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

[Robin Murphy]

On 2022-02-02 08:12, Christoph Hellwig wrote:
> 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.

Right, if platform/hypervisor code knows enough to be able to set magic 
non-standard allocation flags correctly, surely it could equally just 
perform whatever non-standard allocation it needs and call 
swiotlb_init_with_tbl() instead of swiotlb_init().

Robin.