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KVM: s390: Clear storage keys

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page_table_reset_pgste() already does a complete page table walk to
reset the pgste. Enhance it to initialize the storage keys to
PAGE_DEFAULT_KEY if requested by the caller. This will be used
for lazy storage key handling. Also provide an empty stub for
!CONFIG_PGSTE

Lets adopt the current code (diag 308) to not clear the keys.

Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Dominik Dingel
2014-01-29 16:02:32 +01:00
committed by Christian Borntraeger
parent 65eef33550
commit d4cb11340b
3 changed files with 37 additions and 15 deletions
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6
arch/s390/kvm/diag.c
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@@ -169,15 +169,15 @@ static int __diag_ipl_functions(struct kvm_vcpu *vcpu)
switch (subcode) {
case 0:
case 1:
page_table_reset_pgste(current->mm, 0, TASK_SIZE);
page_table_reset_pgste(current->mm, 0, TASK_SIZE, false);
return -EOPNOTSUPP;
case 3:
vcpu->run->s390_reset_flags = KVM_S390_RESET_CLEAR;
page_table_reset_pgste(current->mm, 0, TASK_SIZE);
page_table_reset_pgste(current->mm, 0, TASK_SIZE, false);
break;
case 4:
vcpu->run->s390_reset_flags = 0;
page_table_reset_pgste(current->mm, 0, TASK_SIZE);
page_table_reset_pgste(current->mm, 0, TASK_SIZE, false);
break;
default:
return -EOPNOTSUPP;