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KVM: s390: mark irq_state.flags as non-usable

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Old kernels did not check for zero in the irq_state.flags field and old
QEMUs did not zero the flag/reserved fields when calling
KVM_S390_*_IRQ_STATE.  Let's add comments to prevent future uses of
these fields.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Christian Borntraeger
2017-11-21 16:02:52 +01:00
parent 940f89a5a3
commit bb64da9aba
3 changed files with 18 additions and 7 deletions
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4
include/uapi/linux/kvm.h
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@@ -630,9 +630,9 @@ struct kvm_s390_irq {
struct kvm_s390_irq_state {
__u64 buf;
__u32 flags;
__u32 flags; /* will stay unused for compatibility reasons */
__u32 len;
__u32 reserved[4];
__u32 reserved[4]; /* will stay unused for compatibility reasons */
};
/* for KVM_SET_GUEST_DEBUG */