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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2016-04-13 10:09:47 +0200
committerChristian Borntraeger <borntraeger@de.ibm.com>2016-06-10 12:07:28 +0200
commit6164a2e90a5b6c5c32ccfe7a1baff80d603d702d (patch)
treee228ebab5b999145ff8b018d43a979915c03bcae /arch/s390/kvm/priv.c
parentKVM: s390: storage keys fit into a char (diff)
downloadlinux-6164a2e90a5b6c5c32ccfe7a1baff80d603d702d.tar.xz
linux-6164a2e90a5b6c5c32ccfe7a1baff80d603d702d.zip
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>
Diffstat (limited to 'arch/s390/kvm/priv.c')
-rw-r--r--arch/s390/kvm/priv.c20
1 files changed, 9 insertions, 11 deletions
diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
index c6deed782c61..bfba98302ca0 100644
--- a/arch/s390/kvm/priv.c
+++ b/arch/s390/kvm/priv.c
@@ -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);