This series fixes some hard to produce races by introducing the use of
vcpu requests. I've tested the series on a Mustang and ThunderX and
compile-tested the ARM bits.
Patch 3/11 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.
v5:
- Christoffer's doc clarification suggestions
- Use kvm_vcpu_wake_up() [Christoffer]
v4:
- Rebase on latest kvmarm/queue. No more kvm_arm_halt/resume_vcpu
- Documentation additions/clarifications [Paolo]
- go back to sleep after getting a signal [Christoffer]
- timer doesn't need a vcpu request, just a wake up [Christoffer]
- patch dropping/adding/reshuffling for above changes
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 (10):
KVM: improve arch vcpu request defining
KVM: Add documentation for VCPU requests
KVM: arm/arm64: properly use vcpu requests
KVM: arm/arm64: replace pause checks with vcpu request checks
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
KVM: arm/arm64: timer: remove request-less vcpu kick
Radim Krčmář (1):
KVM: add kvm_request_pending
Documentation/virtual/kvm/vcpu-requests.rst | 307 ++++++++++++++++++++++++++++
arch/arm/include/asm/kvm_host.h | 4 +-
arch/arm/kvm/handle_exit.c | 1 +
arch/arm64/include/asm/kvm_host.h | 4 +-
arch/arm64/kvm/handle_exit.c | 1 +
arch/mips/kvm/trap_emul.c | 2 +-
arch/mips/kvm/vz.c | 2 +-
arch/powerpc/include/asm/kvm_host.h | 4 +-
arch/powerpc/kvm/booke.c | 2 +-
arch/powerpc/kvm/powerpc.c | 5 +-
arch/s390/include/asm/kvm_host.h | 6 +-
arch/s390/kvm/kvm-s390.c | 2 +-
arch/x86/include/asm/kvm_host.h | 47 +++--
arch/x86/kvm/x86.c | 4 +-
include/linux/kvm_host.h | 12 ++
virt/kvm/arm/arch_timer.c | 2 +-
virt/kvm/arm/arm.c | 50 ++++-
virt/kvm/arm/pmu.c | 40 ++--
virt/kvm/arm/psci.c | 8 +-
virt/kvm/arm/vgic/vgic.c | 9 +-
20 files changed, 439 insertions(+), 73 deletions(-)
create mode 100644 Documentation/virtual/kvm/vcpu-requests.rst
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2.9.4
