Re: [RFC PATCH v2 22/69] KVM: x86: Add vm_type to differentiate legacy VMs from protected VMs

[Sean Christopherson]

On Tue, Jul 06, 2021, Paolo Bonzini wrote:
> On 03/07/21 00:04, isaku.yamahata@xxxxxxxxx wrote:
> >   struct kvm_arch {
> > +	unsigned long vm_type;
> 
> Also why not just int or u8?

Heh, because kvm_dev_ioctl_create_vm() takes an "unsigned long" for the type and
it felt wrong to store it as something else.  Storing it as a smaller field should
be fine, I highly doubt we'll get to 256 types anytime soon :-)

I think kvm_x86_ops.is_vm_type_supported() should take the full size though.