Merge tag 'efi-next-for-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi

Pull EFI updates from Ard Biesheuvel:

 - Decouple mixed mode startup code from the traditional x86
   decompressor

 - Revert zero-length file hack in efivarfs

 - Prevent EFI zboot from using the CopyMem/SetMem boot services after
   ExitBootServices()

 - Update EFI zboot to use the ZLIB/ZSTD library interfaces directly

* tag 'efi-next-for-v6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi:
  efi/libstub: Avoid legacy decompressor zlib/zstd wrappers
  efi/libstub: Avoid CopyMem/SetMem EFI services after ExitBootServices
  efi: efibc: change kmalloc(size * count, ...) to kmalloc_array()
  efivarfs: Revert "allow creation of zero length files"
  x86/efi/mixed: Move mixed mode startup code into libstub
  x86/efi/mixed: Simplify and document thunking logic
  x86/efi/mixed: Remove dependency on legacy startup_32 code
  x86/efi/mixed: Set up 1:1 mapping of lower 4GiB in the stub
  x86/efi/mixed: Factor out and clean up long mode entry
  x86/efi/mixed: Check CPU compatibility without relying on verify_cpu()
  x86/efistub: Merge PE and handover entrypoints

Author: torvalds

arch/x86/boot/compressed/Makefile

@@ -106,7 +106,6 @@ vmlinux-objs-$(CONFIG_INTEL_TDX_GUEST) += $(obj)/tdx.o $(obj)/tdcall.o $(obj)/td
 vmlinux-objs-$(CONFIG_UNACCEPTED_MEMORY) += $(obj)/mem.o
 
 vmlinux-objs-$(CONFIG_EFI) += $(obj)/efi.o
-vmlinux-objs-$(CONFIG_EFI_MIXED) += $(obj)/efi_mixed.o
 vmlinux-libs-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
 
 $(obj)/vmlinux: $(vmlinux-objs-y) $(vmlinux-libs-y) FORCE

arch/x86/boot/compressed/efi_mixed.S

@@ -263,13 +263,6 @@ SYM_FUNC_START(startup_32)
 	 * used to perform that far jump.
 	 */
 	leal	rva(startup_64)(%ebp), %eax
-#ifdef CONFIG_EFI_MIXED
-	cmpb	$1, rva(efi_is64)(%ebp)
-	je	1f
-	leal	rva(startup_64_mixed_mode)(%ebp), %eax
-1:
-#endif
-
 	pushl	$__KERNEL_CS
 	pushl	%eax
 

arch/x86/boot/compressed/head_64.S

@@ -47,7 +47,7 @@ static int efibc_reboot_notifier_call(struct notifier_block *notifier,
 	if (ret || !data)
 		return NOTIFY_DONE;
 
-	wdata = kmalloc(MAX_DATA_LEN * sizeof(efi_char16_t), GFP_KERNEL);
+	wdata = kmalloc_array(MAX_DATA_LEN, sizeof(efi_char16_t), GFP_KERNEL);
 	if (!wdata)
 		return NOTIFY_DONE;