linux-kernel - [PATCH 20/29] x86/ibt,sev: Annotations

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Date:   Fri, 18 Feb 2022 17:49:22 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        jpoimboe@...hat.com, andrew.cooper3@...rix.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        ndesaulniers@...gle.com, keescook@...omium.org,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com
Subject: [PATCH 20/29] x86/ibt,sev: Annotations

No IBT on AMD so far.. probably correct, who knows.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/entry/entry_64.S        |    1 +
 arch/x86/entry/entry_64_compat.S |    1 +
 arch/x86/kernel/head_64.S        |    1 +
 3 files changed, 3 insertions(+)

--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -96,6 +96,7 @@ SYM_CODE_START(entry_SYSCALL_64)
 	movq	PER_CPU_VAR(cpu_current_top_of_stack), %rsp
 
 SYM_INNER_LABEL(entry_SYSCALL_64_safe_stack, SYM_L_GLOBAL)
+	ANNOTATE_NOENDBR
 
 	/* Construct struct pt_regs on stack */
 	pushq	$__USER_DS				/* pt_regs->ss */
--- a/arch/x86/entry/entry_64_compat.S
+++ b/arch/x86/entry/entry_64_compat.S
@@ -214,6 +214,7 @@ SYM_CODE_START(entry_SYSCALL_compat)
 	movq	PER_CPU_VAR(cpu_current_top_of_stack), %rsp
 
 SYM_INNER_LABEL(entry_SYSCALL_compat_safe_stack, SYM_L_GLOBAL)
+	ANNOTATE_NOENDBR
 
 	/* Construct struct pt_regs on stack */
 	pushq	$__USER32_DS		/* pt_regs->ss */
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -440,6 +440,7 @@ SYM_CODE_END(early_idt_handler_common)
  */
 SYM_CODE_START_NOALIGN(vc_no_ghcb)
 	UNWIND_HINT_IRET_REGS offset=8
+	ENDBR
 
 	/* Build pt_regs */
 	PUSH_AND_CLEAR_REGS