[PATCH v3 00/10] KVM: arm/arm64: race fixes and vcpu requests

[Andrew Jones <drjones@redhat.com>]

This series fixes some hard to produce races by introducing the use of
vcpu requests. I've tested the series on a Mustang and a ThunderX and
compile-tested the ARM bits.

Patch 2/10 adds documentation, as, at least for me, understanding vcpu
request interplay with vcpu kicks and vcpu mode and the memory barriers
that interplay implies, is exhausting.

v3:
  - The easier to reproduce PSCI races previously fixed with this
    series were fixed independently with a different approach suggested
    by Christoffer[1].
  - Based on Radim's latest vcpu request rework series[2]
  - Rewrote the documentation adding much more information and
    incorporating Christoffer's comments from v2.
  - Reworked the approach to controlling pause and power_off by
    requests.
  - Clear request for pending irq injection in the correct place, as
    pointed out by Christoffer.
  - Rebase required some simple changes to the PMU code patch.

v2:
  - No longer based on Radim's vcpu request API rework[3], except for
    including "add kvm_request_pending" as patch 1/10 [drew]
  - Added vcpu request documentation [drew]
  - Dropped the introduction of user settable MPIDRs [Christoffer]
  - Added vcpu requests to all request-less vcpu kicks [Christoffer]

[1] https://www.spinics.net/lists/arm-kernel/msg577630.html
[2] http://www.spinics.net/lists/kvm/msg148890.html
[3] https://www.spinics.net/lists/kvm/msg145588.html


Andrew Jones (9):
  KVM: Add documentation for VCPU requests
  KVM: arm/arm64: prepare to use vcpu requests
  KVM: arm/arm64: use vcpu request in kvm_arm_halt_vcpu
  KVM: arm/arm64: don't clear exit request from caller
  KVM: arm/arm64: use vcpu requests for power_off
  KVM: arm/arm64: optimize VCPU RUN
  KVM: arm/arm64: change exit request to sleep request
  KVM: arm/arm64: use vcpu requests for irq injection
  KVM: arm/arm64: PMU: remove request-less vcpu kick

Radim Krčmář (1):
  KVM: add kvm_request_pending

 Documentation/virtual/kvm/vcpu-requests.rst | 269 ++++++++++++++++++++++++++++
 arch/arm/include/asm/kvm_host.h             |   3 +-
 arch/arm/kvm/arm.c                          |  46 ++++-
 arch/arm/kvm/handle_exit.c                  |   1 +
 arch/arm/kvm/psci.c                         |   8 +-
 arch/arm64/include/asm/kvm_host.h           |   3 +-
 arch/arm64/kvm/handle_exit.c                |   1 +
 arch/mips/kvm/trap_emul.c                   |   2 +-
 arch/powerpc/kvm/booke.c                    |   2 +-
 arch/powerpc/kvm/powerpc.c                  |   5 +-
 arch/s390/kvm/kvm-s390.c                    |   2 +-
 arch/x86/kvm/x86.c                          |   4 +-
 include/linux/kvm_host.h                    |   5 +
 virt/kvm/arm/arch_timer.c                   |   1 +
 virt/kvm/arm/pmu.c                          |  40 ++---
 virt/kvm/arm/vgic/vgic.c                    |   9 +-
 16 files changed, 357 insertions(+), 44 deletions(-)
 create mode 100644 Documentation/virtual/kvm/vcpu-requests.rst

-- 
2.9.3

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