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KVM: Future-proof argument-less ioctls 

Some ioctls ignore their arguments.  By requiring them to be zero now,
we allow a nonzero value to have some special meaning in the future.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity 2007-03-07 13:11:17 +02:00
parent 07c45a366d
commit f0fe510864
1 changed files with 9 additions and 0 deletions
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9
drivers/kvm/kvm_main.c
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@ -2169,6 +2169,9 @@ static long kvm_vcpu_ioctl(struct file *filp,
switch (ioctl) {
case KVM_RUN:
r = -EINVAL;
if (arg)
goto out;
r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
break;
case KVM_GET_REGS: {
@ -2440,9 +2443,15 @@ static long kvm_dev_ioctl(struct file *filp,
switch (ioctl) {
case KVM_GET_API_VERSION:
r = -EINVAL;
if (arg)
goto out;
r = KVM_API_VERSION;
break;
case KVM_CREATE_VM:
r = -EINVAL;
if (arg)
goto out;
r = kvm_dev_ioctl_create_vm();
break;
case KVM_GET_MSR_INDEX_LIST: {