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@xxxxxxxxxxxxxxx/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
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