linux.git/arch/x86/kernel/relocate_kernel_64.S, branch v6.0

x86/kexec: Disable RET on kexec

2022-07-09T11:12:32+00:00

All the invocations unroll to __x86_return_thunk and this file
must be PIC independent.

This fixes kexec on 64-bit AMD boxes.

  [ bp: Fix 32-bit build. ]

Reported-by: Edward Tran 
Reported-by: Awais Tanveer 
Suggested-by: Ankur Arora 
Signed-off-by: Konrad Rzeszutek Wilk 
Signed-off-by: Alexandre Chartre 
Signed-off-by: Borislav Petkov

x86/ibt: Annotate text references

2022-03-15T09:32:40+00:00

Annotate away some of the generic code references. This is things
where we take the address of a symbol for exception handling or return
addresses (eg. context switch).

Signed-off-by: Peter Zijlstra (Intel) 
Acked-by: Josh Poimboeuf 
Link: https://lore.kernel.org/r/20220308154318.877758523@infradead.org

x86/ibt,kexec: Disable CET on kexec

2022-03-15T09:32:39+00:00

Signed-off-by: Peter Zijlstra (Intel) 
Acked-by: Josh Poimboeuf 
Link: https://lore.kernel.org/r/20220308154318.641454603@infradead.org

x86: Prepare asm files for straight-line-speculation

2021-12-08T11:25:37+00:00

Replace all ret/retq instructions with RET in preparation of making
RET a macro. Since AS is case insensitive it's a big no-op without
RET defined.

  find arch/x86/ -name \*.S | while read file
  do
	sed -i 's/\/RET/' $file
  done

Signed-off-by: Peter Zijlstra (Intel) 
Signed-off-by: Borislav Petkov 
Link: https://lore.kernel.org/r/20211204134907.905503893@infradead.org

x86/sme: Replace occurrences of sme_active() with cc_platform_has()

2021-10-04T09:46:46+00:00

Replace uses of sme_active() with the more generic cc_platform_has()
using CC_ATTR_HOST_MEM_ENCRYPT. If future support is added for other
memory encryption technologies, the use of CC_ATTR_HOST_MEM_ENCRYPT
can be updated, as required.

This also replaces two usages of sev_active() that are really geared
towards detecting if SME is active.

Signed-off-by: Tom Lendacky 
Signed-off-by: Borislav Petkov 
Link: https://lkml.kernel.org/r/20210928191009.32551-6-bp@alien8.de

x86: Fix various typos in comments, take #2

2021-03-21T22:50:28+00:00

Fix another ~42 single-word typos in arch/x86/ code comments,
missed a few in the first pass, in particular in .S files.

Signed-off-by: Ingo Molnar 
Cc: Borislav Petkov 
Cc: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: Paolo Bonzini 
Cc: Bjorn Helgaas 
Cc: linux-kernel@vger.kernel.org

x86/kexec: Make relocate_kernel_64.S objtool clean

2020-03-25T17:28:28+00:00

Having fixed the biggest objtool issue in this file; fix up the rest
and remove the exception.

Suggested-by: Josh Poimboeuf 
Signed-off-by: Peter Zijlstra (Intel) 
Reviewed-by: Miroslav Benes 
Acked-by: Josh Poimboeuf 
Link: https://lkml.kernel.org/r/20200324160924.202621656@infradead.org

x86/kexec: Use RIP relative addressing

2020-03-25T17:28:27+00:00

Normally identity_mapped is not visible to objtool, due to:

  arch/x86/kernel/Makefile:OBJECT_FILES_NON_STANDARD_relocate_kernel_$(BITS).o := y

However, when we want to run objtool on vmlinux.o there is no hiding
it:

  vmlinux.o: warning: objtool: .text+0x4c0f1: unsupported intra-function call

Replace the (i386 inspired) pattern:

	call 1f
  1:	popq %r8
	subq $(1b - relocate_kernel), %r8

With a x86_64 RIP-relative LEA:

	leaq relocate_kernel(%rip), %r8

Suggested-by: Brian Gerst 
Signed-off-by: Peter Zijlstra (Intel) 
Reviewed-by: Miroslav Benes 
Acked-by: Josh Poimboeuf 
Link: https://lkml.kernel.org/r/20200324160924.143334345@infradead.org

x86/asm: Annotate relocate_kernel_{32,64}.c

2019-10-18T07:53:19+00:00

There are functions in relocate_kernel_{32,64}.c which are not
annotated. This makes automatic annotations on them rather hard. So
annotate all the functions now.

Note that these are not C-like functions, so FUNC is not used. Instead
CODE markers are used. Also the functions are not aligned, so the
NOALIGN versions are used:

- SYM_CODE_START_NOALIGN
- SYM_CODE_START_LOCAL_NOALIGN
- SYM_CODE_END

The result is:
  0000   108 NOTYPE  GLOBAL DEFAULT    1 relocate_kernel
  006c   165 NOTYPE  LOCAL  DEFAULT    1 identity_mapped
  0146   127 NOTYPE  LOCAL  DEFAULT    1 swap_pages
  0111    53 NOTYPE  LOCAL  DEFAULT    1 virtual_mapped

Signed-off-by: Jiri Slaby 
Signed-off-by: Borislav Petkov 
Cc: Alexios Zavras 
Cc: Allison Randal 
Cc: Enrico Weigelt 
Cc: Greg Kroah-Hartman 
Cc: "H. Peter Anvin" 
Cc: Ingo Molnar 
Cc: linux-arch@vger.kernel.org
Cc: Thomas Gleixner 
Cc: x86-ml 
Link: https://lkml.kernel.org/r/20191011115108.12392-4-jslaby@suse.cz

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230

2019-06-19T15:09:06+00:00

Based on 2 normalized pattern(s):

  this source code is licensed under the gnu general public license
  version 2 see the file copying for more details

  this source code is licensed under general public license version 2
  see

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 52 file(s).

Signed-off-by: Thomas Gleixner 
Reviewed-by: Enrico Weigelt 
Reviewed-by: Allison Randal 
Reviewed-by: Alexios Zavras 
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190602204653.449021192@linutronix.de
Signed-off-by: Greg Kroah-Hartman