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KVM: s390: Fix guest migration for huge guests resulting in panic

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am: 9d89c20f3b

Change-Id: I3a3b215e0e9254f87ccb05ee17a2bc7881fdd272
This commit is contained in:
Janosch Frank
2017-03-18 11:36:38 +00:00
committed by android-build-merger
parent 06e68c07cd 9d89c20f3b
commit 8b551ea6ba
1 changed files with 18 additions and 1 deletions
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19
arch/s390/mm/pgtable.c
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@@ -606,12 +606,29 @@ void ptep_zap_key(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
bool test_and_clear_guest_dirty(struct mm_struct *mm, unsigned long addr)
{
spinlock_t *ptl;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pgste_t pgste;
pte_t *ptep;
pte_t pte;
bool dirty;
ptep = get_locked_pte(mm, addr, &ptl);
pgd = pgd_offset(mm, addr);
pud = pud_alloc(mm, pgd, addr);
if (!pud)
return false;
pmd = pmd_alloc(mm, pud, addr);
if (!pmd)
return false;
/* We can't run guests backed by huge pages, but userspace can
* still set them up and then try to migrate them without any
* migration support.
*/
if (pmd_large(*pmd))
return true;
ptep = pte_alloc_map_lock(mm, pmd, addr, &ptl);
if (unlikely(!ptep))
return false;