[PATCH v2 0/33] KVM: MIPS: Add VZ support

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This series is based on v4.11-rc2.
My hope is to take this series via the MIPS KVM tree for 4.12, possibly
with a topic branch containing the MIPS architecture changes (patches
1-6).

This series implements basic support for the MIPS Virtualization Module
(generally known as VZ) in KVM, which adds a new "guest" processor mode
with a partial guest Cop0 state and guest TLB to complement the existing
"root" (host) modes & state, allowing for far fewer traps to the
hypervisor compared to the existing Trap & Emulate implementation of KVM
for MIPS, as well as fully virtualizing the guest virtual memory space
to run unmodified kernels.

The MIPS32 and MIPS64 VZ architecture documentation can be found here:
http://wiki.prplfoundation.org/w/images/f/fd/MD00846-2B-VZMIPS32-AFP-01.06.pdf
http://wiki.prplfoundation.org/w/images/f/fe/MD00847-2B-VZMIPS64-AFP-01.06.pdf

We primarily support the ImgTec P5600, P6600, and I6400 cores so far,
including the following VZ / guest hardware features:
- MIPS32 and MIPS64, r5 (VZ requires r5 or later) and r6
- TLBs with GuestID (IMG cores) or Root ASID Dealias (Octeon III)
- Shared physical root/guest TLB (IMG cores)
- FPU / MSA
- Cop0 timer (up to 1GHz for now due to soft timer limit)
- Segmentation control (EVA)
- Hardware page table walker (HTW) both for root and guest TLB

Limitations:
- Support for Cavium Octeon III will follow shortly in a separate series
- Perf counters and watch registers not exposed to guest in this series
  (the patches require some further cleanup)
- Guest microMIPS not supported yet (e.g. M5150)
- Guest XPA not supported yet (e.g. P5600)

We start with some preliminary MIPS changes in patches 1-6, including
some MAAR definition refactoring for XPA and some new guest capabilities
and accessors.

Patches 7-17 make preliminary VZ changes in KVM, including 64-bit MMIO
support, the VZ, TE and 64BIT KVM capabilities, and new implementation
callbacks used by the VZ implementation.

Patches 18-23 get into some meatier KVM changes for VZ, such as
abstracting guest register access for common code and adding VZ entry
and TLB management code.

Patches 24-25 add the bulk of the core VZ support and enable it in the
build system.

Patches 26-31 then go on to implement support for various optional
architectural features, such as segmentation control (EVA) and hardware
page table walkers (HTW). Context switching of the guest state may be
incomplete on certain cores without these patches if the features in
question can't be disabled in the guest context.

Finally patches 32-33 implement support for features that can be easily
disabled at runtime, namely the hardware guest timer (which can be
emulated in software before patch 32) and tracing of guest mode changes
using VZ's CP0_GuestCtl0.MC bit.

Changes in v2:
- Drop KVM_VM_MIPS_DEFAULT (Paolo)
- Make various VZ handler functions static
- Add KVM_CAP_MIPS_TE capability so that userland can determine whether
  T&E is available when VZ is also available.
- Fix section number in API documentation for 64BIT capability, which
  was accidentally left unchanged after a rebase on the KVM changes for
  v4.11.
- Patch 1 of hypercall series incorporated into this series.

Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: "Radim Krčmář" <rkrcmar@xxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Andreas Herrmann <andreas.herrmann@xxxxxxxxxxxxxxxxxx>
Cc: David Daney <david.daney@xxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Paul Burton <paul.burton@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx

James Hogan (33):
  MIPS: Add defs & probing of UFR
  MIPS: Separate MAAR V bit into VL and VH for XPA
  MIPS: Probe guest CP0_UserLocal
  MIPS: Probe guest MVH
  MIPS: Add some missing guest CP0 accessors & defs
  MIPS: asm/tlb.h: Add UNIQUE_GUEST_ENTRYHI() macro
  KVM: MIPS: Implement HYPCALL emulation
  KVM: MIPS/Emulate: De-duplicate MMIO emulation
  KVM: MIPS/Emulate: Implement 64-bit MMIO emulation
  KVM: MIPS: Update kvm_lose_fpu() for VZ
  KVM: MIPS: Extend counters & events for VZ GExcCodes
  KVM: MIPS: Add VZ & TE capabilities
  KVM: MIPS: Add 64BIT capability
  KVM: MIPS: Init timer frequency from callback
  KVM: MIPS: Add callback to check extension
  KVM: MIPS: Add hardware_{enable,disable} callback
  KVM: MIPS: Add guest exit exception callback
  KVM: MIPS: Abstract guest CP0 register access for VZ
  KVM: MIPS/Entry: Update entry code to support VZ
  KVM: MIPS/TLB: Add VZ TLB management
  KVM: MIPS/Emulate: Update CP0_Compare emulation for VZ
  KVM: MIPS/Emulate: Drop CACHE emulation for VZ
  KVM: MIPS: Update exit handler for VZ
  KVM: MIPS: Implement VZ support
  KVM: MIPS: Add VZ support to build system
  KVM: MIPS/VZ: Support guest CP0_BadInstr[P]
  KVM: MIPS/VZ: Support guest CP0_[X]ContextConfig
  KVM: MIPS/VZ: Support guest segmentation control
  KVM: MIPS/VZ: Support guest hardware page table walker
  KVM: MIPS/VZ: Support guest load-linked bit
  KVM: MIPS/VZ: Emulate MAARs when necessary
  KVM: MIPS/VZ: Support hardware guest timer
  KVM: MIPS/VZ: Trace guest mode changes

 Documentation/virtual/kvm/api.txt        |   90 +-
 Documentation/virtual/kvm/hypercalls.txt |    5 +-
 arch/mips/include/asm/cpu-features.h     |   10 +-
 arch/mips/include/asm/cpu-info.h         |    2 +-
 arch/mips/include/asm/cpu.h              |    1 +-
 arch/mips/include/asm/kvm_host.h         |  467 ++-
 arch/mips/include/asm/maar.h             |   10 +-
 arch/mips/include/asm/mipsregs.h         |   24 +-
 arch/mips/include/asm/tlb.h              |    6 +-
 arch/mips/include/uapi/asm/inst.h        |    2 +-
 arch/mips/include/uapi/asm/kvm.h         |   20 +-
 arch/mips/kernel/cpu-probe.c             |   13 +-
 arch/mips/kernel/time.c                  |    1 +-
 arch/mips/kvm/Kconfig                    |   28 +-
 arch/mips/kvm/Makefile                   |    9 +-
 arch/mips/kvm/emulate.c                  |  373 +--
 arch/mips/kvm/entry.c                    |  132 +-
 arch/mips/kvm/hypcall.c                  |   53 +-
 arch/mips/kvm/interrupt.h                |    5 +-
 arch/mips/kvm/mips.c                     |  120 +-
 arch/mips/kvm/mmu.c                      |   20 +-
 arch/mips/kvm/tlb.c                      |  411 +++-
 arch/mips/kvm/trace.h                    |   74 +-
 arch/mips/kvm/trap_emul.c                |   65 +-
 arch/mips/kvm/vz.c                       | 3133 +++++++++++++++++++++++-
 arch/mips/mm/init.c                      |    2 +-
 include/uapi/linux/kvm.h                 |    7 +-
 27 files changed, 4764 insertions(+), 319 deletions(-)
 create mode 100644 arch/mips/kvm/hypcall.c
 create mode 100644 arch/mips/kvm/vz.c

-- 
git-series 0.8.10



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