[PATCH v2 03/19] mm: Mark special bits for huge pfn mappings when inject

[David Hildenbrand]

On 26.08.24 22:43, Peter Xu wrote:
> We need these special bits to be around on pfnmaps.  Mark properly for
> !devmap case, reflecting that there's no page struct backing the entry.
> 
> Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>
> Signed-off-by: Peter Xu <peterx at redhat.com>
> ---
>   mm/huge_memory.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 3f74b09ada38..dec17d09390f 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -1346,6 +1346,8 @@ static void insert_pfn_pmd(struct vm_area_struct *vma, unsigned long addr,
>   	entry = pmd_mkhuge(pfn_t_pmd(pfn, prot));
>   	if (pfn_t_devmap(pfn))
>   		entry = pmd_mkdevmap(entry);
> +	else
> +		entry = pmd_mkspecial(entry);
>   	if (write) {
>   		entry = pmd_mkyoung(pmd_mkdirty(entry));
>   		entry = maybe_pmd_mkwrite(entry, vma);
> @@ -1442,6 +1444,8 @@ static void insert_pfn_pud(struct vm_area_struct *vma, unsigned long addr,
>   	entry = pud_mkhuge(pfn_t_pud(pfn, prot));
>   	if (pfn_t_devmap(pfn))
>   		entry = pud_mkdevmap(entry);
> +	else
> +		entry = pud_mkspecial(entry);
>   	if (write) {
>   		entry = pud_mkyoung(pud_mkdirty(entry));
>   		entry = maybe_pud_mkwrite(entry, vma);

Acked-by: David Hildenbrand <david at redhat.com>

-- 
Cheers,

David / dhildenb