Re: [KVM] d3750a0923: WARNING:possible_circular_locking_dependency_detected

[Paolo Bonzini]

On 12/5/21 14:30, kernel test robot wrote:
> Chain exists of:
>   fs_reclaim --> mmu_notifier_invalidate_range_start --> &(kvm)->mmu_lock
>
>  Possible unsafe locking scenario:
>
>        CPU0                    CPU1
>        ----                    ----
>   lock(&(kvm)->mmu_lock);
>                                lock(mmu_notifier_invalidate_range_start);
>                                lock(&(kvm)->mmu_lock);
>   lock(fs_reclaim);

David, this is yours; basically, kvm_mmu_topup_memory_cache must be 
called outside the mmu_lock.

Paolo