linux-kernel - [PATCH] x86_64: Patch paravirt inline replacements when loading modules

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Date:	Sat, 28 Jun 2008 18:25:41 -0400 (EDT)
From:	Anders H Kaseorg <andersk@....EDU>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] x86_64: Patch paravirt inline replacements when loading
 modules

Paravirt replacements were added to the i386 module loader by commit
139ec7c416248b9ea227d21839235344edfee1e0.  This adds the same code to
the x86_64 module loader.

Signed-off-by: Anders Kaseorg <andersk@....edu>
---
  arch/x86/kernel/module_64.c |   10 +++++++++-
  1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/module_64.c b/arch/x86/kernel/module_64.c
index a888e67..0e86767 100644
--- a/arch/x86/kernel/module_64.c
+++ b/arch/x86/kernel/module_64.c
@@ -150,7 +150,8 @@ int module_finalize(const Elf_Ehdr *hdr,
                      const Elf_Shdr *sechdrs,
                      struct module *me)
  {
-	const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL;
+	const Elf_Shdr *s, *text = NULL, *alt = NULL, *locks = NULL,
+		*para = NULL;
  	char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;

  	for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
@@ -160,6 +161,8 @@ int module_finalize(const Elf_Ehdr *hdr,
  			alt = s;
  		if (!strcmp(".smp_locks", secstrings + s->sh_name))
  			locks= s;
+		if (!strcmp(".parainstructions", secstrings + s->sh_name))
+			para = s;
  	}

  	if (alt) {
@@ -175,6 +178,11 @@ int module_finalize(const Elf_Ehdr *hdr,
  					    tseg, tseg + text->sh_size);
  	}

+	if (para) {
+		void *pseg = (void *)para->sh_addr;
+		apply_paravirt(pseg, pseg + para->sh_size);
+	}
+
  	return module_bug_finalize(hdr, sechdrs, me);
  }

-- 
1.5.4.3

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