Re: [PATCH 0/2] x86/hyperv/Swiotlb: Add swiotlb_alloc_from_low_pages switch

[Christoph Hellwig]

I think this interface is a little too hacky.  In the end all the
non-trusted hypervisor schemes (including the per-device swiotlb one)
can allocate the memory from everywhere and want for force use of
swiotlb.  I think we need some kind of proper interface for that instead
of setting all kinds of global variables.