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s390/mm: Add huge page dirty sync support

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To do dirty loging with huge pages, we protect huge pmds in the
gmap. When they are written to, we unprotect them and mark them dirty.

We introduce the function gmap_test_and_clear_dirty_pmd which handles
dirty sync for huge pages.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
Janosch Frank
2018-07-17 13:21:22 +01:00
parent 6a3762778d
commit 0959e16867
5 changed files with 148 additions and 44 deletions
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3
arch/s390/include/asm/pgtable.h
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@@ -1103,7 +1103,8 @@ int ptep_shadow_pte(struct mm_struct *mm, unsigned long saddr,
pte_t *sptep, pte_t *tptep, pte_t pte);
void ptep_unshadow_pte(struct mm_struct *mm, unsigned long saddr, pte_t *ptep);
bool test_and_clear_guest_dirty(struct mm_struct *mm, unsigned long address);
bool ptep_test_and_clear_uc(struct mm_struct *mm, unsigned long address,
pte_t *ptep);
int set_guest_storage_key(struct mm_struct *mm, unsigned long addr,
unsigned char key, bool nq);
int cond_set_guest_storage_key(struct mm_struct *mm, unsigned long addr,