kexec: create a new config option CONFIG_KEXEC_FILE for new syscall

Currently new system call kexec_file_load() and all the associated code
compiles if CONFIG_KEXEC=y.  But new syscall also compiles purgatory
code which currently uses gcc option -mcmodel=large.  This option seems
to be available only gcc 4.4 onwards.

Hiding new functionality behind a new config option will not break
existing users of old gcc.  Those who wish to enable new functionality
will require new gcc.  Having said that, I am trying to figure out how
can I move away from using -mcmodel=large but that can take a while.

I think there are other advantages of introducing this new config
option.  As this option will be enabled only on x86_64, other arches
don't have to compile generic kexec code which will never be used.  This
new code selects CRYPTO=y and CRYPTO_SHA256=y.  And all other arches had
to do this for CONFIG_KEXEC.  Now with introduction of new config
option, we can remove crypto dependency from other arches.

Now CONFIG_KEXEC_FILE is available only on x86_64.  So whereever I had
CONFIG_X86_64 defined, I got rid of that.

For CONFIG_KEXEC_FILE, instead of doing select CRYPTO=y, I changed it to
"depends on CRYPTO=y".  This should be safer as "select" is not
recursive.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Tested-by: Shaun Ruffell <sruffell@digium.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/x86/Kbuild b/arch/x86/Kbuild
index 61b6d51..3942f74 100644 (file)
--- a/arch/x86/Kbuild
+++ b/arch/x86/Kbuild
@@ -17,6 +17,4 @@ obj-$(CONFIG_IA32_EMULATION) += ia32/
 obj-y += platform/
 obj-y += net/
 
-ifeq ($(CONFIG_X86_64),y)
-obj-$(CONFIG_KEXEC) += purgatory/
-endif
+obj-$(CONFIG_KEXEC_FILE) += purgatory/

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5d0bf1a..778178f 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1585,9 +1585,6 @@ source kernel/Kconfig.hz
 
 config KEXEC
        bool "kexec system call"
-       select BUILD_BIN2C
-       select CRYPTO
-       select CRYPTO_SHA256
        ---help---
          kexec is a system call that implements the ability to shutdown your
          current kernel, and to start another kernel.  It is like a reboot
@@ -1602,9 +1599,22 @@ config KEXEC
          interface is strongly in flux, so no good recommendation can be
          made.
 
+config KEXEC_FILE
+       bool "kexec file based system call"
+       select BUILD_BIN2C
+       depends on KEXEC
+       depends on X86_64
+       depends on CRYPTO=y
+       depends on CRYPTO_SHA256=y
+       ---help---
+         This is new version of kexec system call. This system call is
+         file based and takes file descriptors as system call argument
+         for kernel and initramfs as opposed to list of segments as
+         accepted by previous system call.
+
 config KEXEC_VERIFY_SIG
        bool "Verify kernel signature during kexec_file_load() syscall"
-       depends on KEXEC
+       depends on KEXEC_FILE
        ---help---
          This option makes kernel signature verification mandatory for
          kexec_file_load() syscall. If kernel is signature can not be

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index c1aa368..c96bcec 100644 (file)
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -184,11 +184,8 @@ archheaders:
        $(Q)$(MAKE) $(build)=arch/x86/syscalls all
 
 archprepare:
-ifeq ($(CONFIG_KEXEC),y)
-# Build only for 64bit. No loaders for 32bit yet.
- ifeq ($(CONFIG_X86_64),y)
+ifeq ($(CONFIG_KEXEC_FILE),y)
        $(Q)$(MAKE) $(build)=arch/x86/purgatory arch/x86/purgatory/kexec-purgatory.c
- endif
 endif
 
 ###

diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index b5ea75c..ada2e2d 100644 (file)
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_FTRACE_SYSCALLS) += ftrace.o
 obj-$(CONFIG_X86_TSC)          += trace_clock.o
 obj-$(CONFIG_KEXEC)            += machine_kexec_$(BITS).o
 obj-$(CONFIG_KEXEC)            += relocate_kernel_$(BITS).o crash.o
+obj-$(CONFIG_KEXEC_FILE)       += kexec-bzimage64.o
 obj-$(CONFIG_CRASH_DUMP)       += crash_dump_$(BITS).o
 obj-y                          += kprobes/
 obj-$(CONFIG_MODULES)          += module.o
@@ -118,5 +119,4 @@ ifeq ($(CONFIG_X86_64),y)
 
        obj-$(CONFIG_PCI_MMCONFIG)      += mmconf-fam10h_64.o
        obj-y                           += vsmp_64.o
-       obj-$(CONFIG_KEXEC)             += kexec-bzimage64.o
 endif

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index 0553a34..a618fcd 100644 (file)
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -182,8 +182,7 @@ void native_machine_crash_shutdown(struct pt_regs *regs)
        crash_save_cpu(regs, safe_smp_processor_id());
 }
 
-#ifdef CONFIG_X86_64
-
+#ifdef CONFIG_KEXEC_FILE
 static int get_nr_ram_ranges_callback(unsigned long start_pfn,
                                unsigned long nr_pfn, void *arg)
 {
@@ -696,5 +695,4 @@ int crash_load_segments(struct kimage *image)
 
        return ret;
 }
-
-#endif /* CONFIG_X86_64 */
+#endif /* CONFIG_KEXEC_FILE */

diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c
index 8b04018..4859810 100644 (file)
--- a/arch/x86/kernel/machine_kexec_64.c
+++ b/arch/x86/kernel/machine_kexec_64.c
@@ -25,9 +25,11 @@
 #include <asm/debugreg.h>
 #include <asm/kexec-bzimage64.h>
 
+#ifdef CONFIG_KEXEC_FILE
 static struct kexec_file_ops *kexec_file_loaders[] = {
                &kexec_bzImage64_ops,
 };
+#endif
 
 static void free_transition_pgtable(struct kimage *image)
 {
@@ -178,6 +180,7 @@ static void load_segments(void)
                );
 }
 
+#ifdef CONFIG_KEXEC_FILE
 /* Update purgatory as needed after various image segments have been prepared */
 static int arch_update_purgatory(struct kimage *image)
 {
@@ -209,6 +212,12 @@ static int arch_update_purgatory(struct kimage *image)
 
        return ret;
 }
+#else /* !CONFIG_KEXEC_FILE */
+static inline int arch_update_purgatory(struct kimage *image)
+{
+       return 0;
+}
+#endif /* CONFIG_KEXEC_FILE */
 
 int machine_kexec_prepare(struct kimage *image)
 {
@@ -329,6 +338,7 @@ void arch_crash_save_vmcoreinfo(void)
 
 /* arch-dependent functionality related to kexec file-based syscall */
 
+#ifdef CONFIG_KEXEC_FILE
 int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
                                  unsigned long buf_len)
 {
@@ -522,3 +532,4 @@ overflow:
               (int)ELF64_R_TYPE(rel[i].r_info), value);
        return -ENOEXEC;
 }
+#endif /* CONFIG_KEXEC_FILE */

diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
index 7fde9ee..c4ae06e 100644 (file)
--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -24,7 +24,4 @@ $(obj)/kexec-purgatory.c: $(obj)/purgatory.ro FORCE
        $(call if_changed,bin2c)
 
 
-# No loaders for 32bits yet.
-ifeq ($(CONFIG_X86_64),y)
- obj-$(CONFIG_KEXEC)           += kexec-purgatory.o
-endif
+obj-$(CONFIG_KEXEC_FILE)       += kexec-purgatory.o

diff --git a/kernel/kexec.c b/kernel/kexec.c
index 0b49a0a..2bee072 100644 (file)
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -64,7 +64,9 @@ bool kexec_in_progress = false;
 char __weak kexec_purgatory[0];
 size_t __weak kexec_purgatory_size = 0;
 
+#ifdef CONFIG_KEXEC_FILE
 static int kexec_calculate_store_digests(struct kimage *image);
+#endif
 
 /* Location of the reserved area for the crash kernel */
 struct resource crashk_res = {
@@ -341,6 +343,7 @@ out_free_image:
        return ret;
 }
 
+#ifdef CONFIG_KEXEC_FILE
 static int copy_file_from_fd(int fd, void **buf, unsigned long *buf_len)
 {
        struct fd f = fdget(fd);
@@ -612,6 +615,9 @@ out_free_image:
        kfree(image);
        return ret;
 }
+#else /* CONFIG_KEXEC_FILE */
+static inline void kimage_file_post_load_cleanup(struct kimage *image) { }
+#endif /* CONFIG_KEXEC_FILE */
 
 static int kimage_is_destination_range(struct kimage *image,
                                        unsigned long start,
@@ -1375,6 +1381,7 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry,
 }
 #endif
 
+#ifdef CONFIG_KEXEC_FILE
 SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
                unsigned long, cmdline_len, const char __user *, cmdline_ptr,
                unsigned long, flags)
@@ -1451,6 +1458,8 @@ out:
        return ret;
 }
 
+#endif /* CONFIG_KEXEC_FILE */
+
 void crash_kexec(struct pt_regs *regs)
 {
        /* Take the kexec_mutex here to prevent sys_kexec_load
@@ -2006,6 +2015,7 @@ static int __init crash_save_vmcoreinfo_init(void)
 
 subsys_initcall(crash_save_vmcoreinfo_init);
 
+#ifdef CONFIG_KEXEC_FILE
 static int __kexec_add_segment(struct kimage *image, char *buf,
                               unsigned long bufsz, unsigned long mem,
                               unsigned long memsz)
@@ -2682,6 +2692,7 @@ int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
 
        return 0;
 }
+#endif /* CONFIG_KEXEC_FILE */
 
 /*
  * Move into place and start executing a preloaded standalone