On Wed, Aug 26, 2009 at 03:40:59PM +0200, Arnd Bergmann wrote: > On Tuesday 25 August 2009, Michael S. Tsirkin wrote: > > > I'd like to avoid that here, > > > though it's kind of ugly. We'd need VHOST_GET_FEATURES (and ACK) to take a > > > struct like: > > > > > > u32 feature_size; > > > u32 features[]; > > Hmm, variable length ioctl arguments, I'd rather not go there. > The ioctl infrastructure already has a length argument encoded > in the ioctl number. We can use that if we need more, e.g. > > /* now */ > #define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64) > /* > * uncomment if we run out of feature bits: > > struct vhost_get_features2 { > __u64 bits[2]; > }; > #define VHOST_GET_FEATURES2 _IOR(VHOST_VIRTIO, 0x00, \ > struct vhost_get_features2) > */ I thought so, too. Rusty, agree? -- MST -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html