[PATCH v2 0/9] 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.  It also fixes a couple easier to produce races, ones
that have been produced with the PSCI kvm-unit-test test.  The easy two
are addressed in two different ways: the first takes advantage of
power_off having been changed to a vcpu request, the second caches vcpu
MPIDRs in order to avoid extracting them from sys_regs.  I've tested the
series on a Mustang and a ThunderX and compile-tested the ARM bits.

Patch 2/9 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.  Hopefully the document is useful
to others.  I'm not married to it though, so it can be deferred/dropped
as people like...

v2:
  - No longer based on Radim's vcpu request API rework[1], except for
    including "add kvm_request_pending" as patch 1/9 [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.mail-archive.com/linux-kernel@vger.kernel.org/msg1340496.html

Andrew Jones (7):
  KVM: Add documentation for VCPU requests
  KVM: arm/arm64: prepare to use vcpu requests
  KVM: arm/arm64: replace vcpu->arch.pause with a vcpu request
  KVM: arm/arm64: replace vcpu->arch.power_off with a vcpu request
  KVM: arm/arm64: use a vcpu request on irq injection
  KVM: arm/arm64: PMU: remove request-less vcpu kick
  KVM: arm/arm64: avoid race by caching MPIDR

Levente Kurusa (1):
  KVM: arm/arm64: fix race in kvm_psci_vcpu_on

Radim Krčmář (1):
  KVM: add kvm_request_pending

 Documentation/virtual/kvm/vcpu-requests.rst | 114 ++++++++++++++++++++++++++++
 arch/arm/include/asm/kvm_emulate.h          |   2 +-
 arch/arm/include/asm/kvm_host.h             |  13 ++--
 arch/arm/kvm/arm.c                          |  68 +++++++++++------
 arch/arm/kvm/coproc.c                       |  20 +++--
 arch/arm/kvm/handle_exit.c                  |   1 +
 arch/arm/kvm/psci.c                         |  18 ++---
 arch/arm64/include/asm/kvm_emulate.h        |   2 +-
 arch/arm64/include/asm/kvm_host.h           |  13 ++--
 arch/arm64/kvm/handle_exit.c                |   1 +
 arch/arm64/kvm/sys_regs.c                   |  27 +++----
 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                          |  29 +++----
 virt/kvm/arm/vgic/vgic.c                    |  12 ++-
 20 files changed, 245 insertions(+), 96 deletions(-)
 create mode 100644 Documentation/virtual/kvm/vcpu-requests.rst

-- 
2.9.3