[PATCH v3 0/4] KVM: lockdep improvements

[Maxim Levitsky]

This is	a continuation of my 'extract lock_all_vcpus/unlock_all_vcpus'
patch series.

Implement the suggestion of using lockdep's "nest_lock" feature
when locking all KVM vCPUs by adding mutex_trylock_nest_lock() and
mutex_lock_killable_nest_lock() and use these functions	in the
implementation of the
kvm_trylock_all_vcpus()/kvm_lock_all_vcpus()/kvm_unlock_all_vcpus().

Those changes allow removal of a custom workaround that was needed to
silence the lockdep warning in the SEV code and also stop lockdep from
complaining in case of ARM and RISC-V code which doesn't include the above
mentioned workaround.

Finally, it's worth noting that this patch series removes a fair
amount of duplicate code by implementing the logic in one place.

Best regards,
	Maxim Levitsky

Maxim Levitsky (4):
  arm64: KVM: use mutex_trylock_nest_lock when locking all vCPUs
  RISC-V: KVM: switch to kvm_lock/unlock_all_vcpus
  locking/mutex: implement mutex_lock_killable_nest_lock
  x86: KVM: SEV: implement kvm_lock_all_vcpus and use it

 arch/arm64/include/asm/kvm_host.h     |  3 --
 arch/arm64/kvm/arch_timer.c           |  4 +-
 arch/arm64/kvm/arm.c                  | 43 ----------------
 arch/arm64/kvm/vgic/vgic-init.c       |  4 +-
 arch/arm64/kvm/vgic/vgic-its.c        |  8 +--
 arch/arm64/kvm/vgic/vgic-kvm-device.c | 12 ++---
 arch/riscv/kvm/aia_device.c           | 34 +------------
 arch/x86/kvm/svm/sev.c                | 72 ++-------------------------
 include/linux/kvm_host.h              |  4 ++
 include/linux/mutex.h                 | 17 +++++--
 kernel/locking/mutex.c                |  7 +--
 virt/kvm/kvm_main.c                   | 59 ++++++++++++++++++++++
 12 files changed, 100 insertions(+), 167 deletions(-)

-- 
2.46.0