linux-kernel - [RFT PATCH v3 16/21] x86/sev: Export startup routines for later use

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Message-ID: <20250512190834.332684-39-ardb+git@google.com>
Date: Mon, 12 May 2025 21:08:51 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: linux-efi@...r.kernel.org, x86@...nel.org, 
	Ard Biesheuvel <ardb@...nel.org>, Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...nel.org>, 
	Dionna Amalie Glaze <dionnaglaze@...gle.com>, Kevin Loughlin <kevinloughlin@...gle.com>, 
	Tom Lendacky <thomas.lendacky@....com>
Subject: [RFT PATCH v3 16/21] x86/sev: Export startup routines for later use

From: Ard Biesheuvel <ardb@...nel.org>

Create aliases that expose routines that are part of the startup code to
other code in the core kernel, so that they can be called later as well.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/x86/boot/startup/exports.h | 12 ++++++++++++
 arch/x86/kernel/vmlinux.lds.S   |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/arch/x86/boot/startup/exports.h b/arch/x86/boot/startup/exports.h
new file mode 100644
index 000000000000..00ea376fde33
--- /dev/null
+++ b/arch/x86/boot/startup/exports.h
@@ -0,0 +1,12 @@
+
+/*
+ * The symbols below are functions that are implemented by the startup code,
+ * but called at runtime by the SEV code residing in the core kernel.
+ */
+PROVIDE(early_set_pages_state		= __pi_early_set_pages_state);
+PROVIDE(early_snp_set_memory_private	= __pi_early_snp_set_memory_private);
+PROVIDE(early_snp_set_memory_shared	= __pi_early_snp_set_memory_shared);
+PROVIDE(get_hv_features			= __pi_get_hv_features);
+PROVIDE(sev_es_terminate		= __pi_sev_es_terminate);
+PROVIDE(snp_cpuid			= __pi_snp_cpuid);
+PROVIDE(snp_cpuid_get_table		= __pi_snp_cpuid_get_table);
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 9340c74b680d..4aaa1693b262 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -517,3 +517,5 @@ xen_elfnote_entry_value =
 xen_elfnote_phys32_entry_value =
 	ABSOLUTE(xen_elfnote_phys32_entry) + ABSOLUTE(pvh_start_xen - LOAD_OFFSET);
 #endif
+
+#include "../boot/startup/exports.h"
-- 
2.49.0.1045.g170613ef41-goog