linux-kernel - [PATCH] x86/efi: select ARCH_USE_MEMREMAP

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Message-Id: <20211204174156.977245-1-arnd@kernel.org>
Date:   Sat,  4 Dec 2021 18:41:10 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Ard Biesheuvel <ardb@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>
Cc:     Arnd Bergmann <arnd@...db.de>, "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] x86/efi: select ARCH_USE_MEMREMAP_PROT

From: Arnd Bergmann <arnd@...db.de>

The patch to map the EFI memmap as encrypted introduces a
link failure in configurations without encryption support:

x86_64-linux-ld: arch/x86/platform/efi/quirks.o: in function `efi_arch_mem_reserve':
quirks.c:(.init.text+0x127): undefined reference to `early_memremap_prot'

Select the necessary symbol here as well to fix the build.

Fixes: 8f1dd76c9b55 ("x86/sme: Explicitly map new EFI memmap table as encrypted")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/x86/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 05362527f6b5..93befe25d787 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1934,6 +1934,7 @@ config EFI
 	depends on ACPI
 	select UCS2_STRING
 	select EFI_RUNTIME_WRAPPERS
+	select ARCH_USE_MEMREMAP_PROT
 	help
 	  This enables the kernel to use EFI runtime services that are
 	  available (such as the EFI variable services).
-- 
2.29.2