On 06/15/2018 09:06 AM, Kirill A. Shutemov wrote: > I have no idea what such concept should be called. I cannot come with > anything better than PTE_PFN_MASK_MAX. Do you? PTE_PRESERVE_MASK Or maybe: PTE_MODIFY_PRESERVE_MASK Maybe a comment to go along with it: /* * These are the bits that must be preserved during when doing a * PTE permission modification operation, like taking a PTE from * R/W->R/O. They include the physical address and the memory * encryption keyID. The paddr and the keyID never occupy the same * bits at the same time. But, a given bit might be used for the keyID * on one system and used for the physical address on another. As an * optimization, we manage them in one unit here since their combination * always occupies the same hardware bits. */
