Re: [RFC PATCH v4 07/28] x86: Provide general kernel support for memory encryption

From: Tom Lendacky
Date: Wed Feb 22 2017 - 11:44:03 EST

On 2/20/2017 12:38 PM, Borislav Petkov wrote:
On Thu, Feb 16, 2017 at 09:43:32AM -0600, Tom Lendacky wrote:
Adding general kernel support for memory encryption includes:
- Modify and create some page table macros to include the Secure Memory
Encryption (SME) memory encryption mask
- Modify and create some macros for calculating physical and virtual
memory addresses
- Provide an SME initialization routine to update the protection map with
the memory encryption mask so that it is used by default
- #undef CONFIG_AMD_MEM_ENCRYPT in the compressed boot path

Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>


+#define __sme_pa(x) (__pa((x)) | sme_me_mask)
+#define __sme_pa_nodebug(x) (__pa_nodebug((x)) | sme_me_mask)

#ifndef sme_me_mask
@@ -35,6 +42,13 @@ static inline bool sme_active(void)

+static inline void __init sme_early_init(void)
+#define __sme_pa __pa
+#define __sme_pa_nodebug __pa_nodebug

One more thing - in the !CONFIG_AMD_MEM_ENCRYPT case, sme_me_mask is 0
so you don't need to define __sme_pa* again.

Makes sense. I'll move those macros outside the #ifdef (I'll do the
same for the new __sme_clr() and __sme_set() macros, too).