[Xen-ia64-devel] [PATCH 3/5] ia64/pv_ops/bp/module: support binary patching for kernel module.

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

support binary patching for kernel module.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 arch/ia64/include/asm/module.h |    6 ++++++
 arch/ia64/kernel/module.c      |   32 ++++++++++++++++++++++++++++++++
 2 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/arch/ia64/include/asm/module.h b/arch/ia64/include/asm/module.h
index d2da61e..908eaef 100644
--- a/arch/ia64/include/asm/module.h
+++ b/arch/ia64/include/asm/module.h
@@ -16,6 +16,12 @@ struct mod_arch_specific {
        struct elf64_shdr *got;         /* global offset table */
        struct elf64_shdr *opd;         /* official procedure descriptors */
        struct elf64_shdr *unwind;      /* unwind-table section */
+#ifdef CONFIG_PARAVIRT
+       struct elf64_shdr *paravirt_bundles;
+                                       /* paravirt_alt_bundle_patch table */
+       struct elf64_shdr *paravirt_insts;
+                                       /* paravirt_alt_inst_patch table */
+#endif
        unsigned long gp;               /* global-pointer for module */
 
        void *core_unw_table;           /* core unwind-table cookie returned by 
unwinder */
diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c
index aaa7d90..34fe425 100644
--- a/arch/ia64/kernel/module.c
+++ b/arch/ia64/kernel/module.c
@@ -446,6 +446,14 @@ module_frob_arch_sections (Elf_Ehdr *ehdr, Elf_Shdr 
*sechdrs, char *secstrings,
                        mod->arch.opd = s;
                else if (strcmp(".IA_64.unwind", secstrings + s->sh_name) == 0)
                        mod->arch.unwind = s;
+#ifdef CONFIG_PARAVIRT
+               else if (strcmp(".paravirt_bundles",
+                               secstrings + s->sh_name) == 0)
+                       mod->arch.paravirt_bundles = s;
+               else if (strcmp(".paravirt_insts",
+                               secstrings + s->sh_name) == 0)
+                       mod->arch.paravirt_insts = s;
+#endif
 
        if (!mod->arch.core_plt || !mod->arch.init_plt || !mod->arch.got || 
!mod->arch.opd) {
                printk(KERN_ERR "%s: sections missing\n", mod->name);
@@ -921,6 +929,30 @@ module_finalize (const Elf_Ehdr *hdr, const Elf_Shdr 
*sechdrs, struct module *mo
        DEBUGP("%s: init: entry=%p\n", __func__, mod->init);
        if (mod->arch.unwind)
                register_unwind_table(mod);
+#ifdef CONFIG_PARAVIRT
+        if (mod->arch.paravirt_bundles) {
+                struct paravirt_patch_site_bundle *start =
+                        (struct paravirt_patch_site_bundle *)
+                        mod->arch.paravirt_bundles->sh_addr;
+                struct paravirt_patch_site_bundle *end =
+                        (struct paravirt_patch_site_bundle *)
+                        (mod->arch.paravirt_bundles->sh_addr +
+                         mod->arch.paravirt_bundles->sh_size);
+
+                paravirt_patch_apply_bundle(start, end);
+        }
+        if (mod->arch.paravirt_insts) {
+                struct paravirt_patch_site_inst *start =
+                        (struct paravirt_patch_site_inst *)
+                        mod->arch.paravirt_insts->sh_addr;
+                struct paravirt_patch_site_inst *end =
+                        (struct paravirt_patch_site_inst *)
+                        (mod->arch.paravirt_insts->sh_addr +
+                         mod->arch.paravirt_insts->sh_size);
+
+                paravirt_patch_apply_inst(start, end);
+        }
+#endif
        return 0;
 }
 
-- 
1.6.0.2


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