linux-kernel - [PATCH] x86/sev: Add ENCODE_FRAME_POINTER after stack changed for #VC

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Date:   Wed, 16 Mar 2022 12:16:12 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     x86@...nel.org, Lai Jiangshan <jiangshan.ljs@...group.com>,
        Joerg Roedel <jroedel@...e.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH] x86/sev: Add ENCODE_FRAME_POINTER after stack changed for #VC

From: Lai Jiangshan <jiangshan.ljs@...group.com>

In idtentry_vc(), the real frame is changed after it switches to new
stack, ENCODE_FRAME_POINTER should be called in case for unwinder.

Cc: Joerg Roedel <jroedel@...e.de>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Signed-off-by: Lai Jiangshan <jiangshan.ljs@...group.com>
---
 arch/x86/entry/entry_64.S | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index e20eabaa56b8..f99f2881ed83 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -540,6 +540,7 @@ SYM_CODE_START(\asmsym)
 	call	vc_switch_off_ist
 	movq	%rax, %rsp		/* Switch to new stack */
 
+	ENCODE_FRAME_POINTER
 	UNWIND_HINT_REGS
 
 	/* Update pt_regs */
-- 
2.19.1.6.gb485710b