Re: [PATCH v3 1/1] iommu/sva: Invalidate KVA range on kernel TLB flush

[Jason Gunthorpe <jgg@nvidia.com>]

On Fri, Aug 08, 2025 at 01:15:12PM +0800, Baolu Lu wrote:
> +static void kernel_pte_work_func(struct work_struct *work)
> +{
> +	struct ptdesc *ptdesc, *next;
> +
> +	iommu_sva_invalidate_kva_range(0, TLB_FLUSH_ALL);
> +
> +	guard(spinlock)(&kernel_pte_work.lock);
> +	list_for_each_entry_safe(ptdesc, next, &kernel_pte_work.list, pt_list) {
> +		list_del_init(&ptdesc->pt_list);
> +		pagetable_dtor_free(ptdesc);
> +	}

Do a list_move from kernel_pte_work.list to an on-stack list head and
then immediately release the lock. No reason to hold the spinock while
doing frees, also no reason to do list_del_init, that memory probably
gets zerod in pagetable_dtor_free()

Jason