Messages in this thread | | | Date | Tue, 1 Nov 2022 22:12:35 -0500 | Subject | Re: [PATCH Part2 v6 07/49] x86/sev: Invalid pages from direct map when adding it to RMP table | From | "Kalra, Ashish" <> |
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Hello Boris,
On 8/4/2022 7:11 AM, Borislav Petkov wrote: > On Mon, Aug 01, 2022 at 11:57:09PM +0000, Kalra, Ashish wrote: >> You mean set_memory_present() ? > > Right, that. > > We have set_memory_np() but set_memory_present(). Talk about > consistence... ;-\
Following up on this, now, set_memory_present() is a static interface, so will need do add a new external API like set_memory_p() similar to set_memory_np().
Also, looking at arch/x86/include/asm/set_memory.h: .. /* * The set_memory_* API can be used to change various attributes of a * virtual address range. The attributes include: * Cacheability : UnCached, WriteCombining, WriteThrough, WriteBack * Executability : eXecutable, NoteXecutable * Read/Write : ReadOnly, ReadWrite * Presence : NotPresent * Encryption : Encrypted, Decrypted * .. int set_memory_np(unsigned long addr, int numpages); ..
So currently there is no interface defined for changing the attribute of a range to present or restoring the range in the direct map.
Thanks, Ashish
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