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Diffstat (limited to 'Documentation/virt/kvm/locking.rst')
| -rw-r--r-- | Documentation/virt/kvm/locking.rst | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/virt/kvm/locking.rst b/Documentation/virt/kvm/locking.rst index b21a34c34a21..0aa4817b466d 100644 --- a/Documentation/virt/kvm/locking.rst +++ b/Documentation/virt/kvm/locking.rst @@ -16,7 +16,14 @@ The acquisition orders for mutexes are as follows: - kvm->slots_lock is taken outside kvm->irq_lock, though acquiring them together is quite rare. -On x86, vcpu->mutex is taken outside kvm->arch.hyperv.hv_lock. +On x86: + +- vcpu->mutex is taken outside kvm->arch.hyperv.hv_lock + +- kvm->arch.mmu_lock is an rwlock. kvm->arch.tdp_mmu_pages_lock is + taken inside kvm->arch.mmu_lock, and cannot be taken without already + holding kvm->arch.mmu_lock (typically with ``read_lock``, otherwise + there's no need to take kvm->arch.tdp_mmu_pages_lock at all). Everything else is a leaf: no other lock is taken inside the critical sections. |