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KVM: s390: pfmf: fix end address calculation 

The current calculation is wrong if absolute != real address. Let's just
calculate the start address for 4k frames upfront. Otherwise, the
calculated end address will be wrong, resulting in wrong memory
location/storage keys getting touched.

To keep low-address protection working (using the effective address),
we have to move the check.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
David Hildenbrand 2016-04-13 10:09:47 +02:00 committed by Christian Borntraeger
parent fe69eabf8d
commit 6164a2e90a
1 changed files with 9 additions and 11 deletions
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20
arch/s390/kvm/priv.c
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@ -682,8 +682,15 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
start = vcpu->run->s.regs.gprs[reg2] & PAGE_MASK;
start = kvm_s390_logical_to_effective(vcpu, start);
if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
if (kvm_s390_check_low_addr_prot_real(vcpu, start))
return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
}
switch (vcpu->run->s.regs.gprs[reg1] & PFMF_FSC) {
case 0x00000000:
/* only 4k frames specify a real address */
start = kvm_s390_real_to_abs(vcpu, start);
end = (start + (1UL << 12)) & ~((1UL << 12) - 1);
break;
case 0x00001000:
@ -701,20 +708,11 @@ static int handle_pfmf(struct kvm_vcpu *vcpu)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
}
if (vcpu->run->s.regs.gprs[reg1] & PFMF_CF) {
if (kvm_s390_check_low_addr_prot_real(vcpu, start))
return kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
}
while (start < end) {
unsigned long useraddr, abs_addr;
unsigned long useraddr;
/* 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));
useraddr = gfn_to_hva(vcpu->kvm, gpa_to_gfn(start));
if (kvm_is_error_hva(useraddr))
return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);