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s390x/kvm: make flic play well with old kernels

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If we run with an old kernel that does not support KVM_CAP_IRQ_ROUTING,
we don't have to do anything in the ->register_io_adapter and
->io_adapter_map callbacks and therefore should return 0 instead of
-ENOSYS (just as the non-kvm flic does).

This fixes using adapter interrupts when running under an older kernel,
which broke with "s390x: add I/O adapter registration".

Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
This commit is contained in:
Cornelia Huck 2014-05-28 14:15:57 +02:00
parent f068d320de
commit 08da527fd0
1 changed files with 4 additions and 2 deletions
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6
hw/intc/s390_flic_kvm.c
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@ -170,7 +170,8 @@ static int kvm_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
};
if (!kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING)) {
return -ENOSYS;
/* nothing to do */
return 0;
}
r = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
@ -195,7 +196,8 @@ static int kvm_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
int r;
if (!kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING)) {
return -ENOSYS;
/* nothing to do */
return 0;
}
r = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);