Re: [PATCH 08/24] kvm: x86/mmu: Add lockdep when setting a TDP MMU SPTE

Paolo Bonzini
2021-01-26T14:16:18Z

On 12/01/21 19:10, Ben Gardon wrote:
> Add lockdep to __tdp_mmu_set_spte to ensure that SPTEs are only modified
> under the MMU lock. This lockdep will be updated in future commits to
> reflect and validate changes to the TDP MMU's synchronization strategy.
>
> No functional change intended.
>
> Reviewed-by: Peter Feiner <pfeiner@google.com>
>
> Signed-off-by: Ben Gardon <bgardon@google.com>
> ---
> arch/x86/kvm/mmu/tdp_mmu.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
> index b033da8243fc..411938e97a00 100644
> --- a/arch/x86/kvm/mmu/tdp_mmu.c
> +++ b/arch/x86/kvm/mmu/tdp_mmu.c
> @@ -381,6 +381,8 @@ static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,
> struct kvm_mmu_page *root = sptep_to_sp(root_pt);
> int as_id = kvm_mmu_page_as_id(root);
>
> + lockdep_assert_held(&kvm->mmu_lock);
> +
> WRITE_ONCE(*iter->sptep, new_spte);
>
> __handle_changed_spte(kvm, as_id, iter->gfn, iter->old_spte, new_spte,
>

Queued, thanks.

Paolo