From: Lai Jiangshan <jiangshanlai@gmail.com>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, Lai Jiangshan <jiangshan.ljs@antgroup.com>,
Joerg Roedel <jroedel@suse.de>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH] x86/sev: Add ENCODE_FRAME_POINTER after stack changed for #VC
Date: Wed, 16 Mar 2022 12:16:12 +0800 [thread overview]
Message-ID: <20220316041612.71357-1-jiangshanlai@gmail.com> (raw)
From: Lai Jiangshan <jiangshan.ljs@antgroup.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@suse.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Lai Jiangshan <jiangshan.ljs@antgroup.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
next reply other threads:[~2022-03-16 4:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-16 4:16 Lai Jiangshan [this message]
2022-03-17 22:19 ` [PATCH] x86/sev: Add ENCODE_FRAME_POINTER after stack changed for #VC Josh Poimboeuf
2022-03-18 1:14 ` Lai Jiangshan
2022-03-18 17:03 ` Josh Poimboeuf
2022-04-12 12:24 ` Lai Jiangshan
2022-04-27 8:26 ` Lai Jiangshan
2022-05-13 9:04 ` Lai Jiangshan
2022-05-18 18:44 ` [tip: x86/sev] x86/sev: Annotate stack change in the #VC handler tip-bot2 for Lai Jiangshan
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