mm: mark special bits for huge pfn mappings when inject

jira LE-3557
Rebuild_History Non-Buildable kernel-5.14.0-570.26.1.el9_6
commit-author Peter Xu <[email protected]>
commit 3c8e44c

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.

Link: https://lkml.kernel.org/r/[email protected]
	Reviewed-by: Jason Gunthorpe <[email protected]>
	Signed-off-by: Peter Xu <[email protected]>
	Acked-by: David Hildenbrand <[email protected]>
	Cc: Alexander Gordeev <[email protected]>
	Cc: Alex Williamson <[email protected]>
	Cc: Aneesh Kumar K.V <[email protected]>
	Cc: Borislav Petkov <[email protected]>
	Cc: Catalin Marinas <[email protected]>
	Cc: Christian Borntraeger <[email protected]>
	Cc: Dave Hansen <[email protected]>
	Cc: Gavin Shan <[email protected]>
	Cc: Gerald Schaefer <[email protected]>
	Cc: Heiko Carstens <[email protected]>
	Cc: Ingo Molnar <[email protected]>
	Cc: Matthew Wilcox <[email protected]>
	Cc: Niklas Schnelle <[email protected]>
	Cc: Paolo Bonzini <[email protected]>
	Cc: Ryan Roberts <[email protected]>
	Cc: Sean Christopherson <[email protected]>
	Cc: Sven Schnelle <[email protected]>
	Cc: Thomas Gleixner <[email protected]>
	Cc: Vasily Gorbik <[email protected]>
	Cc: Will Deacon <[email protected]>
	Cc: Zi Yan <[email protected]>
	Signed-off-by: Andrew Morton <[email protected]>
(cherry picked from commit 3c8e44c)
	Signed-off-by: Jonathan Maple <[email protected]>

Author: PlaidCat

mm/huge_memory.c

@@ -860,6 +860,8 @@ 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);
@@ -958,6 +960,8 @@ 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);