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s390/mm: Add gmap pmd invalidation and clearing

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If the host invalidates a pmd, we also have to invalidate the
corresponding gmap pmds, as well as flush them from the TLB. This is
necessary, as we don't share the pmd tables between host and guest as
we do with ptes.

The clearing part of these three new functions sets a guest pmd entry
to _SEGMENT_ENTRY_EMPTY, so the guest will fault on it and we will
re-link it.

Flushing the gmap is not necessary in the host's lazy local and csp
cases. Both purge the TLB completely.

Signed-off-by: Janosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
This commit is contained in:
Janosch Frank
2018-07-13 11:28:22 +01:00
parent 7c4b13a7c0
commit 6a3762778d
3 changed files with 143 additions and 3 deletions
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4
arch/s390/include/asm/pgtable.h
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@@ -1118,6 +1118,10 @@ int set_pgste_bits(struct mm_struct *mm, unsigned long addr,
int get_pgste(struct mm_struct *mm, unsigned long hva, unsigned long *pgstep);
int pgste_perform_essa(struct mm_struct *mm, unsigned long hva, int orc,
unsigned long *oldpte, unsigned long *oldpgste);
void gmap_pmdp_csp(struct mm_struct *mm, unsigned long vmaddr);
void gmap_pmdp_invalidate(struct mm_struct *mm, unsigned long vmaddr);
void gmap_pmdp_idte_local(struct mm_struct *mm, unsigned long vmaddr);
void gmap_pmdp_idte_global(struct mm_struct *mm, unsigned long vmaddr);
/*
* Certain architectures need to do special things when PTEs