Re: [PATCH 10/12] KVM: MMU: allow locklessly access shadow pagetable out of vcpu thread

[Takuya Yoshikawa]

On Tue, 30 Jul 2013 21:02:08 +0800
Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx> wrote:

> @@ -2342,6 +2358,13 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
>  	 */
>  	kvm_flush_remote_tlbs(kvm);
>  
> +	if (kvm->arch.rcu_free_shadow_page) {
> +		sp = list_first_entry(invalid_list, struct kvm_mmu_page, link);
> +		list_del_init(invalid_list);
> +		call_rcu(&sp->rcu, free_pages_rcu);
> +		return;
> +	}
> +
>  	list_for_each_entry_safe(sp, nsp, invalid_list, link) {
>  		WARN_ON(!sp->role.invalid || sp->root_count);
>  		kvm_mmu_free_page(sp);

Shouldn't we avoid calling call_rcu() when we are holding mmu_lock?

	Takuya
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