KVM: s390: Fix low-address protection for real addresses

The kvm_s390_check_low_addr_protection() function is used only with real
addresses. According to the POP (the "Low-Address Protection"
paragraph in chapter 3), if the effective address is real or absolute,
the low-address protection procedure should raise a PROTECTION exception
only when the low-address protection is enabled in the control register
0 and the address is low.
This patch removes ASCE checks from the function and renames it to
better reflect its behavior.

Cc: Thomas Huth <thuth@linux.vnet.ibm.com>
Signed-off-by: Alexander Yarygin <yarygin@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c
index 633fe9bd75a9..c230904429cc 100644
--- a/arch/s390/kvm/gaccess.c
+++ b/arch/s390/kvm/gaccess.c
@@ -697,28 +697,29 @@ int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva,
 }
 
 /**
- * kvm_s390_check_low_addr_protection - check for low-address protection
- * @ga: Guest address
+ * kvm_s390_check_low_addr_prot_real - check for low-address protection
+ * @gra: Guest real address
  *
  * Checks whether an address is subject to low-address protection and set
  * up vcpu->arch.pgm accordingly if necessary.
  *
  * Return: 0 if no protection exception, or PGM_PROTECTION if protected.
  */
-int kvm_s390_check_low_addr_protection(struct kvm_vcpu *vcpu, unsigned long ga)
+int kvm_s390_check_low_addr_prot_real(struct kvm_vcpu *vcpu, unsigned long gra)
 {
 	struct kvm_s390_pgm_info *pgm = &vcpu->arch.pgm;
 	psw_t *psw = &vcpu->arch.sie_block->gpsw;
 	struct trans_exc_code_bits *tec_bits;
+	union ctlreg0 ctlreg0 = {.val = vcpu->arch.sie_block->gcr[0]};
 
-	if (!is_low_address(ga) || !low_address_protection_enabled(vcpu))
+	if (!ctlreg0.lap || !is_low_address(gra))
 		return 0;
 
 	memset(pgm, 0, sizeof(*pgm));
 	tec_bits = (struct trans_exc_code_bits *)&pgm->trans_exc_code;
 	tec_bits->fsi = FSI_STORE;
 	tec_bits->as = psw_bits(*psw).as;
-	tec_bits->addr = ga >> PAGE_SHIFT;
+	tec_bits->addr = gra >> PAGE_SHIFT;
 	pgm->code = PGM_PROTECTION;
 
 	return pgm->code;