[PATCH v2 0/4] KVM: extract lock_all_vcpus/unlock_all_vcpus

[Maxim Levitsky]

Implement Paolo's suggestion of reusing
sev_lock/unlock_vcpus_for_migration in arm and riscv code
for the purpose of taking vcpu->mutex of all vcpus of a VM.

Because sev_lock/unlock_vcpus_for_migration already have a workaround
for lockdep max lock depth, this fixes the lockdep warnings on arm
which were the inspiration for this refactoring.

This patch series was only compile tested on all 3 architectures.

V2: added trylock option to kvm_lock_all_vcpus to be better compatible
with the orginal code.

Best regards,
	Maxim Levitsky

Maxim Levitsky (4):
  locking/mutex: implement mutex_trylock_nested
  KVM: x86: move sev_lock/unlock_vcpus_for_migration to kvm_main.c
  KVM: arm64: switch to using kvm_lock/unlock_all_vcpus
  RISC-V: KVM: switch to kvm_lock/unlock_all_vcpus

 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                | 65 ++----------------------
 include/linux/kvm_host.h              |  6 +++
 include/linux/mutex.h                 |  8 +++
 kernel/locking/mutex.c                | 14 ++++--
 virt/kvm/kvm_main.c                   | 71 +++++++++++++++++++++++++++
 12 files changed, 116 insertions(+), 156 deletions(-)

-- 
2.26.3