x86_swiotlb_flags
swiotlb_init(x86_swiotlb_enable, x86_swiotlb_flags);
static unsigned int x86_swiotlb_flags;
x86_swiotlb_flags |= SWIOTLB_FORCE;
x86_swiotlb_flags |= SWIOTLB_ANY;
swiotlb_init_remap(true, x86_swiotlb_flags, xen_swiotlb_fixup);