> > ret_t do_iommu_op(XEN_GUEST_HANDLE_PARAM(void) arg, unsigned int count)
>
> Shouldn't this be changed to be pv_iommu_op_t? instead of void?
>
>
> > {
> > - return -ENOSYS;
> > + ret_t ret = 0;
> > + int i;
>
> unsigned int ?
> > + struct pv_iommu_op op;
> > + struct domain *d = current->domain;
> > +
> > + if ( !is_hardware_domain(d) )
> > + return -ENOSYS;
>
> -EPERM ?
>
> > +
Also you are missing the XSM checks which should be here.
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