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KVM: s390: Improve is_valid_psw()
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As a program status word is also invalid (and thus generates an
specification exception) if the instruction address is not even,
we should test this in is_valid_psw(), too. This patch also exports
the function so that it becomes available for other parts of the
S390 KVM code as well.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
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Thomas Huth authored and Christian Borntraeger committed May 16, 2014
1 parent 3a80151 commit a3fb577
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Showing 2 changed files with 5 additions and 1 deletion.
1 change: 1 addition & 0 deletions arch/s390/kvm/kvm-s390.h
Original file line number Diff line number Diff line change
Expand Up @@ -142,6 +142,7 @@ void kvm_s390_reinject_io_int(struct kvm *kvm,
int kvm_s390_mask_adapter(struct kvm *kvm, unsigned int id, bool masked);

/* implemented in priv.c */
int is_valid_psw(psw_t *psw);
int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
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5 changes: 4 additions & 1 deletion arch/s390/kvm/priv.c
Original file line number Diff line number Diff line change
Expand Up @@ -365,7 +365,8 @@ static void handle_new_psw(struct kvm_vcpu *vcpu)
#define PSW_ADDR_24 0x0000000000ffffffUL
#define PSW_ADDR_31 0x000000007fffffffUL

static int is_valid_psw(psw_t *psw) {
int is_valid_psw(psw_t *psw)
{
if (psw->mask & PSW_MASK_UNASSIGNED)
return 0;
if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_BA) {
Expand All @@ -376,6 +377,8 @@ static int is_valid_psw(psw_t *psw) {
return 0;
if ((psw->mask & PSW_MASK_ADDR_MODE) == PSW_MASK_EA)
return 0;
if (psw->addr & 1)
return 0;
return 1;
}

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