commit dd9e5b7bdba3250c075a212ff632d31edfa91ae7
author Alexander Yarygin <yarygin@linux.vnet.ibm.com> Tue Mar 03 14:26:14 2015 +0300
committer Christian Borntraeger <borntraeger@de.ibm.com> Tue Mar 17 16:24:38 2015 +0100
tree 06666c57566175f67091bf509c36c678fa8e82a6
parent 40f5b735e867b8fd3e6090f5a184950c68d227bb

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>

arch/s390/kvm/priv.c

diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index b982fbc..5f26425 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -207,7 +207,7 @@
 	kvm_s390_get_regs_rre(vcpu, NULL, &reg2);
 	addr = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
 	addr = kvm_s390_logical_to_effective(vcpu, addr);
-	if (kvm_s390_check_low_addr_protection(vcpu, addr))
+	if (kvm_s390_check_low_addr_prot_real(vcpu, addr))
 		return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 	addr = kvm_s390_real_to_abs(vcpu, addr);
 
@@ -680,7 +680,7 @@
 	}
 
 	if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
-		if (kvm_s390_check_low_addr_protection(vcpu, start))
+		if (kvm_s390_check_low_addr_prot_real(vcpu, start))
 			return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
 	}