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KVM: s390: protvirt: disallow one_reg

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A lot of the registers are controlled by the Ultravisor and never
visible to KVM. Some fields in the sie control block are overlayed, like
gbea. As no known userspace uses the ONE_REG interface on s390 if sync
regs are available, no functionality is lost if it is disabled for
protected guests.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Janosch Frank 2019-06-14 13:11:21 +02:00 committed by Christian Borntraeger
parent 353cbc6a5b
commit 68cf7b1f13
2 changed files with 7 additions and 2 deletions
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6
Documentation/virt/kvm/api.rst
View File

@ -2117,7 +2117,8 @@ Errors:
====== ============================================================
 ENOENT   no such register
 EINVAL   invalid register ID, or no such register
 EINVAL   invalid register ID, or no such register or used with VMs in
protected virtualization mode on s390
 EPERM    (arm64) register access not allowed before vcpu finalization
====== ============================================================
@ -2552,7 +2553,8 @@ Errors include:
======== ============================================================
 ENOENT   no such register
 EINVAL   invalid register ID, or no such register
 EINVAL   invalid register ID, or no such register or used with VMs in
protected virtualization mode on s390
 EPERM    (arm64) register access not allowed before vcpu finalization
======== ============================================================

3
arch/s390/kvm/kvm-s390.c
View File

@ -4674,6 +4674,9 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
case KVM_SET_ONE_REG:
case KVM_GET_ONE_REG: {
struct kvm_one_reg reg;
r = -EINVAL;
if (kvm_s390_pv_cpu_is_protected(vcpu))
break;
r = -EFAULT;
if (copy_from_user(&reg, argp, sizeof(reg)))
break;