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s390/kvm: fix psw rewinding in handle_skey 

The PSW can wrap if the guest has been running in the 24 bit or 31 bit
addressing mode. Use __rewind_psw to find the correct address.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
This commit is contained in:
Martin Schwidefsky 2013-05-17 14:41:32 +02:00 committed by Gleb Natapov
parent eed3b1e55b
commit dfcf7dc642
1 changed files with 2 additions and 1 deletions
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3
arch/s390/kvm/priv.c
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@ -105,7 +105,8 @@ static int handle_store_cpu_address(struct kvm_vcpu *vcpu)
static int handle_skey(struct kvm_vcpu *vcpu)
{
vcpu->stat.instruction_storage_key++;
vcpu->arch.sie_block->gpsw.addr -= 4;
vcpu->arch.sie_block->gpsw.addr =
__rewind_psw(vcpu->arch.sie_block->gpsw, 4);
VCPU_EVENT(vcpu, 4, "%s", "retrying storage key operation");
return 0;
}