[tip: x86/sev] x86/boot: Drop unused sev_enable() fallback

tip-bot2 for Ard Biesheuvel
2025-11-20T20:26:29Z

The following commit has been merged into the x86/sev branch of tip:

Commit-ID: a3e69071289288e2721ba15254e7c5274eddd05a
Gitweb: https://git.kernel.org/tip/a3e69071289288e2721ba15254e7c5274eddd05a
Author: Ard Biesheuvel <ardb@kernel.org>
AuthorDate: Tue, 09 Sep 2025 10:06:33 +02:00
Committer: Borislav Petkov (AMD) <bp@alien8.de>
CommitterDate: Thu, 20 Nov 2025 21:12:48 +01:00

x86/boot: Drop unused sev_enable() fallback

The misc.h header is not included by the EFI stub, which is the only
C caller of sev_enable(). This means the fallback for cases where
CONFIG_AMD_MEM_ENCRYPT is not set is never used, so it can be dropped.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://patch.msgid.link/20250909080631.2867579-6-ardb+git@google.com
---
arch/x86/boot/compressed/misc.h | 11 -----------
1 file changed, 11 deletions(-)

diff --git a/arch/x86/boot/compressed/misc.h b/arch/x86/boot/compressed/misc.h
index db10486..fd855e3 100644
--- a/arch/x86/boot/compressed/misc.h
+++ b/arch/x86/boot/compressed/misc.h
@@ -152,17 +152,6 @@ bool insn_has_rep_prefix(struct insn *insn);
void sev_insn_decode_init(void);
bool early_setup_ghcb(void);
#else
-static inline void sev_enable(struct boot_params *bp)
-{
- /*
- * bp->cc_blob_address should only be set by boot/compressed kernel.
- * Initialize it to 0 unconditionally (thus here in this stub too) to
- * ensure that uninitialized values from buggy bootloaders aren't
- * propagated.
- */
- if (bp)
- bp->cc_blob_address = 0;
-}
static inline void snp_check_features(void) { }
static inline void sev_es_shutdown_ghcb(void) { }
static inline bool sev_es_check_ghcb_fault(unsigned long address)