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KVM: s390: pfmf: support conditional-sske facility

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We already indicate that facility but don't implement it in our pfmf
interception handler. Let's add a new storage key handling function for
conditionally setting the guest storage key.

As we will reuse this function later on, let's directly implement returning
the old key via parameter and indicating if any change happened via rc.

Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand
2016-05-10 09:43:11 +02:00
committed by Christian Borntraeger
parent 2c26d1d23a
commit 1824c723ac
3 changed files with 50 additions and 4 deletions
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3
arch/s390/include/asm/pgtable.h
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@@ -893,6 +893,9 @@ 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 address);
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,
unsigned char key, unsigned char *oldkey,
bool nq, bool mr, bool mc);
int get_guest_storage_key(struct mm_struct *mm, unsigned long addr,
unsigned char *key);