[RFC PATCH 0/6] ARM64: KVM: PMU infrastructure support

[Anup Patel]

This patchset enables PMU virtualization in KVM ARM64. The
Guest can now directly use PMU available on the host HW.

The virtual PMU IRQ injection for Guest VCPUs is managed by
small piece of code shared between KVM ARM and KVM ARM64. The
virtual PMU IRQ number will be based on Guest machine model and
user space will provide it using set device address vm ioctl.

The second last patch of this series implements full context
switch of PMU registers which will context switch all PMU
registers on every KVM world-switch.

The last patch implements a lazy context switch of PMU registers
which is very similar to lazy debug context switch.
(Refer, http://lists.infradead.org/pipermail/linux-arm-kernel/2014-July/271040.html)

Also, we reserve last PMU event counter for EL2 mode which
will not be accessible from Host and Guest EL1 mode. This
reserved EL2 mode PMU event counter can be used for profiling
KVM world-switch and other EL2 mode functions.

All testing have been done using KVMTOOL on X-Gene Mustang and
Foundation v8 Model for both Aarch32 and Aarch64 guest.

Anup Patel (6):
  ARM64: Move PMU register related defines to asm/pmu.h
  ARM64: perf: Re-enable overflow interrupt from interrupt handler
  ARM: perf: Re-enable overflow interrupt from interrupt handler
  ARM/ARM64: KVM: Add common code PMU IRQ routing
  ARM64: KVM: Implement full context switch of PMU registers
  ARM64: KVM: Upgrade to lazy context switch of PMU registers

 arch/arm/include/asm/kvm_host.h   |    9 +
 arch/arm/include/uapi/asm/kvm.h   |    1 +
 arch/arm/kernel/perf_event_v7.c   |    8 +
 arch/arm/kvm/arm.c                |    6 +
 arch/arm/kvm/reset.c              |    4 +
 arch/arm64/include/asm/kvm_asm.h  |   39 +++-
 arch/arm64/include/asm/kvm_host.h |   12 ++
 arch/arm64/include/asm/pmu.h      |   44 +++++
 arch/arm64/include/uapi/asm/kvm.h |    1 +
 arch/arm64/kernel/asm-offsets.c   |    2 +
 arch/arm64/kernel/perf_event.c    |   40 +---
 arch/arm64/kvm/Kconfig            |    7 +
 arch/arm64/kvm/Makefile           |    1 +
 arch/arm64/kvm/hyp-init.S         |   15 ++
 arch/arm64/kvm/hyp.S              |  209 +++++++++++++++++++-
 arch/arm64/kvm/reset.c            |    4 +
 arch/arm64/kvm/sys_regs.c         |  385 +++++++++++++++++++++++++++++++++----
 include/kvm/arm_pmu.h             |   52 +++++
 virt/kvm/arm/pmu.c                |  105 ++++++++++
 19 files changed, 870 insertions(+), 74 deletions(-)
 create mode 100644 include/kvm/arm_pmu.h
 create mode 100644 virt/kvm/arm/pmu.c

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1.7.9.5