From: Thomas Gleixner <tglx@linutronix.de>
Date: Thu, 15 Sep 2022 11:10:50 +0000 (+0200)
Subject: x86/paravirt: Properly align PV functions
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1d293758e548aa6ff65e4dd3f5a9bc2a34b38ce3;p=linux.git

x86/paravirt: Properly align PV functions

Ensure inline asm functions are consistently aligned with compiler
generated and SYM_FUNC_START*() functions.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20220915111144.038540008@infradead.org
---

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 2a0b8dd4ec335..1be66c15ecbd7 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -665,6 +665,7 @@ bool __raw_callee_save___native_vcpu_is_preempted(long cpu);
 	asm(".pushsection " section ", \"ax\";"				\
 	    ".globl " PV_THUNK_NAME(func) ";"				\
 	    ".type " PV_THUNK_NAME(func) ", @function;"			\
+	    ASM_FUNC_ALIGN						\
 	    PV_THUNK_NAME(func) ":"					\
 	    ASM_ENDBR							\
 	    FRAME_BEGIN							\
diff --git a/arch/x86/include/asm/qspinlock_paravirt.h b/arch/x86/include/asm/qspinlock_paravirt.h
index 60ece592b2207..082551b3c75ed 100644
--- a/arch/x86/include/asm/qspinlock_paravirt.h
+++ b/arch/x86/include/asm/qspinlock_paravirt.h
@@ -40,7 +40,7 @@ __PV_CALLEE_SAVE_REGS_THUNK(__pv_queued_spin_unlock_slowpath, ".spinlock.text");
 asm    (".pushsection .spinlock.text;"
 	".globl " PV_UNLOCK ";"
 	".type " PV_UNLOCK ", @function;"
-	".align 4,0x90;"
+	ASM_FUNC_ALIGN
 	PV_UNLOCK ": "
 	ASM_ENDBR
 	FRAME_BEGIN
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index d4e48b4a438b2..95fb85bea1118 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -802,6 +802,7 @@ asm(
 ".pushsection .text;"
 ".global __raw_callee_save___kvm_vcpu_is_preempted;"
 ".type __raw_callee_save___kvm_vcpu_is_preempted, @function;"
+ASM_FUNC_ALIGN
 "__raw_callee_save___kvm_vcpu_is_preempted:"
 ASM_ENDBR
 "movq	__per_cpu_offset(,%rdi,8), %rax;"
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 7ca2d46c08cc9..e244c49b52d7e 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -40,6 +40,7 @@
 extern void _paravirt_nop(void);
 asm (".pushsection .entry.text, \"ax\"\n"
      ".global _paravirt_nop\n"
+     ASM_FUNC_ALIGN
      "_paravirt_nop:\n\t"
      ASM_ENDBR
      ASM_RET
@@ -50,6 +51,7 @@ asm (".pushsection .entry.text, \"ax\"\n"
 /* stub always returning 0. */
 asm (".pushsection .entry.text, \"ax\"\n"
      ".global paravirt_ret0\n"
+     ASM_FUNC_ALIGN
      "paravirt_ret0:\n\t"
      ASM_ENDBR
      "xor %" _ASM_AX ", %" _ASM_AX ";\n\t"