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

[Jason Gunthorpe <jgg@nvidia.com>]

On Wed, Aug 06, 2025 at 09:34:12AM -0700, Dave Hansen wrote:
> struct kernel_pgtable_work
> {
> 	struct list_head list;
> 	spinlock_t lock;
> 	struct work_struct work;
> } kernel_pte_work;
> 
> pte_free_kernel()
> {
> 	struct page *page = ptdesc_magic();
> 
> 	guard(spinlock)(&kernel_pte_work.lock);
> 	
> 	list_add(&page->list, &kernel_pte_work.list);
> 	schedule_work(&kernel_pte_work.work);
> }

Oh, OK, yeah this can work

> The only wrinkle is that pte_free_kernel() itself still has a pte and
> 'ptdesc', not a 'struct page'. But there is ptdesc->pt_list, which
> should be unused at this point, especially for non-pgd pages on x86.

It should all be ptdesc, so lets avoid a struct page here and use the
pt_list instead..

Jason