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kexec: split kexec_load syscall from kexec core code

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There are two kexec load syscalls, kexec_load another and kexec_file_load.
 kexec_file_load has been splited as kernel/kexec_file.c.  In this patch I
split kexec_load syscall code to kernel/kexec.c.

And add a new kconfig option KEXEC_CORE, so we can disable kexec_load and
use kexec_file_load only, or vice verse.

The original requirement is from Ted Ts'o, he want kexec kernel signature
being checked with CONFIG_KEXEC_VERIFY_SIG enabled.  But kexec-tools use
kexec_load syscall can bypass the checking.

Vivek Goyal proposed to create a common kconfig option so user can compile
in only one syscall for loading kexec kernel.  KEXEC/KEXEC_FILE selects
KEXEC_CORE so that old config files still work.

Because there's general code need CONFIG_KEXEC_CORE, so I updated all the
architecture Kconfig with a new option KEXEC_CORE, and let KEXEC selects
KEXEC_CORE in arch Kconfig.  Also updated general kernel code with to
kexec_load syscall.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Dave Young <dyoung@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Petr Tesarik <ptesarik@suse.cz>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Josh Boyer <jwboyer@fedoraproject.org>
Cc: David Howells <dhowells@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Young 2015-09-09 15:38:55 -07:00 committed by Linus Torvalds
parent a43cac0d9d
commit 2965faa5e0
32 changed files with 1560 additions and 1527 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
arch/Kconfig
View file

@ -2,6 +2,9 @@
# General architecture dependent options
#
config KEXEC_CORE
bool
config OPROFILE
tristate "OProfile system profiling"
depends on PROFILING

1
arch/arm/Kconfig
View file

@ -2020,6 +2020,7 @@ config KEXEC
bool "Kexec system call (EXPERIMENTAL)"
depends on (!SMP || PM_SLEEP_SMP)
depends on !CPU_V7M
select KEXEC_CORE
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

1
arch/ia64/Kconfig
View file

@ -518,6 +518,7 @@ source "drivers/sn/Kconfig"
config KEXEC
bool "kexec system call"
depends on !IA64_HP_SIM && (!SMP || HOTPLUG_CPU)
select KEXEC_CORE
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

1
arch/m68k/Kconfig
View file

@ -95,6 +95,7 @@ config MMU_SUN3
config KEXEC
bool "kexec system call"
depends on M68KCLASSIC
select KEXEC_CORE
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

1
arch/mips/Kconfig
View file

@ -2597,6 +2597,7 @@ source "kernel/Kconfig.preempt"
config KEXEC
bool "Kexec system call"
select KEXEC_CORE
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

1
arch/powerpc/Kconfig
View file

@ -420,6 +420,7 @@ config PPC64_SUPPORTS_MEMORY_FAILURE
config KEXEC
bool "kexec system call"
depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP))
select KEXEC_CORE
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

1
arch/s390/Kconfig
View file

@ -48,6 +48,7 @@ config ARCH_SUPPORTS_DEBUG_PAGEALLOC
config KEXEC
def_bool y
select KEXEC_CORE
config AUDIT_ARCH
def_bool y

1
arch/sh/Kconfig
View file

@ -602,6 +602,7 @@ source kernel/Kconfig.hz
config KEXEC
bool "kexec system call (EXPERIMENTAL)"
depends on SUPERH32 && MMU
select KEXEC_CORE
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

1
arch/tile/Kconfig
View file

@ -205,6 +205,7 @@ source "kernel/Kconfig.hz"
config KEXEC
bool "kexec system call"
select KEXEC_CORE
---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

3
arch/x86/Kconfig
View file

@ -1754,6 +1754,7 @@ source kernel/Kconfig.hz
config KEXEC
bool "kexec system call"
select KEXEC_CORE
---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
@ -1770,8 +1771,8 @@ config KEXEC
config KEXEC_FILE
bool "kexec file based system call"
select KEXEC_CORE
select BUILD_BIN2C
depends on KEXEC
depends on X86_64
depends on CRYPTO=y
depends on CRYPTO_SHA256=y

2
arch/x86/boot/header.S
View file

@ -414,7 +414,7 @@ xloadflags:
# define XLF23 0
#endif
#if defined(CONFIG_X86_64) && defined(CONFIG_EFI) && defined(CONFIG_KEXEC)
#if defined(CONFIG_X86_64) && defined(CONFIG_EFI) && defined(CONFIG_KEXEC_CORE)
# define XLF4 XLF_EFI_KEXEC
#else
# define XLF4 0

2
arch/x86/include/asm/kdebug.h
View file

@ -29,7 +29,7 @@ extern void show_trace(struct task_struct *t, struct pt_regs *regs,
extern void __show_regs(struct pt_regs *regs, int all);
extern unsigned long oops_begin(void);
extern void oops_end(unsigned long, struct pt_regs *, int signr);
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
extern int in_crash_kexec;
#else
/* no crash dump is ever in progress if no crash kernel can be kexec'd */

4
arch/x86/kernel/Makefile
View file

@ -71,8 +71,8 @@ obj-$(CONFIG_LIVEPATCH) += livepatch.o
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += ftrace.o
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-$(CONFIG_KEXEC_CORE) += machine_kexec_$(BITS).o
obj-$(CONFIG_KEXEC_CORE) += relocate_kernel_$(BITS).o crash.o
obj-$(CONFIG_KEXEC_FILE) += kexec-bzimage64.o
obj-$(CONFIG_CRASH_DUMP) += crash_dump_$(BITS).o
obj-y += kprobes/

4
arch/x86/kernel/kvmclock.c
View file

@ -200,7 +200,7 @@ static void kvm_setup_secondary_clock(void)
* kind of shutdown from our side, we unregister the clock by writting anything
* that does not have the 'enable' bit set in the msr
*/
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
static void kvm_crash_shutdown(struct pt_regs *regs)
{
native_write_msr(msr_kvm_system_time, 0, 0);
@ -259,7 +259,7 @@ void __init kvmclock_init(void)
x86_platform.save_sched_clock_state = kvm_save_sched_clock_state;
x86_platform.restore_sched_clock_state = kvm_restore_sched_clock_state;
machine_ops.shutdown = kvm_shutdown;
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
machine_ops.crash_shutdown = kvm_crash_shutdown;
#endif
kvm_get_preset_lpj();

4
arch/x86/kernel/reboot.c
View file

@ -673,7 +673,7 @@ struct machine_ops machine_ops = {
.emergency_restart = native_machine_emergency_restart,
.restart = native_machine_restart,
.halt = native_machine_halt,
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
.crash_shutdown = native_machine_crash_shutdown,
#endif
};
@ -703,7 +703,7 @@ void machine_halt(void)
machine_ops.halt();
}
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
void machine_crash_shutdown(struct pt_regs *regs)
{
machine_ops.crash_shutdown(regs);

2
arch/x86/kernel/setup.c
View file

@ -478,7 +478,7 @@ static void __init memblock_x86_reserve_range_setup_data(void)
* --------- Crashkernel reservation ------------------------------
*/
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
/*
* Keep the crash kernel below this limit. On 32 bits earlier kernels

2
arch/x86/kernel/vmlinux.lds.S
View file

@ -364,7 +364,7 @@ INIT_PER_CPU(irq_stack_union);
#endif /* CONFIG_X86_32 */
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
#include <asm/kexec.h>
. = ASSERT(kexec_control_code_size <= KEXEC_CONTROL_CODE_MAX_SIZE,

8
arch/x86/kvm/vmx.c
View file

@ -1264,7 +1264,7 @@ static void vmcs_load(struct vmcs *vmcs)
vmcs, phys_addr);
}
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
/*
* This bitmap is used to indicate whether the vmclear
* operation is enabled on all cpus. All disabled by
@ -1302,7 +1302,7 @@ static void crash_vmclear_local_loaded_vmcss(void)
#else
static inline void crash_enable_local_vmclear(int cpu) { }
static inline void crash_disable_local_vmclear(int cpu) { }
#endif /* CONFIG_KEXEC */
#endif /* CONFIG_KEXEC_CORE */
static void __loaded_vmcs_clear(void *arg)
{
@ -10411,7 +10411,7 @@ static int __init vmx_init(void)
if (r)
return r;
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
rcu_assign_pointer(crash_vmclear_loaded_vmcss,
crash_vmclear_local_loaded_vmcss);
#endif
@ -10421,7 +10421,7 @@ static int __init vmx_init(void)
static void __exit vmx_exit(void)
{
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
RCU_INIT_POINTER(crash_vmclear_loaded_vmcss, NULL);
synchronize_rcu();
#endif

4
arch/x86/platform/efi/efi.c
View file

@ -650,7 +650,7 @@ static void __init get_systab_virt_addr(efi_memory_desc_t *md)
static void __init save_runtime_map(void)
{
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
efi_memory_desc_t *md;
void *tmp, *p, *q = NULL;
int count = 0;
@ -748,7 +748,7 @@ static void * __init efi_map_regions(int *count, int *pg_shift)
static void __init kexec_enter_virtual_mode(void)
{
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
efi_memory_desc_t *md;
void *p;

6
arch/x86/platform/uv/uv_nmi.c
View file

@ -492,7 +492,7 @@ static void uv_nmi_touch_watchdogs(void)
touch_nmi_watchdog();
}
#if defined(CONFIG_KEXEC)
#if defined(CONFIG_KEXEC_CORE)
static atomic_t uv_nmi_kexec_failed;
static void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
{
@ -519,13 +519,13 @@ static void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
uv_nmi_sync_exit(0);
}
#else /* !CONFIG_KEXEC */
#else /* !CONFIG_KEXEC_CORE */
static inline void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
{
if (master)
pr_err("UV: NMI kdump: KEXEC not supported in this kernel\n");
}
#endif /* !CONFIG_KEXEC */
#endif /* !CONFIG_KEXEC_CORE */
#ifdef CONFIG_KGDB
#ifdef CONFIG_KGDB_KDB

2
drivers/firmware/efi/Kconfig
View file

@ -43,7 +43,7 @@ config EFI_VARS_PSTORE_DEFAULT_DISABLE
config EFI_RUNTIME_MAP
bool "Export efi runtime maps to sysfs"
depends on X86 && EFI && KEXEC
depends on X86 && EFI && KEXEC_CORE
default y
help
Export efi runtime memory maps to /sys/firmware/efi/runtime-map.

2
drivers/pci/pci-driver.c
View file

@ -467,7 +467,7 @@ static void pci_device_shutdown(struct device *dev)
pci_msi_shutdown(pci_dev);
pci_msix_shutdown(pci_dev);
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
/*
* If this is a kexec reboot, turn off Bus Master bit on the
* device to tell it to not continue to do DMA. Don't touch

6
include/linux/kexec.h
View file

@ -16,7 +16,7 @@
#include <uapi/linux/kexec.h>
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
#include <linux/list.h>
#include <linux/linkage.h>
#include <linux/compat.h>
@ -329,13 +329,13 @@ int __weak arch_kexec_apply_relocations_add(const Elf_Ehdr *ehdr,
int __weak arch_kexec_apply_relocations(const Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
unsigned int relsec);
#else /* !CONFIG_KEXEC */
#else /* !CONFIG_KEXEC_CORE */
struct pt_regs;
struct task_struct;
static inline void crash_kexec(struct pt_regs *regs) { }
static inline int kexec_should_crash(struct task_struct *p) { return 0; }
#define kexec_in_progress false
#endif /* CONFIG_KEXEC */
#endif /* CONFIG_KEXEC_CORE */
#endif /* !defined(__ASSEBMLY__) */

4
init/initramfs.c
View file

@ -526,14 +526,14 @@ extern unsigned long __initramfs_size;
static void __init free_initrd(void)
{
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
unsigned long crashk_end = (unsigned long)__va(crashk_res.end);
#endif
if (do_retain_initrd)
goto skip;
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
/*
* If the initrd region is overlapped with crashkernel reserved region,
* free only memory that is not part of crashkernel region.

1
kernel/Makefile
View file

@ -49,6 +49,7 @@ obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_MODULE_SIG) += module_signing.o
obj-$(CONFIG_KALLSYMS) += kallsyms.o
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
obj-$(CONFIG_KEXEC_CORE) += kexec_core.o
obj-$(CONFIG_KEXEC) += kexec.o
obj-$(CONFIG_KEXEC_FILE) += kexec_file.o
obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o

2
kernel/events/core.c
View file

@ -9094,7 +9094,7 @@ static void perf_event_init_cpu(int cpu)
mutex_unlock(&swhash->hlist_mutex);
}
#if defined CONFIG_HOTPLUG_CPU || defined CONFIG_KEXEC
#if defined CONFIG_HOTPLUG_CPU || defined CONFIG_KEXEC_CORE
static void __perf_event_exit_context(void *__info)
{
struct remove_event re = { .detach_group = true };

1495
kernel/kexec.c
View file

File diff suppressed because it is too large Load diff

1511
kernel/kexec_core.c Normal file
View file

File diff suppressed because it is too large Load diff

6
kernel/ksysfs.c
View file

@ -90,7 +90,7 @@ static ssize_t profiling_store(struct kobject *kobj,
KERNEL_ATTR_RW(profiling);
#endif
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
static ssize_t kexec_loaded_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
@ -134,7 +134,7 @@ static ssize_t vmcoreinfo_show(struct kobject *kobj,
}
KERNEL_ATTR_RO(vmcoreinfo);
#endif /* CONFIG_KEXEC */
#endif /* CONFIG_KEXEC_CORE */
/* whether file capabilities are enabled */
static ssize_t fscaps_show(struct kobject *kobj,
@ -196,7 +196,7 @@ static struct attribute * kernel_attrs[] = {
#ifdef CONFIG_PROFILING
&profiling_attr.attr,
#endif
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
&kexec_loaded_attr.attr,
&kexec_crash_loaded_attr.attr,
&kexec_crash_size_attr.attr,

2
kernel/printk/printk.c
View file

@ -835,7 +835,7 @@ const struct file_operations kmsg_fops = {
.release = devkmsg_release,
};
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
/*
* This appends the listed symbols to /proc/vmcore
*

2
kernel/reboot.c
View file

@ -346,7 +346,7 @@ SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
kernel_restart(buffer);
break;
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
case LINUX_REBOOT_CMD_KEXEC:
ret = kernel_kexec();
break;

2
kernel/sysctl.c
View file

@ -621,7 +621,7 @@ static struct ctl_table kern_table[] = {
.proc_handler = proc_dointvec,
},
#endif
#ifdef CONFIG_KEXEC
#ifdef CONFIG_KEXEC_CORE
{
.procname = "kexec_load_disabled",
.data = &kexec_load_disabled,