linux-kernel - [RFC PATCH PoC 07/11] HACK: work around sev-startup.c being omitted for now

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Message-ID: <20250423110948.1103030-20-ardb+git@google.com>
Date: Wed, 23 Apr 2025 13:09:56 +0200
From: Ard Biesheuvel <ardb+git@...gle.com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org, mingo@...nel.org, Ard Biesheuvel <ardb@...nel.org>
Subject: [RFC PATCH PoC 07/11] HACK: work around sev-startup.c being omitted
 for now

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

Add some PI aliases that shouldn't be needed once sev-startup.c is also
built with __pi_ aliases.

Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
---
 arch/x86/boot/startup/sev-startup.c | 3 +++
 arch/x86/include/asm/sev.h          | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/boot/startup/sev-startup.c b/arch/x86/boot/startup/sev-startup.c
index 36a75c5096b0..7b9de4479c0c 100644
--- a/arch/x86/boot/startup/sev-startup.c
+++ b/arch/x86/boot/startup/sev-startup.c
@@ -562,6 +562,7 @@ void __head early_snp_set_memory_shared(unsigned long vaddr, unsigned long paddr
 	 /* Ask hypervisor to mark the memory pages shared in the RMP table. */
 	early_set_pages_state(vaddr, paddr, npages, SNP_PAGE_STATE_SHARED);
 }
+SYM_PI_ALIAS(early_snp_set_memory_shared);
 
 /* Writes to the SVSM CAA MSR are ignored */
 static enum es_result __vc_handle_msr_caa(struct pt_regs *regs, bool write)
@@ -1383,8 +1384,10 @@ bool __head snp_init(struct boot_params *bp)
 
 	return true;
 }
+SYM_PI_ALIAS(snp_init);
 
 void __head __noreturn snp_abort(void)
 {
 	sev_es_terminate(SEV_TERM_SET_GEN, GHCB_SNP_UNSUPPORTED);
 }
+SYM_PI_ALIAS(snp_abort);
diff --git a/arch/x86/include/asm/sev.h b/arch/x86/include/asm/sev.h
index a8661dfc9a9a..9ba1f30eb03e 100644
--- a/arch/x86/include/asm/sev.h
+++ b/arch/x86/include/asm/sev.h
@@ -494,6 +494,7 @@ void snp_set_memory_private(unsigned long vaddr, unsigned long npages);
 void snp_set_wakeup_secondary_cpu(void);
 bool snp_init(struct boot_params *bp);
 void __noreturn snp_abort(void);
+void __noreturn __pi_snp_abort(void);
 void snp_dmi_setup(void);
 int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input);
 void snp_accept_memory(phys_addr_t start, phys_addr_t end);
@@ -541,7 +542,6 @@ static inline void snp_set_memory_shared(unsigned long vaddr, unsigned long npag
 static inline void snp_set_memory_private(unsigned long vaddr, unsigned long npages) { }
 static inline void snp_set_wakeup_secondary_cpu(void) { }
 static inline bool snp_init(struct boot_params *bp) { return false; }
-static inline void snp_abort(void) { }
 static inline void snp_dmi_setup(void) { }
 static inline int snp_issue_svsm_attest_req(u64 call_id, struct svsm_call *call, struct svsm_attest_call *input)
 {
-- 
2.49.0.805.g082f7c87e0-goog