linux-kernel - [patch 22/38] x86/paravirt: Make struct paravirt_call

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Date:   Sun, 17 Jul 2022 01:17:45 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Linus Torvalds <torvalds@...ux-foundation.org>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        Johannes Wikner <kwikner@...z.ch>,
        Alyssa Milburn <alyssa.milburn@...ux.intel.com>,
        Jann Horn <jannh@...gle.com>, "H.J. Lu" <hjl.tools@...il.com>,
        Joao Moreira <joao.moreira@...el.com>,
        Joseph Nuzman <joseph.nuzman@...el.com>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [patch 22/38] x86/paravirt: Make struct paravirt_call_site
 unconditionally available

For the upcoming call thunk patching it's less ifdeffery when the data
structure is unconditionally available. The code can then be trivially
fenced off with IS_ENABLED().

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/include/asm/paravirt.h       |    4 ++--
 arch/x86/include/asm/paravirt_types.h |   20 ++++++++++++--------
 2 files changed, 14 insertions(+), 10 deletions(-)

--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -4,13 +4,13 @@
 /* Various instructions on x86 need to be replaced for
  * para-virtualization: those hooks are defined here. */
 
+#include <asm/paravirt_types.h>
+
 #ifdef CONFIG_PARAVIRT
 #include <asm/pgtable_types.h>
 #include <asm/asm.h>
 #include <asm/nospec-branch.h>
 
-#include <asm/paravirt_types.h>
-
 #ifndef __ASSEMBLY__
 #include <linux/bug.h>
 #include <linux/types.h>
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -2,6 +2,17 @@
 #ifndef _ASM_X86_PARAVIRT_TYPES_H
 #define _ASM_X86_PARAVIRT_TYPES_H
 
+#ifndef __ASSEMBLY__
+/* These all sit in the .parainstructions section to tell us what to patch. */
+struct paravirt_patch_site {
+	u8 *instr;		/* original instructions */
+	u8 type;		/* type of this instruction */
+	u8 len;			/* length of original instruction */
+};
+#endif
+
+#ifdef CONFIG_PARAVIRT
+
 /* Bitmask of what can be clobbered: usually at least eax. */
 #define CLBR_EAX  (1 << 0)
 #define CLBR_ECX  (1 << 1)
@@ -584,16 +595,9 @@ unsigned long paravirt_ret0(void);
 
 #define paravirt_nop	((void *)_paravirt_nop)
 
-/* These all sit in the .parainstructions section to tell us what to patch. */
-struct paravirt_patch_site {
-	u8 *instr;		/* original instructions */
-	u8 type;		/* type of this instruction */
-	u8 len;			/* length of original instruction */
-};
-
 extern struct paravirt_patch_site __parainstructions[],
 	__parainstructions_end[];
 
 #endif	/* __ASSEMBLY__ */
-
+#endif  /* CONFIG_PARAVIRT */
 #endif	/* _ASM_X86_PARAVIRT_TYPES_H */