linux-kernel - [PATCH v4 05/11] x86/boot: Move early SME init code into startup/

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Message-ID: <20250410134117.3713574-18-ardb+git@google.com>
Date: Thu, 10 Apr 2025 15:41:23 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-efi@...r.kernel.org
Cc: x86@...nel.org, mingo@...nel.org, linux-kernel@...r.kernel.org, 
	Ard Biesheuvel <ardb@...nel.org>, Tom Lendacky <thomas.lendacky@....com>, 
	Dionna Amalie Glaze <dionnaglaze@...gle.com>, Kevin Loughlin <kevinloughlin@...gle.com>
Subject: [PATCH v4 05/11] x86/boot: Move early SME init code into startup/

From: Ard Biesheuvel <ardb@...nel.org>

Move the SME initialization code, which runs from the 1:1 mapping of
memory as it operates on the kernel virtual mapping, into the new
sub-directory arch/x86/boot/startup/ where all startup code will reside
that needs to tolerate executing from the 1:1 mapping.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/x86/boot/startup/Makefile                             | 1 +
 arch/x86/{mm/mem_encrypt_identity.c => boot/startup/sme.c} | 2 --
 arch/x86/mm/Makefile                                       | 6 ------
 3 files changed, 1 insertion(+), 8 deletions(-)

diff --git a/arch/x86/boot/startup/Makefile b/arch/x86/boot/startup/Makefile
index 10319aee666b..ccdfc42a4d59 100644
--- a/arch/x86/boot/startup/Makefile
+++ b/arch/x86/boot/startup/Makefile
@@ -16,6 +16,7 @@ UBSAN_SANITIZE	:= n
 KCOV_INSTRUMENT	:= n
 
 obj-$(CONFIG_X86_64)		+= gdt_idt.o map_kernel.o
+obj-$(CONFIG_AMD_MEM_ENCRYPT)	+= sme.o
 
 lib-$(CONFIG_X86_64)		+= la57toggle.o
 lib-$(CONFIG_EFI_MIXED)		+= efi-mixed.o
diff --git a/arch/x86/mm/mem_encrypt_identity.c b/arch/x86/boot/startup/sme.c
similarity index 99%
rename from arch/x86/mm/mem_encrypt_identity.c
rename to arch/x86/boot/startup/sme.c
index e7fb3779b35f..23d10cda5b58 100644
--- a/arch/x86/mm/mem_encrypt_identity.c
+++ b/arch/x86/boot/startup/sme.c
@@ -45,8 +45,6 @@
 #include <asm/coco.h>
 #include <asm/sev.h>
 
-#include "mm_internal.h"
-
 #define PGD_FLAGS		_KERNPG_TABLE_NOENC
 #define P4D_FLAGS		_KERNPG_TABLE_NOENC
 #define PUD_FLAGS		_KERNPG_TABLE_NOENC
diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile
index 32035d5be5a0..3faa60f13a61 100644
--- a/arch/x86/mm/Makefile
+++ b/arch/x86/mm/Makefile
@@ -3,12 +3,10 @@
 KCOV_INSTRUMENT_tlb.o			:= n
 KCOV_INSTRUMENT_mem_encrypt.o		:= n
 KCOV_INSTRUMENT_mem_encrypt_amd.o	:= n
-KCOV_INSTRUMENT_mem_encrypt_identity.o	:= n
 KCOV_INSTRUMENT_pgprot.o		:= n
 
 KASAN_SANITIZE_mem_encrypt.o		:= n
 KASAN_SANITIZE_mem_encrypt_amd.o	:= n
-KASAN_SANITIZE_mem_encrypt_identity.o	:= n
 KASAN_SANITIZE_pgprot.o		:= n
 
 # Disable KCSAN entirely, because otherwise we get warnings that some functions
@@ -16,12 +14,10 @@ KASAN_SANITIZE_pgprot.o		:= n
 KCSAN_SANITIZE := n
 # Avoid recursion by not calling KMSAN hooks for CEA code.
 KMSAN_SANITIZE_cpu_entry_area.o := n
-KMSAN_SANITIZE_mem_encrypt_identity.o := n
 
 ifdef CONFIG_FUNCTION_TRACER
 CFLAGS_REMOVE_mem_encrypt.o		= -pg
 CFLAGS_REMOVE_mem_encrypt_amd.o		= -pg
-CFLAGS_REMOVE_mem_encrypt_identity.o	= -pg
 CFLAGS_REMOVE_pgprot.o			= -pg
 endif
 
@@ -32,7 +28,6 @@ obj-y				+= pat/
 
 # Make sure __phys_addr has no stackprotector
 CFLAGS_physaddr.o		:= -fno-stack-protector
-CFLAGS_mem_encrypt_identity.o	:= -fno-stack-protector
 
 CFLAGS_fault.o := -I $(src)/../include/asm/trace
 
@@ -63,5 +58,4 @@ obj-$(CONFIG_MITIGATION_PAGE_TABLE_ISOLATION)	+= pti.o
 obj-$(CONFIG_X86_MEM_ENCRYPT)	+= mem_encrypt.o
 obj-$(CONFIG_AMD_MEM_ENCRYPT)	+= mem_encrypt_amd.o
 
-obj-$(CONFIG_AMD_MEM_ENCRYPT)	+= mem_encrypt_identity.o
 obj-$(CONFIG_AMD_MEM_ENCRYPT)	+= mem_encrypt_boot.o
-- 
2.49.0.504.g3bcea36a83-goog