KVM: s390: Fixes for PFMF

Add a check for low-address protection to the PFMF handler and
convert real-addresses to absolute if necessary, as it is defined
in the Principles of Operations specification.

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>

1 files changed, 14 insertions, 4 deletions

diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index 27f9051a78f8..a47157bca8a6 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -650,6 +650,11 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
 
         start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
+        if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
+                if (kvm_s390_check_low_addr_protection(vcpu, start))
+                        return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
+        }
+
         switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
         case 0x00000000:
                 end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
@@ -665,10 +670,15 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
                 return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
         }
         while (start < end) {
-                unsigned long useraddr;
-
-                useraddr = gmap_translate(start, vcpu->arch.gmap);
-                if (IS_ERR((void *)useraddr))
+                unsigned long useraddr, abs_addr;
+
+                /* Translate guest address to host address */
+                if ((vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) == 0)
+                        abs_addr = kvm_s390_real_to_abs(vcpu, start);
+                else
+                        abs_addr = start;
+                useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(abs_addr));
+                if (kvm_is_error_hva(useraddr))
                         return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
 
                 if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {