' to
'vm_setup_pptdev_msi()' and 'vm_setup_pptdev_msix()' respectively.
- Consolidate the virtual apic initialization in a single function:
vlapic_reset()
- Add a generic routine to trigger an LVT interrupt that supports both
fixed and NMI delivery modes.
- Add an ioctl and bhyvectl command to trigger local interrupts inside a
guest. In particular, a global NMI similar to that raised by SERR# or
PERR# can be simulated by asserting LINT1 on all vCPUs.
- Extend the LVT table in the vCPU local APIC to support CMCI.
- Flesh out the local APIC error reporting a bit to cache errors and
report them via ESR when ESR is written to. Add support for asserting
the error LVT when an error occurs. Raise illegal vector errors when
attempting to signal an invalid vector for an interrupt or when sending
an IPI.
- Export table entries in the MADT and MP Table advertising the stock x86
config of LINT0 set to ExtInt and LINT1 wired to NMI.

MFC 260206:
Rework the DSDT generation code a bit to generate more accurate info about
LPC devices. Among other things, the LPC serial ports now appear as
ACPI devices.

MFC 257422,257661,258075,258476,258494,258579,258609,258699:
Several enhancements to the I/O APIC support in bhyve including:
- Move the I/O APIC device model from userspace into vmm.ko and add
ioctls to assert and deassert I/O APIC pins.
- Add HPET device emulation including a single timer block with 8 timers.
- Remove the 'vdev' abstraction.

Approved by: neel

MFC r257293.

Add support for PCI-to-ISA LPC bridge emulation. If the LPC bus is attached
to a virtual machine then we implicitly create COM1 and COM2 ISA devices.

Prior to this change the only way of attaching a COM port to the virtual
machine was by presenting it as a PCI device that is mapped at the legacy
I/O address 0x3F8 or 0x2F8.

There were some issues with the original approach:
- It did not work at all with UEFI because UEFI will reprogram the PCI device
BARs and remap the COM1/COM2 ports at non-legacy addresses.
- OpenBSD GENERIC kernel does not create a /dev/console because it expects
the uart device at the legacy 0x3F8/0x2F8 address to be an ISA device.
- It was functional with a FreeBSD guest but caused the console to appear
on /dev/ttyu2 which was not intuitive.

The uart emulation is now independent of the bus on which it resides. Thus it
is possible to have uart devices on the PCI bus in addition to the legacy
COM1/COM2 devices behind the LPC bus.

The command line option to attach ISA COM1/COM2 ports to a virtual machine is
"-s <bus>,lpc -l com1,stdio".

The command line option to create a PCI-attached uart device is:
"-s <bus>,uart[,stdio]"

The command line option to create PCI-attached COM1/COM2 device is:
"-S <bus>,uart[,stdio]". This style of creating COM ports is deprecated.

Approved by: re (glebius)