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KVM: s390: Fixed priority of execution in STSI

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Added some missing validity checks for the operands and fixed the
priority of exceptions for some function codes according to the
"Principles of Operation" document.

Signed-off-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Thomas Huth 2013-06-20 17:22:05 +02:00 committed by Paolo Bonzini
parent 953ed88d10
commit 87d41fb4da
1 changed files with 16 additions and 7 deletions
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23
arch/s390/kvm/priv.c
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@ -385,16 +385,27 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);
if (fc > 3) {
vcpu->arch.sie_block->gpsw.mask |= 3ul << 44; /* cc 3 */
return 0;
}
if (vcpu->run->s.regs.gprs[0] & 0x0fffff00
|| vcpu->run->s.regs.gprs[1] & 0xffff0000)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
if (fc == 0) {
vcpu->run->s.regs.gprs[0] = 3 << 28;
vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44); /* cc 0 */
return 0;
}
operand2 = kvm_s390_get_base_disp_s(vcpu);
if (operand2 & 0xfff && fc > 0)
if (operand2 & 0xfff)
return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
switch (fc) {
case 0:
vcpu->run->s.regs.gprs[0] = 3 << 28;
vcpu->arch.sie_block->gpsw.mask &= ~(3ul << 44);
return 0;
case 1: /* same handling for 1 and 2 */
case 2:
mem = get_zeroed_page(GFP_KERNEL);
@ -411,8 +422,6 @@ static int handle_stsi(struct kvm_vcpu *vcpu)
goto out_no_data;
handle_stsi_3_2_2(vcpu, (void *) mem);
break;
default:
goto out_no_data;
}
if (copy_to_guest_absolute(vcpu, operand2, (void *) mem, PAGE_SIZE)) {