dma_to_phys on Intel CC platforms

[davide rossetti]

looking at https://elixir.bootlin.com/linux/v6.1-rc8/source/include/linux/dma-direct.h#L86,
it looks like it assume the AMD CC convention, i.e. CC bit set means
encrypted:

static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
{
phys_addr_t paddr;

if (dev->dma_range_map)
paddr = translate_dma_to_phys(dev, dma_addr);
else
paddr = dma_addr;

return __sme_clr(paddr);
}

What guarantees that this works on Intel too?

-- 
sincerely,
d.