Re: [PATCH 02/61] KVM: x86: Refactor loop around do_cpuid_func() to separate helper

[Paolo Bonzini]

On 07/02/20 20:53, Sean Christopherson wrote:
> 
>> 2) Return -EINVAL instead.
> I agree that it _should_ be -EINVAL, but I just don't think it's worth
> the possibility of breaking (stupid) userspace that was doing something
> like:
> 
> 	for (i = 0; i < max_cpuid_size; i++) {
> 		cpuid.nent = i;
> 
> 		r = ioctl(fd, KVM_GET_SUPPORTED_CPUID, &cpuid);
> 		if (!r || r != -E2BIG)
> 			break;
> 	}
> 

Apart from the stupidity of the above case, why would it be EINVAL?

I can do the change to drop the initializer when applying.

Paolo