x86/sev: Move SEV compilation units

A long time ago it was agreed upon that the coco stuff needs to go where
it belongs:

  https://lore.kernel.org/all/Yg5nh1RknPRwIrb8@zn.tnic

and not keep it in arch/x86/kernel. TDX did that and SEV can't find time
to do so. So lemme do it. If people have trouble converting their
ongoing featuritis patches, ask me for a sed script.

No functional changes.

Move the instrumentation exclusion bits too, as helpfully caught and
reported by the 0day folks.

Closes: https://lore.kernel.org/oe-kbuild-all/202406220748.hG3qlmDx-lkp@intel.com
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202407091342.46d7dbb-oliver.sang@intel.com
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Nikunj A Dadhania <nikunj@amd.com>
Reviewed-by: Ashish Kalra <ashish.kalra@amd.com>
Tested-by: kernel test robot <oliver.sang@intel.com>
Link: https://lore.kernel.org/r/20240619093014.17962-1-bp@kernel.org

arch/x86/boot/compressed/sev.c

@@ -127,7 +127,7 @@ static bool fault_in_kernel_space(unsigned long address)
 #include "../../lib/insn.c"
 
 /* Include code for early handlers */
-#include "../../kernel/sev-shared.c"
+#include "../../coco/sev/shared.c"
 
 static struct svsm_ca *svsm_get_caa(void)
 {

arch/x86/coco/Makefile

@@ -6,3 +6,4 @@ CFLAGS_core.o		+= -fno-stack-protector
 obj-y += core.o
 
 obj-$(CONFIG_INTEL_TDX_GUEST)	+= tdx/
+obj-$(CONFIG_AMD_MEM_ENCRYPT)   += sev/

arch/x86/coco/sev/Makefile

@@ -0,0 +1,15 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-y += core.o
+
+ifdef CONFIG_FUNCTION_TRACER
+CFLAGS_REMOVE_core.o = -pg
+endif
+
+KASAN_SANITIZE_core.o	:= n
+KMSAN_SANITIZE_core.o	:= n
+KCOV_INSTRUMENT_core.o	:= n
+
+# With some compiler versions the generated code results in boot hangs, caused
+# by several compilation units. To be safe, disable all instrumentation.
+KCSAN_SANITIZE		:= n

arch/x86/coco/sev/core.c

@@ -613,7 +613,7 @@ static __always_inline void vc_forward_exception(struct es_em_ctxt *ctxt)
 }
 
 /* Include code shared with pre-decompression boot stage */
-#include "sev-shared.c"
+#include "shared.c"
 
 static inline struct svsm_ca *svsm_get_caa(void)
 {

arch/x86/kernel/Makefile

@@ -17,7 +17,6 @@ CFLAGS_REMOVE_ftrace.o = -pg
 CFLAGS_REMOVE_early_printk.o = -pg
 CFLAGS_REMOVE_head64.o = -pg
 CFLAGS_REMOVE_head32.o = -pg
-CFLAGS_REMOVE_sev.o = -pg
 CFLAGS_REMOVE_rethook.o = -pg
 endif
 
@@ -26,19 +25,16 @@ KASAN_SANITIZE_dumpstack.o				:= n
 KASAN_SANITIZE_dumpstack_$(BITS).o			:= n
 KASAN_SANITIZE_stacktrace.o				:= n
 KASAN_SANITIZE_paravirt.o				:= n
-KASAN_SANITIZE_sev.o					:= n
 
 # With some compiler versions the generated code results in boot hangs, caused
 # by several compilation units. To be safe, disable all instrumentation.
 KCSAN_SANITIZE := n
 KMSAN_SANITIZE_head$(BITS).o				:= n
 KMSAN_SANITIZE_nmi.o					:= n
-KMSAN_SANITIZE_sev.o					:= n
 
 # If instrumentation of the following files is enabled, boot hangs during
 # first second.
 KCOV_INSTRUMENT_head$(BITS).o				:= n
-KCOV_INSTRUMENT_sev.o					:= n
 
 CFLAGS_irq.o := -I $(src)/../include/asm/trace
 
@@ -142,8 +138,6 @@ obj-$(CONFIG_UNWINDER_ORC)		+= unwind_orc.o
 obj-$(CONFIG_UNWINDER_FRAME_POINTER)	+= unwind_frame.o
 obj-$(CONFIG_UNWINDER_GUESS)		+= unwind_guess.o
 
-obj-$(CONFIG_AMD_MEM_ENCRYPT)		+= sev.o
-
 obj-$(CONFIG_CFI_CLANG)			+= cfi.o
 
 obj-$(CONFIG_CALL_THUNKS)		+= callthunks.o