On 03/22/2016 08:03 AM, Pavel Machek wrote: > On Tue 2016-04-26 17:56:26, Tom Lendacky wrote: >> Provide support for Secure Memory Encryption (SME). This initial support >> defines the memory encryption mask as a variable for quick access and an >> accessor for retrieving the number of physical addressing bits lost if >> SME is enabled. >> >> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx> >> --- >> arch/x86/include/asm/mem_encrypt.h | 37 ++++++++++++++++++++++++++++++++++++ >> arch/x86/kernel/Makefile | 2 ++ >> arch/x86/kernel/mem_encrypt.S | 29 ++++++++++++++++++++++++++++ >> arch/x86/kernel/x8664_ksyms_64.c | 6 ++++++ >> 4 files changed, 74 insertions(+) >> create mode 100644 arch/x86/include/asm/mem_encrypt.h >> create mode 100644 arch/x86/kernel/mem_encrypt.S >> >> index 0000000..ef7f325 >> --- /dev/null >> +++ b/arch/x86/kernel/mem_encrypt.S >> @@ -0,0 +1,29 @@ >> +/* >> + * AMD Memory Encryption Support >> + * >> + * Copyright (C) 2016 Advanced Micro Devices, Inc. >> + * >> + * Author: Tom Lendacky <thomas.lendacky@xxxxxxx> >> + * >> + * This program is free software; you can redistribute it and/or modify >> + * it under the terms of the GNU General Public License version 2 as >> + * published by the Free Software Foundation. >> + */ >> + >> +#include <linux/linkage.h> >> + >> + .text >> + .code64 >> +ENTRY(sme_get_me_loss) >> + xor %rax, %rax >> + mov sme_me_loss(%rip), %al >> + ret >> +ENDPROC(sme_get_me_loss) > > Does this really need to be implemented in assembly? That particular routine probably doesn't need to be in assembly. But since it was such a simple routine I put it there because a later patch derives the value in this file. Thanks, Tom > > -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
