dma_to_phys on Intel CC platforms
From: davide rossetti
Date: Fri Dec 09 2022 - 16:47:31 EST
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.