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KVM: s390: Return error on SIDA memop on normal guest

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Refuse SIDA memops on guests which are not protected.
For normal guests, the secure instruction data address designation,
which determines the location we access, is not under control of KVM.

Fixes: 19e1227768 (KVM: S390: protvirt: Introduce instruction data area bounce buffer)
Signed-off-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
Cc: stable@vger.kernel.org
Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
This commit is contained in:
Janis Schoetterl-Glausch 2022-01-28 15:06:43 +01:00 committed by Christian Borntraeger
parent 9f7fb8de5d
commit 2c212e1bae
1 changed files with 2 additions and 0 deletions
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2
arch/s390/kvm/kvm-s390.c
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@ -4667,6 +4667,8 @@ static long kvm_s390_guest_sida_op(struct kvm_vcpu *vcpu,
return -EINVAL;
if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block))
return -E2BIG;
if (!kvm_s390_pv_cpu_is_protected(vcpu))
return -EINVAL;
switch (mop->op) {
case KVM_S390_MEMOP_SIDA_READ: