On 10/22/22 17:48, Emanuele Giuseppe Esposito wrote:
+static DECLARE_RWSEM(memory_transaction);
This cannot be global, it must be per-struct kvm. Otherwise one VM can keep the rwsem indefinitely while a second VM hangs in KVM_KICK_ALL_RUNNING_VCPUS.
It can also be changed to an SRCU (with the down_write+up_write sequence changed to synchronize_srcu_expedited) which has similar characteristics to your use of the rwsem.
Paolo
