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
