x86/sev: Export startup routines for later use

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@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/20250828102202.1849035-38-ardb+git@google.com

diff --git a/arch/x86/boot/startup/exports.h b/arch/x86/boot/startup/exports.h
new file mode 100644 (file)
index 0000000..01d2363
--- /dev/null
+++ b/arch/x86/boot/startup/exports.h
@@ -0,0 +1,14 @@
+
+/*
+ * 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);
+PROVIDE(svsm_issue_call                        = __pi_svsm_issue_call);
+PROVIDE(svsm_process_result_codes      = __pi_svsm_process_result_codes);

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 4fa0be732af10fa7143cad037f38d90405e84ff4..5d5e3a95e1f9bf4f51d5191c475fc98639b7725b 100644 (file)
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -535,3 +535,5 @@ 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"