On Fri, Jun 16, 2017 at 01:51:15PM -0500, Tom Lendacky wrote:
> Add support to the early boot code to use Secure Memory Encryption (SME).
> Since the kernel has been loaded into memory in a decrypted state, encrypt
> the kernel in place and update the early pagetables with the memory
> encryption mask so that new pagetable entries will use memory encryption.
>
> The routines to set the encryption mask and perform the encryption are
> stub routines for now with functionality to be added in a later patch.
>
> Because of the need to have the routines available to head_64.S, the
> mem_encrypt.c is always built and #ifdefs in mem_encrypt.c will provide
> functionality or stub routines depending on CONFIG_AMD_MEM_ENCRYPT.
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
> ---
> arch/x86/include/asm/mem_encrypt.h | 8 +++++++
> arch/x86/kernel/head64.c | 33 +++++++++++++++++++++---------
> arch/x86/kernel/head_64.S | 39 ++++++++++++++++++++++++++++++++++--
> arch/x86/mm/Makefile | 4 +---
> arch/x86/mm/mem_encrypt.c | 24 ++++++++++++++++++++++
> 5 files changed, 93 insertions(+), 15 deletions(-)
...
> diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c
> index b99d469..9a78277 100644
> --- a/arch/x86/mm/mem_encrypt.c
> +++ b/arch/x86/mm/mem_encrypt.c
> @@ -11,6 +11,9 @@
> */
>
> #include <linux/linkage.h>
> +#include <linux/init.h>
> +
> +#ifdef CONFIG_AMD_MEM_ENCRYPT
>
> /*
> * Since SME related variables are set early in the boot process they must
> @@ -19,3 +22,24 @@
> */
> unsigned long sme_me_mask __section(.data) = 0;
> EXPORT_SYMBOL_GPL(sme_me_mask);
> +
> +void __init sme_encrypt_kernel(void)
> +{
> +}
Just the minor:
void __init sme_encrypt_kernel(void) { }
in case you have to respin.
Reviewed-by: Borislav Petkov <bp@xxxxxxx>
--
Regards/Gruss,
Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
