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

Andrew Jones
2017-05-03T16:06:25Z

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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