The way this sort of thing is defined in the rest of domctl.h is like this:
#define _XEN_DOMCTL_CDF_hvm_guest 0
#define XEN_DOMCTL_CDF_hvm_guest (1U<<_XEN_DOMCTL_CDF_hvm_guest)
So the above should be
#define _XEN_DOMCTL_DEV_RDM_RELAXED 0
#define XEN_DOMCTL_DEV_RDM_RELAXED (1U<<_XEN_DOMCTL_DEV_RDM_RELAXED)
And then your check in iommu_do_pci_domctl() would look like
if (flag & ~XEN_DOMCTL_DEV_RDM_RELAXED)
And if we end up adding any extra flags, we just | them into the above
conditional, as is done in, for example, the XEN_DOMCTL_createdomain
case in xen/common/domctl.c:do_domctl().
Seems Jan didn't like this way IIRC, so I hope Jan also can have a look
at this beforehand :)
Thanks
Tiejun
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