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| author |   David Hildenbrand <dahi@linux.vnet.ibm.com> | 2016-04-13 10:09:47 +0200 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@de.ibm.com> | 2016-06-10 12:07:28 +0200 |
| commit | 6164a2e90a5b6c5c32ccfe7a1baff80d603d702d (patch) | |
| tree | e228ebab5b999145ff8b018d43a979915c03bcae /arch/s390/kvm/priv.c | |
| parent | KVM: s390: storage keys fit into a char (diff) | |
| download | linux-dev-6164a2e90a5b6c5c32ccfe7a1baff80d603d702d.tar.xz linux-dev-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.c | 20 |
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); |