On Wed, Jun 30, 2021, David Matlack wrote:
> diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
> index caac4ddb46df..c6fa8d00bf9f 100644
> --- a/arch/x86/kvm/mmu/tdp_mmu.c
> +++ b/arch/x86/kvm/mmu/tdp_mmu.c
> @@ -1513,12 +1513,24 @@ bool kvm_tdp_mmu_write_protect_gfn(struct kvm *kvm,
> return spte_set;
> }
>
> +void kvm_tdp_mmu_walk_lockless_begin(void)
> +{
> + rcu_read_lock();
> +}
> +
> +void kvm_tdp_mmu_walk_lockless_end(void)
> +{
> + rcu_read_unlock();
> +}
I vote to make these static inlines. They're nops in a non-debug build, and it's
not like it's a secret that the TDP MMU relies on RCU to protect its page tables.
