Re: [PATCH 13/15] move patching code to arch-specific file.

On Dec 20, 2007 6:33 PM, Ingo Molnar <mingo@xxxxxxx> wrote:

* Ingo Molnar <mingo@xxxxxxx> wrote:

this patch adds the paravirt_patch_32.o:

-obj-$(CONFIG_PARAVIRT) += paravirt.o
+obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_32.o

but does not add that file nor any other rule to build that target, so
it fails to build with the attached config:

make[1]: *** No rule to make target
`arch/x86/kernel/paravirt_patch_32.o', needed by
`arch/x86/kernel/built-in.o'. Stop.

if it's just that single missing file then please send me a patch that
adds that file and i'll add it to this patch. (instead of resending the
whole series)

Yeah, I must have forgotten to git-add it.
It was building here fine, because I clearly have the file locally ;-)

I'm attaching a new patch that replaces just this one.

--
Glauber de Oliveira Costa.
"Free as in Freedom"
http://glommer.net

"The less confident you are, the more serious you have to act."
From 9a9307e976391776c0d63e3640d90738e20e9ee9 Mon Sep 17 00:00:00 2001
From: Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>
Date: Tue, 18 Dec 2007 16:47:35 -0200
Subject: [PATCH] [PATCH] move patching code to arch-specific file.

The core patching code for paravirt is sufficiently different
among i386 and x86_64, and we move them to specific files.

Signed-off-by: Glauber de Oliveira Costa <gcosta@xxxxxxxxxx>
---
arch/x86/kernel/Makefile_32 | 2 +-
arch/x86/kernel/paravirt.c | 50 -----------------------------------
arch/x86/kernel/paravirt_patch_32.c | 49 ++++++++++++++++++++++++++++++++++
include/asm-x86/paravirt.h | 8 +++++
4 files changed, 58 insertions(+), 51 deletions(-)
create mode 100644 arch/x86/kernel/paravirt_patch_32.c

diff --git a/arch/x86/kernel/Makefile_32 b/arch/x86/kernel/Makefile_32
index cfb71a5..86c6327 100644
--- a/arch/x86/kernel/Makefile_32
+++ b/arch/x86/kernel/Makefile_32
@@ -48,7 +48,7 @@ obj-$(CONFIG_K8_NB) += k8.o
obj-$(CONFIG_MGEODE_LX) += geode_32.o mfgpt_32.o

obj-$(CONFIG_VMI) += vmi_32.o vmiclock_32.o
-obj-$(CONFIG_PARAVIRT) += paravirt.o
+obj-$(CONFIG_PARAVIRT) += paravirt.o paravirt_patch_32.o
obj-y += pcspeaker.o

obj-$(CONFIG_SCx200) += scx200_32.o
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index e7c17cc..864be04 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -58,59 +58,9 @@ char *memory_setup(void)
extern const char start_##ops##_##name[], end_##ops##_##name[]; \
asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")

-DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
-DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
-DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
-DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
-DEF_NATIVE(pv_cpu_ops, iret, "iret");
-DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "sti; sysexit");
-DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
-DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
-DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
-DEF_NATIVE(pv_cpu_ops, clts, "clts");
-DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
-
/* Undefined instruction for dealing with missing ops pointers. */
static const unsigned char ud2a[] = { 0x0f, 0x0b };

-static unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
- unsigned long addr, unsigned len)
-{
- const unsigned char *start, *end;
- unsigned ret;
-
- switch(type) {
-#define SITE(ops, x) \
- case PARAVIRT_PATCH(ops.x): \
- start = start_##ops##_##x; \
- end = end_##ops##_##x; \
- goto patch_site
-
- SITE(pv_irq_ops, irq_disable);
- SITE(pv_irq_ops, irq_enable);
- SITE(pv_irq_ops, restore_fl);
- SITE(pv_irq_ops, save_fl);
- SITE(pv_cpu_ops, iret);
- SITE(pv_cpu_ops, irq_enable_syscall_ret);
- SITE(pv_mmu_ops, read_cr2);
- SITE(pv_mmu_ops, read_cr3);
- SITE(pv_mmu_ops, write_cr3);
- SITE(pv_cpu_ops, clts);
- SITE(pv_cpu_ops, read_tsc);
-#undef SITE
-
- patch_site:
- ret = paravirt_patch_insns(ibuf, len, start, end);
- break;
-
- default:
- ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
- break;
- }
-
- return ret;
-}
-
unsigned paravirt_patch_nop(void)
{
return 0;
diff --git a/arch/x86/kernel/paravirt_patch_32.c b/arch/x86/kernel/paravirt_patch_32.c
new file mode 100644
index 0000000..82fc5fc
--- /dev/null
+++ b/arch/x86/kernel/paravirt_patch_32.c
@@ -0,0 +1,49 @@
+#include <asm/paravirt.h>
+
+DEF_NATIVE(pv_irq_ops, irq_disable, "cli");
+DEF_NATIVE(pv_irq_ops, irq_enable, "sti");
+DEF_NATIVE(pv_irq_ops, restore_fl, "push %eax; popf");
+DEF_NATIVE(pv_irq_ops, save_fl, "pushf; pop %eax");
+DEF_NATIVE(pv_cpu_ops, iret, "iret");
+DEF_NATIVE(pv_cpu_ops, irq_enable_syscall_ret, "sti; sysexit");
+DEF_NATIVE(pv_mmu_ops, read_cr2, "mov %cr2, %eax");
+DEF_NATIVE(pv_mmu_ops, write_cr3, "mov %eax, %cr3");
+DEF_NATIVE(pv_mmu_ops, read_cr3, "mov %cr3, %eax");
+DEF_NATIVE(pv_cpu_ops, clts, "clts");
+DEF_NATIVE(pv_cpu_ops, read_tsc, "rdtsc");
+
+unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
+ unsigned long addr, unsigned len)
+{
+ const unsigned char *start, *end;
+ unsigned ret;
+
+#define PATCH_SITE(ops, x) \
+ case PARAVIRT_PATCH(ops.x): \
+ start = start_##ops##_##x; \
+ end = end_##ops##_##x; \
+ goto patch_site
+ switch(type) {
+ PATCH_SITE(pv_irq_ops, irq_disable);
+ PATCH_SITE(pv_irq_ops, irq_enable);
+ PATCH_SITE(pv_irq_ops, restore_fl);
+ PATCH_SITE(pv_irq_ops, save_fl);
+ PATCH_SITE(pv_cpu_ops, iret);
+ PATCH_SITE(pv_cpu_ops, irq_enable_syscall_ret);
+ PATCH_SITE(pv_mmu_ops, read_cr2);
+ PATCH_SITE(pv_mmu_ops, read_cr3);
+ PATCH_SITE(pv_mmu_ops, write_cr3);
+ PATCH_SITE(pv_cpu_ops, clts);
+ PATCH_SITE(pv_cpu_ops, read_tsc);
+
+ patch_site:
+ ret = paravirt_patch_insns(ibuf, len, start, end);
+ break;
+
+ default:
+ ret = paravirt_patch_default(type, clobbers, ibuf, addr, len);
+ break;
+ }
+#undef PATCH_SITE
+ return ret;
+}
diff --git a/include/asm-x86/paravirt.h b/include/asm-x86/paravirt.h
index 96d9d3f..3b747d0 100644
--- a/include/asm-x86/paravirt.h
+++ b/include/asm-x86/paravirt.h
@@ -308,6 +308,11 @@ extern struct pv_mmu_ops pv_mmu_ops;
#define paravirt_alt(insn_string) \
_paravirt_alt(insn_string, "%c[paravirt_typenum]", "%c[paravirt_clobber]")

+/* Simple instruction patching code. */
+#define DEF_NATIVE(ops, name, code) \
+ extern const char start_##ops##_##name[], end_##ops##_##name[]; \
+ asm("start_" #ops "_" #name ": " code "; end_" #ops "_" #name ":")
+
unsigned paravirt_patch_nop(void);
unsigned paravirt_patch_ignore(unsigned len);
unsigned paravirt_patch_call(void *insnbuf,
@@ -322,6 +327,9 @@ unsigned paravirt_patch_default(u8 type, u16 clobbers, void *insnbuf,
unsigned paravirt_patch_insns(void *insnbuf, unsigned len,
const char *start, const char *end);

+unsigned native_patch(u8 type, u16 clobbers, void *ibuf,
+ unsigned long addr, unsigned len);
+
int paravirt_disable_iospace(void);

/*
--
1.5.0.6

Relevant Pages

  • O_CANLINK and flink
    ... This is a refresh of a patch I've sent quite some time ago. ... That old patch introduced a flink() syscall without proper security ... The file associated with fd is linked with the newname. ... +asmlinkage long sys_link(const char *oldname, ...
    (Linux-Kernel)
  • [PATCH] I2C: Fix a common race condition in hardware monitoring
    ... This big patch ... static ssize_t show_sensor(struct device *dev, char *buf, int nr) ... static void set_in_max(struct device *dev, const char *buf, int nr) ...
    (Linux-Kernel)
  • Re: [PATCH] exporting capability code/name pairs (try #6.1)
    ... This patch add a private data field, declared as void *, within kobj_attribute ... It enables to share a single method function with several similar entries, ... const char *buf, size_t count); ...
    (Linux-Kernel)
  • Re: Bug in #! processing - One More Time
    ... Attached please find patch which rips any special processing of command ... interpreter name plus length of all arguments exceeded MAXSHELLCMDLEN. ... +find_token_end(const char *bcp, const char *ecp) ... +find_whitespace_end(const char *bcp, const char *ecp) ...
    (freebsd-arch)
  • Re: [PATCH] modpost: detect unterminated device id lists
    ... This patch against 2.6.23-rc6 will cause modpost to fail if any device ... Elf_Sym *sym, const char *symname) ...
    (Linux-Kernel)