linux-kernel - [PATCH V6 43/49] x86/doublefault: Use C entry code

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Message-Id: <20211126101209.8613-44-jiangshanlai@gmail.com>
Date:   Fri, 26 Nov 2021 18:12:03 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     x86@...nel.org, Lai Jiangshan <laijs@...ux.alibaba.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>, Juergen Gross <jgross@...e.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: [PATCH V6 43/49] x86/doublefault: Use C entry code

From: Lai Jiangshan <laijs@...ux.alibaba.com>

Use DEFINE_IDTENTRY_IST_ENTRY_ERRORCODE to emit C entry function and
use the function directly in entry_64.S.

Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 arch/x86/entry/entry_64.S       | 12 ++----------
 arch/x86/include/asm/idtentry.h |  1 +
 2 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index cc552e23d691..5a9738218722 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -574,16 +574,8 @@ SYM_CODE_START(\asmsym)
 	PUSH_AND_CLEAR_REGS
 	ENCODE_FRAME_POINTER
 
-	/* paranoid_entry returns GS information for paranoid_exit in EBX. */
-	call	paranoid_entry
-	UNWIND_HINT_REGS
-
-	movq	%rsp, %rdi		/* pt_regs pointer into first argument */
-	movq	ORIG_RAX(%rsp), %rsi	/* get error code into 2nd argument*/
-	movq	$-1, ORIG_RAX(%rsp)	/* no syscall to restart */
-	call	\cfunc
-
-	call	paranoid_exit
+	movq	%rsp, %rdi		/* pt_regs pointer */
+	call	ist_\cfunc
 	jmp	restore_regs_and_return_to_kernel
 
 _ASM_NOKPROBE(\asmsym)
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index 46b2ef021992..144f3a6d875a 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -415,6 +415,7 @@ __visible __entry_text void ist_##func(struct pt_regs *regs)		\
  * Maps to DEFINE_IDTENTRY_RAW_ERRORCODE
  */
 #define DEFINE_IDTENTRY_DF(func)					\
+	DEFINE_IDTENTRY_IST_ENTRY_ERRORCODE(func)			\
 	DEFINE_IDTENTRY_RAW_ERRORCODE(func)
 
 /**
-- 
2.19.1.6.gb485710b