[xen stable-4.19] x86/mm: update log-dirty bitmap when manipulating P2M

[patchbot@xxxxxxx]

commit c2affd2788324c46a256826e171ef9105a9e37be
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Jan 13 15:49:30 2026 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jan 13 15:49:30 2026 +0100

    x86/mm: update log-dirty bitmap when manipulating P2M
    
    Just like for PV guests MMU_MACHPHYS_UPDATE implies marking of the
    respective page as dirty, additions to a HVM guest's P2M should do so.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    [jb: backport limited to the new paging_mark_pfn_dirty() use]
    master commit: 98fccdf0ac7c1a909b54dd5beeba54a0a23f756c
    master date: 2025-12-11 09:50:30 +0100
---
 xen/arch/x86/mm/p2m.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index 41fc108bba..8c31bf808d 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -738,8 +738,11 @@ p2m_add_page(struct domain *d, gfn_t gfn, mfn_t mfn,
         if ( !p2m_is_grant(t) )
         {
             for ( i = 0; i < (1UL << page_order); i++ )
+            {
                 set_gpfn_from_mfn(mfn_x(mfn_add(mfn, i)),
                                   gfn_x(gfn_add(gfn, i)));
+                paging_mark_pfn_dirty(d, _pfn(gfn_x(gfn) + i));
+            }
         }
     }
     else
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.19