[PATCH v5 00/13] KVM/ARM Implementation

[Christoffer Dall <c.dall@virtualopensystems.com>]

The following series implements KVM support for ARM processors,
specifically on the Cortex A-15 platform.

The patch series applies to commit 0ec4044a029b5ba9ed6dc7c52390c25da717e184
on Catalin Marinas' linux-arm-arch tree.

This is Version 5 of the patch series, but the first two versions
were reviewed outside of the KVM mailing list. Changes can also be
pulled from:
 git://github.com/virtualopensystems/linux-kvm-arm.git kvm-a15-v5

The implementation is broken up into a logical set of patches, the first
one containing a skeleton of files, makefile changes, the basic user
space interface and KVM architecture specific stubs.  Subsequent patches
implement parts of the system as listed:
 1.  Skeleton
 2.  Identity Mapping for Hyp mode
 3.  Hypervisor initialization
 4.  Memory virtualization setup (hyp mode mappings and 2nd stage)
 5.  Inject IRQs and FIQs from userspace
 6.  World-switch implementation and Hyp exception vectors
 7.  Emulation framework and CP15 emulation
 8.  Handle guest user memory aborts
 9.  Handle guest MMIO aborts
 10. Support guest wait-for-interrupt instructions.
 11. Initial SMP host support (incomplete!)
 12. Fix guest view of MPIDR
 13. Initial SMP guest support (incomplete!)

Testing:
Limited testing, but have run GCC inside guest, which compiled a small
hello-world program, which was successfully run. Hardware still
unavailable, so all testing has been done on ARM Fast Models.

For a guide on how to set up a testing environment and try out these
patches, see:
 http://www.virtualopensystems.com/media/pdf/kvm-arm-guide.pdf
 https://wiki.linaro.org/PeterMaydell/A15OnFastModels

Still on the to-do list:
 - Reuse VMIDs
 - Fix SMP host support
 - Fix SMP guest support
 - Support guest Thumb mode for MMIO emulation
 - Further testing
 - Performance improvements

Changes since v4:
 - Addressed reviewer comments from v4
    * cleanup debug and trace code
    * remove printks
    * fixup kvm_arch_vcpu_ioctl_run
    * add trace details to mmio emulation
 - Fix from Marc Zyngier: Move kvm_guest_enter/exit into non-preemptible
   section (squashed into world-switch patch)
 - Cleanup create_hyp_mappings/remove_hyp_mappings from Marc Zyngier
   (squashed into hypervisor initialization patch)
 - Removed the remove_hyp_mappings feature. Removing hypervisor mappings
   could potentially unmap other important data shared in the same page.
 - Removed the arm_ prefix from the arch-specific files.
 - Initial SMP host/guest support

Changes since v3:
 - v4 actually works, fully boots a guest
 - Support compiling as a module
 - Use static inlines instead of macros for vcpu_reg and friends
 - Optimize kvm_vcpu_reg function
 - Use Ftrace for trace capabilities
 - Updated documentation and commenting
 - Use KVM_IRQ_LINE instead of KVM_INTERRUPT
 - Emulates load/store instructions not supported through HSR
  syndrome information.
 - Frees 2nd stage translation tables on VM teardown
 - Handles IRQ/FIQ instructions
 - Handles more CP15 accesses
 - Support guest WFI calls
 - Uses debugfs instead of /proc
 - Support compiling in Thumb mode

Changes since v2:
 - Performs world-switch code
 - Maps guest memory using 2nd stage translation
 - Emulates co-processor 15 instructions
 - Forwards I/O faults to QEMU.

---

Christoffer Dall (12):
      ARM: KVM: Initial skeleton to compile KVM support
      ARM: KVM: Hypervisor identity mapping
      ARM: KVM: Add hypervisor inititalization
      ARM: KVM: Memory virtualization setup
      ARM: KVM: Inject IRQs and FIQs from userspace
      ARM: KVM: World-switch implementation
      ARM: KVM: Emulation framework and CP15 emulation
      ARM: KVM: Handle guest faults in KVM
      ARM: KVM: Handle I/O aborts
      ARM: KVM: Guest wait-for-interrupts (WFI) support
      ARM: KVM: Support SMP hosts
      ARM: KVM: Support SMP guests

Marc Zyngier (1):
      ARM: KVM: Fix guest view of MPIDR


 Documentation/virtual/kvm/api.txt           |   10 
 arch/arm/Kconfig                            |    2 
 arch/arm/Makefile                           |    1 
 arch/arm/include/asm/kvm.h                  |   75 +++
 arch/arm/include/asm/kvm_arm.h              |  130 +++++
 arch/arm/include/asm/kvm_asm.h              |   51 ++
 arch/arm/include/asm/kvm_emulate.h          |  100 ++++
 arch/arm/include/asm/kvm_host.h             |  112 ++++
 arch/arm/include/asm/kvm_mmu.h              |   42 ++
 arch/arm/include/asm/kvm_para.h             |    9 
 arch/arm/include/asm/pgtable-3level-hwdef.h |    5 
 arch/arm/include/asm/pgtable-3level.h       |   12 
 arch/arm/include/asm/pgtable.h              |   11 
 arch/arm/include/asm/unified.h              |   12 
 arch/arm/kernel/armksyms.c                  |    7 
 arch/arm/kernel/asm-offsets.c               |   34 +
 arch/arm/kernel/entry-armv.S                |    1 
 arch/arm/kvm/Kconfig                        |   44 ++
 arch/arm/kvm/Makefile                       |   17 +
 arch/arm/kvm/arm.c                          |  716 +++++++++++++++++++++++++++
 arch/arm/kvm/debug.h                        |   48 ++
 arch/arm/kvm/emulate.c                      |  610 +++++++++++++++++++++++
 arch/arm/kvm/exports.c                      |   26 +
 arch/arm/kvm/guest.c                        |  150 ++++++
 arch/arm/kvm/init.S                         |  115 ++++
 arch/arm/kvm/interrupts.S                   |  496 +++++++++++++++++++
 arch/arm/kvm/mmu.c                          |  512 +++++++++++++++++++
 arch/arm/kvm/trace.h                        |  138 +++++
 arch/arm/mach-vexpress/Kconfig              |    1 
 arch/arm/mm/Kconfig                         |    8 
 arch/arm/mm/idmap.c                         |   54 ++
 arch/arm/mm/mmu.c                           |    3 
 include/linux/kvm.h                         |    1 
 mm/memory.c                                 |    1 
 34 files changed, 3552 insertions(+), 2 deletions(-)
 create mode 100644 arch/arm/include/asm/kvm.h
 create mode 100644 arch/arm/include/asm/kvm_arm.h
 create mode 100644 arch/arm/include/asm/kvm_asm.h
 create mode 100644 arch/arm/include/asm/kvm_emulate.h
 create mode 100644 arch/arm/include/asm/kvm_host.h
 create mode 100644 arch/arm/include/asm/kvm_mmu.h
 create mode 100644 arch/arm/include/asm/kvm_para.h
 create mode 100644 arch/arm/kvm/Kconfig
 create mode 100644 arch/arm/kvm/Makefile
 create mode 100644 arch/arm/kvm/arm.c
 create mode 100644 arch/arm/kvm/debug.h
 create mode 100644 arch/arm/kvm/emulate.c
 create mode 100644 arch/arm/kvm/exports.c
 create mode 100644 arch/arm/kvm/guest.c
 create mode 100644 arch/arm/kvm/init.S
 create mode 100644 arch/arm/kvm/interrupts.S
 create mode 100644 arch/arm/kvm/mmu.c
 create mode 100644 arch/arm/kvm/trace.h

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