Merge branch 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull EFI updates from Ingo Molnar:
 "The main changes in this cycle were:

   - Cleanup of the GOP [graphics output] handling code in the EFI stub

   - Complete refactoring of the mixed mode handling in the x86 EFI stub

   - Overhaul of the x86 EFI boot/runtime code

   - Increase robustness for mixed mode code

   - Add the ability to disable DMA at the root port level in the EFI
     stub

   - Get rid of RWX mappings in the EFI memory map and page tables,
     where possible

   - Move the support code for the old EFI memory mapping style into its
     only user, the SGI UV1+ support code.

   - plus misc fixes, updates, smaller cleanups.

  ... and due to interactions with the RWX changes, another round of PAT
  cleanups make a guest appearance via the EFI tree - with no side
  effects intended"

* 'efi-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (75 commits)
  efi/x86: Disable instrumentation in the EFI runtime handling code
  efi/libstub/x86: Fix EFI server boot failure
  efi/x86: Disallow efi=old_map in mixed mode
  x86/boot/compressed: Relax sed symbol type regex for LLVM ld.lld
  efi/x86: avoid KASAN false positives when accessing the 1: 1 mapping
  efi: Fix handling of multiple efi_fake_mem= entries
  efi: Fix efi_memmap_alloc() leaks
  efi: Add tracking for dynamically allocated memmaps
  efi: Add a flags parameter to efi_memory_map
  efi: Fix comment for efi_mem_type() wrt absent physical addresses
  efi/arm: Defer probe of PCIe backed efifb on DT systems
  efi/x86: Limit EFI old memory map to SGI UV machines
  efi/x86: Avoid RWX mappings for all of DRAM
  efi/x86: Don't map the entire kernel text RW for mixed mode
  x86/mm: Fix NX bit clearing issue in kernel_map_pages_in_pgd
  efi/libstub/x86: Fix unused-variable warning
  efi/libstub/x86: Use mandatory 16-byte stack alignment in mixed mode
  efi/libstub/x86: Use const attribute for efi_is_64bit()
  efi: Allow disabling PCI busmastering on bridges during boot
  efi/x86: Allow translating 64-bit arguments for mixed mode calls
  ...

1 files changed, 6 insertions, 37 deletions

diff --git a/arch/x86/platform/efi/efi_stub_64.S b/arch/x86/platform/efi/efi_stub_64.S
index b1d2313fe3bf..15da118f04f0 100644
--- a/arch/x86/platform/efi/efi_stub_64.S
+++ b/arch/x86/platform/efi/efi_stub_64.S
@@ -8,41 +8,12 @@
  */
 
 #include <linux/linkage.h>
-#include <asm/segment.h>
-#include <asm/msr.h>
-#include <asm/processor-flags.h>
-#include <asm/page_types.h>
+#include <asm/nospec-branch.h>
 
-#define SAVE_XMM			\
-	mov %rsp, %rax;			\
-	subq $0x70, %rsp;		\
-	and $~0xf, %rsp;		\
-	mov %rax, (%rsp);		\
-	mov %cr0, %rax;			\
-	clts;				\
-	mov %rax, 0x8(%rsp);		\
-	movaps %xmm0, 0x60(%rsp);	\
-	movaps %xmm1, 0x50(%rsp);	\
-	movaps %xmm2, 0x40(%rsp);	\
-	movaps %xmm3, 0x30(%rsp);	\
-	movaps %xmm4, 0x20(%rsp);	\
-	movaps %xmm5, 0x10(%rsp)
-
-#define RESTORE_XMM			\
-	movaps 0x60(%rsp), %xmm0;	\
-	movaps 0x50(%rsp), %xmm1;	\
-	movaps 0x40(%rsp), %xmm2;	\
-	movaps 0x30(%rsp), %xmm3;	\
-	movaps 0x20(%rsp), %xmm4;	\
-	movaps 0x10(%rsp), %xmm5;	\
-	mov 0x8(%rsp), %rsi;		\
-	mov %rsi, %cr0;			\
-	mov (%rsp), %rsp
-
-SYM_FUNC_START(efi_call)
+SYM_FUNC_START(__efi_call)
 	pushq %rbp
 	movq %rsp, %rbp
-	SAVE_XMM
+	and $~0xf, %rsp
 	mov 16(%rbp), %rax
 	subq $48, %rsp
 	mov %r9, 32(%rsp)
@@ -50,9 +21,7 @@ SYM_FUNC_START(efi_call)
 	mov %r8, %r9
 	mov %rcx, %r8
 	mov %rsi, %rcx
-	call *%rdi
-	addq $48, %rsp
-	RESTORE_XMM
-	popq %rbp
+	CALL_NOSPEC %rdi
+	leave
 	ret
-SYM_FUNC_END(efi_call)
+SYM_FUNC_END(__efi_call)