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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xm reboot/shutdown/sysrq to HVM domain
Hi, Sorry, the previous patch had a problem on dom0 boot. I have modified the patch to fix it and tested xm reboot/shutdown/sysrq to both of PV and HVM domain. To make reboot on HVM domain work correctly, the following patch is needed: http://lists.xensource.com/archives/html/xen-devel/2006-10/msg01184.html Regards, Tetsu Yamamoto Signed-off-by: Tetsu Yamamoto <yamamoto.tetsu@xxxxxxxxxxxxxx> Tetsu Yamamoto wrote: > Hi Steven, > > Thank you for your comments. > > The attached is modified patch based on your comments. > > The functions which can not be used from the module on HVM domain are > moved to the new file machine_reboot.c, and several #ifdefs are removed. > However, reboot.c still has two parts of #ifdef CONFIG_XEN because some > functions called in common functions are not EXPORT_SYMBOL: > - sys_reboot > - Some functions called in __do_suspend > > Regards, > > Tetsu Yamamoto > > Signed-off-by: Tetsu Yamamoto <yamamoto.tetsu@xxxxxxxxxxxxxx> > > Steven Smith wrote: >>>>> This patch enhances 'xm reboot'/'xm shutdown' commands to >>>>> reboot/shutdown guest Linux on HVM domain as gracefully as para-Linux. >>>>> In addtion, sysrq key signal can be sent to HVM domain by 'xm sysrq' >>>>> command. >>>> Thanks, that's really useful. I have a couple of comments about the >>>> patch, though: >>>> >>>> -- It looks like you had some problems with ctrl_alt_del(), and instead >>>> used kill_proc(cad_pid, SIGINT, 1). What was the reason for this? >>> The symbol ctrl_alt_del() can't be found when it is used in loadable >>> module. On build, the warning message is shown that ctrl_alt_del() is >>> undefined, and on loading, the error message is shown that it is unknown >>> symbol. I'm not sure why this happens, but I tried kill_proc(), which >>> is called in ctrl_alt_del(), it works correctly. >> Ah, okay, ctrl_alt_del isn't an EXPORT_SYMBOL. That's unfortunate, >> and this looks like a sensible work-around. >> >>>> -- You've introduced a lot of #ifdefs into reboot.c. It might be >>>> easier to just split the file in two; did you look at this at all? >>> reboot.c has common process to deal with reboot/shutdown/sysrq for >>> para-linux (built in kernel) and full-linux (loadable module), so I >>> think that it would be better to be one file in consideration of code >>> maintenance. >> I'm not talking about duplicating the code. As far as I can see, you >> share the following functions with PV reboot.c: >> >> -- shutdown_process >> -- __shutdown_handler >> -- shutdown_handler >> -- sysrq_handler >> -- setup_shutdown_event >> -- setup_shutdown_watcher >> >> You don't share: >> >> -- machine_emergency_restart >> -- machine_restart >> -- machine_halt >> -- machine_power_off >> -- switch_idle_mm >> -- pre_suspend >> -- post_suspend >> -- __do_suspend >> -- kthread_create_on_cpu >> >> To put it another way, your patch #if's out more than half the file. >> Given that, I think the code would be more maintainable if you moved >> machine_* and __do_suspend to a new file, perhaps machine_reboot.c. >> >>>> -- You set reboot_module from within a xenbus transaction. I don't >>>> think that's necessary, since xenbus_writes are supposed to be >>>> atomic anyway. >>> The reason why I use xenbus_write is that I could not find other >>> interface to write xenstore through xenbus module for HVM. I'm not sure >>> which interface you suggest to use, but for example, xb_write() is not >>> exported, so it can not be called from reboot module. If I should use >>> other interface, please let me know. >> I'm not objecting to the use of xenbus_write, but the use of >> xenbus_transaction_start: you're only doing one write, so you can just >> go xenbus_write(XBT_NULL, "control", "reboot_module", "installed") >> rather than having the loop in setup_shutdown_event. >> >> I'm also not sure why this is #ifndef CONFIG_XEN. It seems like it >> would be a good idea to set reboot_module in PV domains as well, just >> for consistency. >> >>> +#ifndef CONFIG_XEN >>> +MODULE_LICENSE("Dual BSD/GPL"); >>> +#endif /* !CONFIG_XEN */ >> Does this actually need the #ifdefs? If we're CONFIG_XEN, we're not a >> module, so MODULE_LICENSE gets preprocessored away, doesn't it? >> >>> static int shutdown_process(void *__unused) >>> { >>> @@ -222,12 +232,17 @@ static int shutdown_process(void *__unus >>> >>> if ((shutting_down == SHUTDOWN_POWEROFF) || >>> (shutting_down == SHUTDOWN_HALT)) { >>> +#ifdef CONFIG_XEN >>> if (execve("/sbin/poweroff", poweroff_argv, envp) < 0) { >>> sys_reboot(LINUX_REBOOT_MAGIC1, >>> LINUX_REBOOT_MAGIC2, >>> LINUX_REBOOT_CMD_POWER_OFF, >>> NULL); >>> } >>> +#else /* !CONFIG_XEN */ >>> + call_usermodehelper_keys("/sbin/poweroff", poweroff_argv, envp, > NULL, 0); >>> + >>> +#endif /* !CONFIG_XEN */ >> Hmm... it might make sense to use call_usermodehelper_keys in the >> CONFIG_XEN case. Did you try that? >> >>> static void __shutdown_handler(void *unused) >>> { >>> int err; >>> >>> +#ifdef CONFIG_XEN >>> if (shutting_down != SHUTDOWN_SUSPEND) >>> err = kernel_thread(shutdown_process, NULL, >>> CLONE_FS | CLONE_FILES); >>> else >>> err = kthread_create_on_cpu(__do_suspend, NULL, "suspend", 0); >>> >>> +#else /* !CONFIG_XEN */ >>> + err = kernel_thread(shutdown_process, NULL, >>> + CLONE_FS | CLONE_FILES); >>> +#endif /* !CONFIG_XEN */ >>> + >> I don't understand why this was necessary. Surely __do_suspend just >> returns an error if called from non-CONFIG_XEN? >> >> Steven. > > > > ------------------------------------------------------------------------ > > diff -r 38f9bd7a4ce6 linux-2.6-xen-sparse/drivers/xen/core/Makefile > --- a/linux-2.6-xen-sparse/drivers/xen/core/Makefile Tue Oct 03 11:39:22 > 2006 +0100 > +++ b/linux-2.6-xen-sparse/drivers/xen/core/Makefile Mon Oct 16 19:43:51 > 2006 +0900 > @@ -9,5 +9,5 @@ obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug > obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o > obj-$(CONFIG_XEN_SYSFS) += xen_sysfs.o > obj-$(CONFIG_XEN_SKBUFF) += skbuff.o > -obj-$(CONFIG_XEN_REBOOT) += reboot.o > +obj-$(CONFIG_XEN_REBOOT) += reboot.o machine_reboot.o > obj-$(CONFIG_XEN_SMPBOOT) += smpboot.o > diff -r 38f9bd7a4ce6 linux-2.6-xen-sparse/drivers/xen/core/reboot.c > --- a/linux-2.6-xen-sparse/drivers/xen/core/reboot.c Tue Oct 03 11:39:22 > 2006 +0100 > +++ b/linux-2.6-xen-sparse/drivers/xen/core/reboot.c Wed Oct 18 15:46:31 > 2006 +0900 > @@ -1,215 +1,19 @@ > #define __KERNEL_SYSCALLS__ > #include <linux/version.h> > #include <linux/kernel.h> > -#include <linux/mm.h> > #include <linux/unistd.h> > #include <linux/module.h> > #include <linux/reboot.h> > #include <linux/sysrq.h> > -#include <linux/stringify.h> > -#include <asm/irq.h> > -#include <asm/mmu_context.h> > -#include <xen/evtchn.h> > #include <asm/hypervisor.h> > -#include <xen/interface/dom0_ops.h> > #include <xen/xenbus.h> > -#include <linux/cpu.h> > #include <linux/kthread.h> > -#include <xen/gnttab.h> > -#include <xen/xencons.h> > -#include <xen/cpu_hotplug.h> > +#include <xen/reboot.h> > > -extern void ctrl_alt_del(void); > +MODULE_LICENSE("Dual BSD/GPL"); > > -#define SHUTDOWN_INVALID -1 > -#define SHUTDOWN_POWEROFF 0 > -#define SHUTDOWN_SUSPEND 2 > -/* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only > - * report a crash, not be instructed to crash! > - * HALT is the same as POWEROFF, as far as we're concerned. The tools use > - * the distinction when we return the reason code to them. > - */ > -#define SHUTDOWN_HALT 4 > - > -#if defined(__i386__) || defined(__x86_64__) > - > -/* > - * Power off function, if any > - */ > -void (*pm_power_off)(void); > -EXPORT_SYMBOL(pm_power_off); > - > -void machine_emergency_restart(void) > -{ > - /* We really want to get pending console data out before we die. */ > - xencons_force_flush(); > - HYPERVISOR_shutdown(SHUTDOWN_reboot); > -} > - > -void machine_restart(char * __unused) > -{ > - machine_emergency_restart(); > -} > - > -void machine_halt(void) > -{ > - machine_power_off(); > -} > - > -void machine_power_off(void) > -{ > - /* We really want to get pending console data out before we die. */ > - xencons_force_flush(); > - if (pm_power_off) > - pm_power_off(); > - HYPERVISOR_shutdown(SHUTDOWN_poweroff); > -} > - > -int reboot_thru_bios = 0; /* for dmi_scan.c */ > -EXPORT_SYMBOL(machine_restart); > -EXPORT_SYMBOL(machine_halt); > -EXPORT_SYMBOL(machine_power_off); > - > -#endif /* defined(__i386__) || defined(__x86_64__) */ > - > -/****************************************************************************** > - * Stop/pickle callback handling. > - */ > - > -/* Ignore multiple shutdown requests. */ > -static int shutting_down = SHUTDOWN_INVALID; > static void __shutdown_handler(void *unused); > static DECLARE_WORK(shutdown_work, __shutdown_handler, NULL); > - > -#if defined(__i386__) || defined(__x86_64__) > - > -/* Ensure we run on the idle task page tables so that we will > - switch page tables before running user space. This is needed > - on architectures with separate kernel and user page tables > - because the user page table pointer is not saved/restored. */ > -static void switch_idle_mm(void) > -{ > - struct mm_struct *mm = current->active_mm; > - > - if (mm == &init_mm) > - return; > - > - atomic_inc(&init_mm.mm_count); > - switch_mm(mm, &init_mm, current); > - current->active_mm = &init_mm; > - mmdrop(mm); > -} > - > -static void pre_suspend(void) > -{ > - HYPERVISOR_shared_info = (shared_info_t *)empty_zero_page; > - clear_fixmap(FIX_SHARED_INFO); > - > - xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn); > - xen_start_info->console.domU.mfn = > - mfn_to_pfn(xen_start_info->console.domU.mfn); > -} > - > -static void post_suspend(void) > -{ > - int i, j, k, fpp; > - extern unsigned long max_pfn; > - extern unsigned long *pfn_to_mfn_frame_list_list; > - extern unsigned long *pfn_to_mfn_frame_list[]; > - > - set_fixmap(FIX_SHARED_INFO, xen_start_info->shared_info); > - > - HYPERVISOR_shared_info = (shared_info_t *)fix_to_virt(FIX_SHARED_INFO); > - > - memset(empty_zero_page, 0, PAGE_SIZE); > - > - HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = > - virt_to_mfn(pfn_to_mfn_frame_list_list); > - > - fpp = PAGE_SIZE/sizeof(unsigned long); > - for (i = 0, j = 0, k = -1; i < max_pfn; i += fpp, j++) { > - if ((j % fpp) == 0) { > - k++; > - pfn_to_mfn_frame_list_list[k] = > - virt_to_mfn(pfn_to_mfn_frame_list[k]); > - j = 0; > - } > - pfn_to_mfn_frame_list[k][j] = > - virt_to_mfn(&phys_to_machine_mapping[i]); > - } > - HYPERVISOR_shared_info->arch.max_pfn = max_pfn; > -} > - > -#else /* !(defined(__i386__) || defined(__x86_64__)) */ > - > -#define switch_idle_mm() ((void)0) > -#define mm_pin_all() ((void)0) > -#define pre_suspend() ((void)0) > -#define post_suspend() ((void)0) > - > -#endif > - > -static int __do_suspend(void *ignore) > -{ > - int err; > - > - extern void time_resume(void); > - > - BUG_ON(smp_processor_id() != 0); > - BUG_ON(in_interrupt()); > - > -#if defined(__i386__) || defined(__x86_64__) > - if (xen_feature(XENFEAT_auto_translated_physmap)) { > - printk(KERN_WARNING "Cannot suspend in " > - "auto_translated_physmap mode.\n"); > - return -EOPNOTSUPP; > - } > -#endif > - > - err = smp_suspend(); > - if (err) > - return err; > - > - xenbus_suspend(); > - > - preempt_disable(); > - > - mm_pin_all(); > - local_irq_disable(); > - preempt_enable(); > - > - gnttab_suspend(); > - > - pre_suspend(); > - > - /* > - * We'll stop somewhere inside this hypercall. When it returns, > - * we'll start resuming after the restore. > - */ > - HYPERVISOR_suspend(virt_to_mfn(xen_start_info)); > - > - shutting_down = SHUTDOWN_INVALID; > - > - post_suspend(); > - > - gnttab_resume(); > - > - irq_resume(); > - > - time_resume(); > - > - switch_idle_mm(); > - > - local_irq_enable(); > - > - xencons_resume(); > - > - xenbus_resume(); > - > - smp_resume(); > - > - return err; > -} > > static int shutdown_process(void *__unused) > { > @@ -222,11 +26,13 @@ static int shutdown_process(void *__unus > > if ((shutting_down == SHUTDOWN_POWEROFF) || > (shutting_down == SHUTDOWN_HALT)) { > - if (execve("/sbin/poweroff", poweroff_argv, envp) < 0) { > + if (call_usermodehelper_keys("/sbin/poweroff", poweroff_argv, > envp, NULL, 0) < 0) { > +#ifdef CONFIG_XEN > sys_reboot(LINUX_REBOOT_MAGIC1, > LINUX_REBOOT_MAGIC2, > LINUX_REBOOT_CMD_POWER_OFF, > NULL); > +#endif /* CONFIG_XEN */ > } > } > > @@ -235,29 +41,21 @@ static int shutdown_process(void *__unus > return 0; > } > > -static int kthread_create_on_cpu(int (*f)(void *arg), > - void *arg, > - const char *name, > - int cpu) > -{ > - struct task_struct *p; > - p = kthread_create(f, arg, name); > - if (IS_ERR(p)) > - return PTR_ERR(p); > - kthread_bind(p, cpu); > - wake_up_process(p); > - return 0; > -} > > static void __shutdown_handler(void *unused) > { > int err; > > +#ifdef CONFIG_XEN > if (shutting_down != SHUTDOWN_SUSPEND) > err = kernel_thread(shutdown_process, NULL, > CLONE_FS | CLONE_FILES); > else > err = kthread_create_on_cpu(__do_suspend, NULL, "suspend", 0); > +#else /* !CONFIG_XEN */ > + err = kernel_thread(shutdown_process, NULL, > + CLONE_FS | CLONE_FILES); > +#endif /* !CONFIG_XEN */ > > if (err < 0) { > printk(KERN_WARNING "Error creating shutdown process (%d): " > @@ -272,6 +70,8 @@ static void shutdown_handler(struct xenb > char *str; > struct xenbus_transaction xbt; > int err; > + > + int cad_pid = 1; > > if (shutting_down != SHUTDOWN_INVALID) > return; > @@ -298,7 +98,7 @@ static void shutdown_handler(struct xenb > if (strcmp(str, "poweroff") == 0) > shutting_down = SHUTDOWN_POWEROFF; > else if (strcmp(str, "reboot") == 0) > - ctrl_alt_del(); > + kill_proc(cad_pid, SIGINT, 1); > else if (strcmp(str, "suspend") == 0) > shutting_down = SHUTDOWN_SUSPEND; > else if (strcmp(str, "halt") == 0) > @@ -378,6 +178,9 @@ static int __init setup_shutdown_event(v > .notifier_call = setup_shutdown_watcher > }; > register_xenstore_notifier(&xenstore_notifier); > + > + xenbus_write(XBT_NIL, "control", "reboot_module", "installed"); > + > return 0; > } > > diff -r 38f9bd7a4ce6 tools/python/xen/xend/image.py > --- a/tools/python/xen/xend/image.py Tue Oct 03 11:39:22 2006 +0100 > +++ b/tools/python/xen/xend/image.py Mon Oct 16 18:52:49 2006 +0900 > @@ -281,6 +281,7 @@ class HVMImageHandler(ImageHandler): > log.debug("apic = %d", self.apic) > > self.register_shutdown_watch() > + self.register_reboot_module_watch() > > return xc.hvm_build(dom = self.vm.getDomid(), > image = self.kernel, > @@ -383,6 +384,7 @@ class HVMImageHandler(ImageHandler): > > def destroy(self): > self.unregister_shutdown_watch(); > + self.unregister_reboot_module_watch(); > import signal > if not self.pid: > return > @@ -425,6 +427,39 @@ class HVMImageHandler(ImageHandler): > vm.refreshShutdown(vm.info) > > return 1 # Keep watching > + > + def register_reboot_module_watch(self): > + """ add xen store watch on control/reboot_module """ > + self.rebootModuleWatch = xswatch(self.vm.dompath + > "/control/reboot_module", \ > + self.hvm_reboot_module) > + log.debug("hvm reboot module watch registered") > + > + def unregister_reboot_module_watch(self): > + """Remove the watch on the control/reboot_module, if any. Nothrow > + guarantee.""" > + > + try: > + if self.rebootModuleWatch: > + self.rebootModuleWatch.unwatch() > + except: > + log.exception("Unwatching hvm reboot module watch failed.") > + self.rebootModuleWatch = None > + log.debug("hvm reboot module watch unregistered") > + > + def hvm_reboot_module(self, _): > + """ watch call back on node control/reboot_module, > + if node changed, this function will be called > + """ > + xd = xen.xend.XendDomain.instance() > + vm = xd.domain_lookup( self.vm.getDomid() ) > + > + reboot_module_status = vm.readDom('control/reboot_module') > + log.debug("hvm_reboot_module fired, module status=%s", > reboot_module_status) > + if reboot_module_status == 'installed': > + self.unregister_shutdown_watch() > + > + return 1 # Keep watching > + > > class IA64_HVM_ImageHandler(HVMImageHandler): > > diff -r 38f9bd7a4ce6 unmodified_drivers/linux-2.6/Makefile > --- a/unmodified_drivers/linux-2.6/Makefile Tue Oct 03 11:39:22 2006 +0100 > +++ b/unmodified_drivers/linux-2.6/Makefile Mon Oct 16 18:52:49 2006 +0900 > @@ -4,3 +4,4 @@ obj-m += xenbus/ > obj-m += xenbus/ > obj-m += blkfront/ > obj-m += netfront/ > +obj-m += util/ > diff -r 38f9bd7a4ce6 unmodified_drivers/linux-2.6/mkbuildtree > --- a/unmodified_drivers/linux-2.6/mkbuildtree Tue Oct 03 11:39:22 > 2006 +0100 > +++ b/unmodified_drivers/linux-2.6/mkbuildtree Mon Oct 16 18:52:49 > 2006 +0900 > @@ -14,6 +14,7 @@ ln -sf ${XL}/drivers/xen/core/gnttab.c p > ln -sf ${XL}/drivers/xen/core/gnttab.c platform-pci > ln -sf ${XL}/drivers/xen/core/features.c platform-pci > ln -sf ${XL}/drivers/xen/core/xen_proc.c xenbus > +ln -sf ${XL}/drivers/xen/core/reboot.c util > > mkdir -p include > mkdir -p include/xen > diff -r 38f9bd7a4ce6 linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c > --- /dev/null Thu Jan 01 00:00:00 1970 +0000 > +++ b/linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c Mon Oct 16 > 21:55:32 2006 +0900 > @@ -0,0 +1,206 @@ > +#define __KERNEL_SYSCALLS__ > +#include <linux/version.h> > +#include <linux/kernel.h> > +#include <linux/mm.h> > +#include <linux/unistd.h> > +#include <linux/module.h> > +#include <linux/reboot.h> > +#include <linux/sysrq.h> > +#include <linux/stringify.h> > +#include <asm/irq.h> > +#include <asm/mmu_context.h> > +#include <xen/evtchn.h> > +#include <asm/hypervisor.h> > +#include <xen/interface/dom0_ops.h> > +#include <xen/xenbus.h> > +#include <linux/cpu.h> > +#include <linux/kthread.h> > +#include <xen/gnttab.h> > +#include <xen/xencons.h> > +#include <xen/cpu_hotplug.h> > +#include <xen/reboot.h> > + > +#if defined(__i386__) || defined(__x86_64__) > + > +/* > + * Power off function, if any > + */ > +void (*pm_power_off)(void); > +EXPORT_SYMBOL(pm_power_off); > + > +void machine_emergency_restart(void) > +{ > + /* We really want to get pending console data out before we die. */ > + xencons_force_flush(); > + HYPERVISOR_shutdown(SHUTDOWN_reboot); > +} > + > +void machine_restart(char * __unused) > +{ > + machine_emergency_restart(); > +} > + > +void machine_halt(void) > +{ > + machine_power_off(); > +} > + > +void machine_power_off(void) > +{ > + /* We really want to get pending console data out before we die. */ > + xencons_force_flush(); > + if (pm_power_off) > + pm_power_off(); > + HYPERVISOR_shutdown(SHUTDOWN_poweroff); > +} > + > +int reboot_thru_bios = 0; /* for dmi_scan.c */ > +EXPORT_SYMBOL(machine_restart); > +EXPORT_SYMBOL(machine_halt); > +EXPORT_SYMBOL(machine_power_off); > + > +#endif /* defined(__i386__) || defined(__x86_64__) */ > + > +#if defined(__i386__) || defined(__x86_64__) > + > +/* Ensure we run on the idle task page tables so that we will > + switch page tables before running user space. This is needed > + on architectures with separate kernel and user page tables > + because the user page table pointer is not saved/restored. */ > +static void switch_idle_mm(void) > +{ > + struct mm_struct *mm = current->active_mm; > + > + if (mm == &init_mm) > + return; > + > + atomic_inc(&init_mm.mm_count); > + switch_mm(mm, &init_mm, current); > + current->active_mm = &init_mm; > + mmdrop(mm); > +} > + > +static void pre_suspend(void) > +{ > + HYPERVISOR_shared_info = (shared_info_t *)empty_zero_page; > + clear_fixmap(FIX_SHARED_INFO); > + > + xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn); > + xen_start_info->console.domU.mfn = > + mfn_to_pfn(xen_start_info->console.domU.mfn); > +} > + > +static void post_suspend(void) > +{ > + int i, j, k, fpp; > + extern unsigned long max_pfn; > + extern unsigned long *pfn_to_mfn_frame_list_list; > + extern unsigned long *pfn_to_mfn_frame_list[]; > + > + set_fixmap(FIX_SHARED_INFO, xen_start_info->shared_info); > + > + HYPERVISOR_shared_info = (shared_info_t *)fix_to_virt(FIX_SHARED_INFO); > + > + memset(empty_zero_page, 0, PAGE_SIZE); > + > + HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list = > + virt_to_mfn(pfn_to_mfn_frame_list_list); > + > + fpp = PAGE_SIZE/sizeof(unsigned long); > + for (i = 0, j = 0, k = -1; i < max_pfn; i += fpp, j++) { > + if ((j % fpp) == 0) { > + k++; > + pfn_to_mfn_frame_list_list[k] = > + virt_to_mfn(pfn_to_mfn_frame_list[k]); > + j = 0; > + } > + pfn_to_mfn_frame_list[k][j] = > + virt_to_mfn(&phys_to_machine_mapping[i]); > + } > + HYPERVISOR_shared_info->arch.max_pfn = max_pfn; > +} > + > +#else /* !(defined(__i386__) || defined(__x86_64__)) */ > + > +#define switch_idle_mm() ((void)0) > +#define mm_pin_all() ((void)0) > +#define pre_suspend() ((void)0) > +#define post_suspend() ((void)0) > + > +#endif > + > +int __do_suspend(void *ignore) > +{ > + int err; > + > + extern void time_resume(void); > + > + BUG_ON(smp_processor_id() != 0); > + BUG_ON(in_interrupt()); > + > +#if defined(__i386__) || defined(__x86_64__) > + if (xen_feature(XENFEAT_auto_translated_physmap)) { > + printk(KERN_WARNING "Cannot suspend in " > + "auto_translated_physmap mode.\n"); > + return -EOPNOTSUPP; > + } > +#endif > + > + err = smp_suspend(); > + if (err) > + return err; > + > + xenbus_suspend(); > + > + preempt_disable(); > + > + mm_pin_all(); > + local_irq_disable(); > + preempt_enable(); > + > + gnttab_suspend(); > + > + pre_suspend(); > + > + /* > + * We'll stop somewhere inside this hypercall. When it returns, > + * we'll start resuming after the restore. > + */ > + HYPERVISOR_suspend(virt_to_mfn(xen_start_info)); > + > + shutting_down = SHUTDOWN_INVALID; > + > + post_suspend(); > + > + gnttab_resume(); > + > + irq_resume(); > + > + time_resume(); > + > + switch_idle_mm(); > + > + local_irq_enable(); > + > + xencons_resume(); > + > + xenbus_resume(); > + > + smp_resume(); > + > + return err; > +} > + > +int kthread_create_on_cpu(int (*f)(void *arg), > + void *arg, > + const char *name, > + int cpu) > +{ > + struct task_struct *p; > + p = kthread_create(f, arg, name); > + if (IS_ERR(p)) > + return PTR_ERR(p); > + kthread_bind(p, cpu); > + wake_up_process(p); > + return 0; > +} > diff -r 38f9bd7a4ce6 linux-2.6-xen-sparse/include/xen/reboot.h > --- /dev/null Thu Jan 01 00:00:00 1970 +0000 > +++ b/linux-2.6-xen-sparse/include/xen/reboot.h Mon Oct 16 22:35:22 > 2006 +0900 > @@ -0,0 +1,19 @@ > +#define SHUTDOWN_INVALID -1 > +#define SHUTDOWN_POWEROFF 0 > +#define SHUTDOWN_SUSPEND 2 > +/* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only > + * report a crash, not be instructed to crash! > + * HALT is the same as POWEROFF, as far as we're concerned. The tools use > + * the distinction when we return the reason code to them. > + */ > +#define SHUTDOWN_HALT 4 > + > +/****************************************************************************** > + * Stop/pickle callback handling. > + */ > + > +/* Ignore multiple shutdown requests. */ > +static int shutting_down = SHUTDOWN_INVALID; > + > +int kthread_create_on_cpu(int (*f)(void *), void *, const char *, int); > +int __do_suspend(void *); > > > ------------------------------------------------------------------------ > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-devel diff -r 4a320d26fc24 linux-2.6-xen-sparse/drivers/xen/core/Makefile
--- a/linux-2.6-xen-sparse/drivers/xen/core/Makefile Thu Oct 26 16:56:16
2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/core/Makefile Fri Oct 27 17:02:19
2006 +0900
@@ -9,5 +9,5 @@ obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug
obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o
obj-$(CONFIG_XEN_SYSFS) += xen_sysfs.o
obj-$(CONFIG_XEN_SKBUFF) += skbuff.o
-obj-$(CONFIG_XEN_REBOOT) += reboot.o
+obj-$(CONFIG_XEN_REBOOT) += reboot.o machine_reboot.o
obj-$(CONFIG_XEN_SMPBOOT) += smpboot.o
diff -r 4a320d26fc24 linux-2.6-xen-sparse/drivers/xen/core/reboot.c
--- a/linux-2.6-xen-sparse/drivers/xen/core/reboot.c Thu Oct 26 16:56:16
2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/core/reboot.c Fri Oct 27 17:03:46
2006 +0900
@@ -1,215 +1,19 @@
#define __KERNEL_SYSCALLS__
#include <linux/version.h>
#include <linux/kernel.h>
-#include <linux/mm.h>
#include <linux/unistd.h>
#include <linux/module.h>
#include <linux/reboot.h>
#include <linux/sysrq.h>
-#include <linux/stringify.h>
-#include <asm/irq.h>
-#include <asm/mmu_context.h>
-#include <xen/evtchn.h>
#include <asm/hypervisor.h>
-#include <xen/interface/dom0_ops.h>
#include <xen/xenbus.h>
-#include <linux/cpu.h>
#include <linux/kthread.h>
-#include <xen/gnttab.h>
-#include <xen/xencons.h>
-#include <xen/cpu_hotplug.h>
+#include <xen/reboot.h>
-extern void ctrl_alt_del(void);
+MODULE_LICENSE("Dual BSD/GPL");
-#define SHUTDOWN_INVALID -1
-#define SHUTDOWN_POWEROFF 0
-#define SHUTDOWN_SUSPEND 2
-/* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only
- * report a crash, not be instructed to crash!
- * HALT is the same as POWEROFF, as far as we're concerned. The tools use
- * the distinction when we return the reason code to them.
- */
-#define SHUTDOWN_HALT 4
-
-#if defined(__i386__) || defined(__x86_64__)
-
-/*
- * Power off function, if any
- */
-void (*pm_power_off)(void);
-EXPORT_SYMBOL(pm_power_off);
-
-void machine_emergency_restart(void)
-{
- /* We really want to get pending console data out before we die. */
- xencons_force_flush();
- HYPERVISOR_shutdown(SHUTDOWN_reboot);
-}
-
-void machine_restart(char * __unused)
-{
- machine_emergency_restart();
-}
-
-void machine_halt(void)
-{
- machine_power_off();
-}
-
-void machine_power_off(void)
-{
- /* We really want to get pending console data out before we die. */
- xencons_force_flush();
- if (pm_power_off)
- pm_power_off();
- HYPERVISOR_shutdown(SHUTDOWN_poweroff);
-}
-
-int reboot_thru_bios = 0; /* for dmi_scan.c */
-EXPORT_SYMBOL(machine_restart);
-EXPORT_SYMBOL(machine_halt);
-EXPORT_SYMBOL(machine_power_off);
-
-#endif /* defined(__i386__) || defined(__x86_64__) */
-
-/******************************************************************************
- * Stop/pickle callback handling.
- */
-
-/* Ignore multiple shutdown requests. */
-static int shutting_down = SHUTDOWN_INVALID;
static void __shutdown_handler(void *unused);
static DECLARE_WORK(shutdown_work, __shutdown_handler, NULL);
-
-#if defined(__i386__) || defined(__x86_64__)
-
-/* Ensure we run on the idle task page tables so that we will
- switch page tables before running user space. This is needed
- on architectures with separate kernel and user page tables
- because the user page table pointer is not saved/restored. */
-static void switch_idle_mm(void)
-{
- struct mm_struct *mm = current->active_mm;
-
- if (mm == &init_mm)
- return;
-
- atomic_inc(&init_mm.mm_count);
- switch_mm(mm, &init_mm, current);
- current->active_mm = &init_mm;
- mmdrop(mm);
-}
-
-static void pre_suspend(void)
-{
- HYPERVISOR_shared_info = (shared_info_t *)empty_zero_page;
- clear_fixmap(FIX_SHARED_INFO);
-
- xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
- xen_start_info->console.domU.mfn =
- mfn_to_pfn(xen_start_info->console.domU.mfn);
-}
-
-static void post_suspend(void)
-{
- int i, j, k, fpp;
- extern unsigned long max_pfn;
- extern unsigned long *pfn_to_mfn_frame_list_list;
- extern unsigned long *pfn_to_mfn_frame_list[];
-
- set_fixmap(FIX_SHARED_INFO, xen_start_info->shared_info);
-
- HYPERVISOR_shared_info = (shared_info_t *)fix_to_virt(FIX_SHARED_INFO);
-
- memset(empty_zero_page, 0, PAGE_SIZE);
-
- HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
- virt_to_mfn(pfn_to_mfn_frame_list_list);
-
- fpp = PAGE_SIZE/sizeof(unsigned long);
- for (i = 0, j = 0, k = -1; i < max_pfn; i += fpp, j++) {
- if ((j % fpp) == 0) {
- k++;
- pfn_to_mfn_frame_list_list[k] =
- virt_to_mfn(pfn_to_mfn_frame_list[k]);
- j = 0;
- }
- pfn_to_mfn_frame_list[k][j] =
- virt_to_mfn(&phys_to_machine_mapping[i]);
- }
- HYPERVISOR_shared_info->arch.max_pfn = max_pfn;
-}
-
-#else /* !(defined(__i386__) || defined(__x86_64__)) */
-
-#define switch_idle_mm() ((void)0)
-#define mm_pin_all() ((void)0)
-#define pre_suspend() ((void)0)
-#define post_suspend() ((void)0)
-
-#endif
-
-static int __do_suspend(void *ignore)
-{
- int err;
-
- extern void time_resume(void);
-
- BUG_ON(smp_processor_id() != 0);
- BUG_ON(in_interrupt());
-
-#if defined(__i386__) || defined(__x86_64__)
- if (xen_feature(XENFEAT_auto_translated_physmap)) {
- printk(KERN_WARNING "Cannot suspend in "
- "auto_translated_physmap mode.\n");
- return -EOPNOTSUPP;
- }
-#endif
-
- err = smp_suspend();
- if (err)
- return err;
-
- xenbus_suspend();
-
- preempt_disable();
-
- mm_pin_all();
- local_irq_disable();
- preempt_enable();
-
- gnttab_suspend();
-
- pre_suspend();
-
- /*
- * We'll stop somewhere inside this hypercall. When it returns,
- * we'll start resuming after the restore.
- */
- HYPERVISOR_suspend(virt_to_mfn(xen_start_info));
-
- shutting_down = SHUTDOWN_INVALID;
-
- post_suspend();
-
- gnttab_resume();
-
- irq_resume();
-
- time_resume();
-
- switch_idle_mm();
-
- local_irq_enable();
-
- xencons_resume();
-
- xenbus_resume();
-
- smp_resume();
-
- return err;
-}
static int shutdown_process(void *__unused)
{
@@ -222,11 +26,13 @@ static int shutdown_process(void *__unus
if ((shutting_down == SHUTDOWN_POWEROFF) ||
(shutting_down == SHUTDOWN_HALT)) {
- if (execve("/sbin/poweroff", poweroff_argv, envp) < 0) {
+ if (call_usermodehelper_keys("/sbin/poweroff", poweroff_argv,
envp, NULL, 0) < 0) {
+#ifdef CONFIG_XEN
sys_reboot(LINUX_REBOOT_MAGIC1,
LINUX_REBOOT_MAGIC2,
LINUX_REBOOT_CMD_POWER_OFF,
NULL);
+#endif /* CONFIG_XEN */
}
}
@@ -235,29 +41,21 @@ static int shutdown_process(void *__unus
return 0;
}
-static int kthread_create_on_cpu(int (*f)(void *arg),
- void *arg,
- const char *name,
- int cpu)
-{
- struct task_struct *p;
- p = kthread_create(f, arg, name);
- if (IS_ERR(p))
- return PTR_ERR(p);
- kthread_bind(p, cpu);
- wake_up_process(p);
- return 0;
-}
static void __shutdown_handler(void *unused)
{
int err;
+#ifdef CONFIG_XEN
if (shutting_down != SHUTDOWN_SUSPEND)
err = kernel_thread(shutdown_process, NULL,
CLONE_FS | CLONE_FILES);
else
err = kthread_create_on_cpu(__do_suspend, NULL, "suspend", 0);
+#else /* !CONFIG_XEN */
+ err = kernel_thread(shutdown_process, NULL,
+ CLONE_FS | CLONE_FILES);
+#endif /* !CONFIG_XEN */
if (err < 0) {
printk(KERN_WARNING "Error creating shutdown process (%d): "
@@ -272,6 +70,8 @@ static void shutdown_handler(struct xenb
char *str;
struct xenbus_transaction xbt;
int err;
+
+ int cad_pid = 1;
if (shutting_down != SHUTDOWN_INVALID)
return;
@@ -298,7 +98,7 @@ static void shutdown_handler(struct xenb
if (strcmp(str, "poweroff") == 0)
shutting_down = SHUTDOWN_POWEROFF;
else if (strcmp(str, "reboot") == 0)
- ctrl_alt_del();
+ kill_proc(cad_pid, SIGINT, 1);
else if (strcmp(str, "suspend") == 0)
shutting_down = SHUTDOWN_SUSPEND;
else if (strcmp(str, "halt") == 0)
@@ -378,6 +178,11 @@ static int __init setup_shutdown_event(v
.notifier_call = setup_shutdown_watcher
};
register_xenstore_notifier(&xenstore_notifier);
+
+ if (!is_initial_xendomain()) {
+ xenbus_write(XBT_NIL, "control", "reboot_module", "installed");
+ }
+
return 0;
}
diff -r 4a320d26fc24 tools/python/xen/xend/image.py
--- a/tools/python/xen/xend/image.py Thu Oct 26 16:56:16 2006 +0100
+++ b/tools/python/xen/xend/image.py Fri Oct 27 17:02:19 2006 +0900
@@ -282,6 +282,7 @@ class HVMImageHandler(ImageHandler):
log.debug("apic = %d", self.apic)
self.register_shutdown_watch()
+ self.register_reboot_module_watch()
return xc.hvm_build(dom = self.vm.getDomid(),
image = self.kernel,
@@ -422,6 +423,7 @@ class HVMImageHandler(ImageHandler):
def destroy(self):
self.unregister_shutdown_watch();
+ self.unregister_reboot_module_watch();
if not self.pid:
return
os.kill(self.pid, signal.SIGKILL)
@@ -463,6 +465,39 @@ class HVMImageHandler(ImageHandler):
vm.refreshShutdown(vm.info)
return 1 # Keep watching
+
+ def register_reboot_module_watch(self):
+ """ add xen store watch on control/reboot_module """
+ self.rebootModuleWatch = xswatch(self.vm.dompath +
"/control/reboot_module", \
+ self.hvm_reboot_module)
+ log.debug("hvm reboot module watch registered")
+
+ def unregister_reboot_module_watch(self):
+ """Remove the watch on the control/reboot_module, if any. Nothrow
+ guarantee."""
+
+ try:
+ if self.rebootModuleWatch:
+ self.rebootModuleWatch.unwatch()
+ except:
+ log.exception("Unwatching hvm reboot module watch failed.")
+ self.rebootModuleWatch = None
+ log.debug("hvm reboot module watch unregistered")
+
+ def hvm_reboot_module(self, _):
+ """ watch call back on node control/reboot_module,
+ if node changed, this function will be called
+ """
+ xd = xen.xend.XendDomain.instance()
+ vm = xd.domain_lookup( self.vm.getDomid() )
+
+ reboot_module_status = vm.readDom('control/reboot_module')
+ log.debug("hvm_reboot_module fired, module status=%s",
reboot_module_status)
+ if reboot_module_status == 'installed':
+ self.unregister_shutdown_watch()
+
+ return 1 # Keep watching
+
class IA64_HVM_ImageHandler(HVMImageHandler):
diff -r 4a320d26fc24 unmodified_drivers/linux-2.6/Makefile
--- a/unmodified_drivers/linux-2.6/Makefile Thu Oct 26 16:56:16 2006 +0100
+++ b/unmodified_drivers/linux-2.6/Makefile Fri Oct 27 17:02:19 2006 +0900
@@ -4,3 +4,4 @@ obj-m += xenbus/
obj-m += xenbus/
obj-m += blkfront/
obj-m += netfront/
+obj-m += util/
diff -r 4a320d26fc24 unmodified_drivers/linux-2.6/mkbuildtree
--- a/unmodified_drivers/linux-2.6/mkbuildtree Thu Oct 26 16:56:16 2006 +0100
+++ b/unmodified_drivers/linux-2.6/mkbuildtree Fri Oct 27 17:02:19 2006 +0900
@@ -22,6 +22,7 @@ ln -sf ${XL}/drivers/xen/core/gnttab.c p
ln -sf ${XL}/drivers/xen/core/gnttab.c platform-pci
ln -sf ${XL}/drivers/xen/core/features.c platform-pci
ln -sf ${XL}/drivers/xen/core/xen_proc.c xenbus
+ln -sf ${XL}/drivers/xen/core/reboot.c util
mkdir -p include
mkdir -p include/xen
diff -r 4a320d26fc24 linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/linux-2.6-xen-sparse/drivers/xen/core/machine_reboot.c Fri Oct 27
17:02:19 2006 +0900
@@ -0,0 +1,206 @@
+#define __KERNEL_SYSCALLS__
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/unistd.h>
+#include <linux/module.h>
+#include <linux/reboot.h>
+#include <linux/sysrq.h>
+#include <linux/stringify.h>
+#include <asm/irq.h>
+#include <asm/mmu_context.h>
+#include <xen/evtchn.h>
+#include <asm/hypervisor.h>
+#include <xen/interface/dom0_ops.h>
+#include <xen/xenbus.h>
+#include <linux/cpu.h>
+#include <linux/kthread.h>
+#include <xen/gnttab.h>
+#include <xen/xencons.h>
+#include <xen/cpu_hotplug.h>
+#include <xen/reboot.h>
+
+#if defined(__i386__) || defined(__x86_64__)
+
+/*
+ * Power off function, if any
+ */
+void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
+
+void machine_emergency_restart(void)
+{
+ /* We really want to get pending console data out before we die. */
+ xencons_force_flush();
+ HYPERVISOR_shutdown(SHUTDOWN_reboot);
+}
+
+void machine_restart(char * __unused)
+{
+ machine_emergency_restart();
+}
+
+void machine_halt(void)
+{
+ machine_power_off();
+}
+
+void machine_power_off(void)
+{
+ /* We really want to get pending console data out before we die. */
+ xencons_force_flush();
+ if (pm_power_off)
+ pm_power_off();
+ HYPERVISOR_shutdown(SHUTDOWN_poweroff);
+}
+
+int reboot_thru_bios = 0; /* for dmi_scan.c */
+EXPORT_SYMBOL(machine_restart);
+EXPORT_SYMBOL(machine_halt);
+EXPORT_SYMBOL(machine_power_off);
+
+#endif /* defined(__i386__) || defined(__x86_64__) */
+
+#if defined(__i386__) || defined(__x86_64__)
+
+/* Ensure we run on the idle task page tables so that we will
+ switch page tables before running user space. This is needed
+ on architectures with separate kernel and user page tables
+ because the user page table pointer is not saved/restored. */
+static void switch_idle_mm(void)
+{
+ struct mm_struct *mm = current->active_mm;
+
+ if (mm == &init_mm)
+ return;
+
+ atomic_inc(&init_mm.mm_count);
+ switch_mm(mm, &init_mm, current);
+ current->active_mm = &init_mm;
+ mmdrop(mm);
+}
+
+static void pre_suspend(void)
+{
+ HYPERVISOR_shared_info = (shared_info_t *)empty_zero_page;
+ clear_fixmap(FIX_SHARED_INFO);
+
+ xen_start_info->store_mfn = mfn_to_pfn(xen_start_info->store_mfn);
+ xen_start_info->console.domU.mfn =
+ mfn_to_pfn(xen_start_info->console.domU.mfn);
+}
+
+static void post_suspend(void)
+{
+ int i, j, k, fpp;
+ extern unsigned long max_pfn;
+ extern unsigned long *pfn_to_mfn_frame_list_list;
+ extern unsigned long *pfn_to_mfn_frame_list[];
+
+ set_fixmap(FIX_SHARED_INFO, xen_start_info->shared_info);
+
+ HYPERVISOR_shared_info = (shared_info_t *)fix_to_virt(FIX_SHARED_INFO);
+
+ memset(empty_zero_page, 0, PAGE_SIZE);
+
+ HYPERVISOR_shared_info->arch.pfn_to_mfn_frame_list_list =
+ virt_to_mfn(pfn_to_mfn_frame_list_list);
+
+ fpp = PAGE_SIZE/sizeof(unsigned long);
+ for (i = 0, j = 0, k = -1; i < max_pfn; i += fpp, j++) {
+ if ((j % fpp) == 0) {
+ k++;
+ pfn_to_mfn_frame_list_list[k] =
+ virt_to_mfn(pfn_to_mfn_frame_list[k]);
+ j = 0;
+ }
+ pfn_to_mfn_frame_list[k][j] =
+ virt_to_mfn(&phys_to_machine_mapping[i]);
+ }
+ HYPERVISOR_shared_info->arch.max_pfn = max_pfn;
+}
+
+#else /* !(defined(__i386__) || defined(__x86_64__)) */
+
+#define switch_idle_mm() ((void)0)
+#define mm_pin_all() ((void)0)
+#define pre_suspend() ((void)0)
+#define post_suspend() ((void)0)
+
+#endif
+
+int __do_suspend(void *ignore)
+{
+ int err;
+
+ extern void time_resume(void);
+
+ BUG_ON(smp_processor_id() != 0);
+ BUG_ON(in_interrupt());
+
+#if defined(__i386__) || defined(__x86_64__)
+ if (xen_feature(XENFEAT_auto_translated_physmap)) {
+ printk(KERN_WARNING "Cannot suspend in "
+ "auto_translated_physmap mode.\n");
+ return -EOPNOTSUPP;
+ }
+#endif
+
+ err = smp_suspend();
+ if (err)
+ return err;
+
+ xenbus_suspend();
+
+ preempt_disable();
+
+ mm_pin_all();
+ local_irq_disable();
+ preempt_enable();
+
+ gnttab_suspend();
+
+ pre_suspend();
+
+ /*
+ * We'll stop somewhere inside this hypercall. When it returns,
+ * we'll start resuming after the restore.
+ */
+ HYPERVISOR_suspend(virt_to_mfn(xen_start_info));
+
+ shutting_down = SHUTDOWN_INVALID;
+
+ post_suspend();
+
+ gnttab_resume();
+
+ irq_resume();
+
+ time_resume();
+
+ switch_idle_mm();
+
+ local_irq_enable();
+
+ xencons_resume();
+
+ xenbus_resume();
+
+ smp_resume();
+
+ return err;
+}
+
+int kthread_create_on_cpu(int (*f)(void *arg),
+ void *arg,
+ const char *name,
+ int cpu)
+{
+ struct task_struct *p;
+ p = kthread_create(f, arg, name);
+ if (IS_ERR(p))
+ return PTR_ERR(p);
+ kthread_bind(p, cpu);
+ wake_up_process(p);
+ return 0;
+}
diff -r 4a320d26fc24 linux-2.6-xen-sparse/include/xen/reboot.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/linux-2.6-xen-sparse/include/xen/reboot.h Fri Oct 27 17:02:19 2006 +0900
@@ -0,0 +1,19 @@
+#define SHUTDOWN_INVALID -1
+#define SHUTDOWN_POWEROFF 0
+#define SHUTDOWN_SUSPEND 2
+/* Code 3 is SHUTDOWN_CRASH, which we don't use because the domain can only
+ * report a crash, not be instructed to crash!
+ * HALT is the same as POWEROFF, as far as we're concerned. The tools use
+ * the distinction when we return the reason code to them.
+ */
+#define SHUTDOWN_HALT 4
+
+/******************************************************************************
+ * Stop/pickle callback handling.
+ */
+
+/* Ignore multiple shutdown requests. */
+static int shutting_down = SHUTDOWN_INVALID;
+
+int kthread_create_on_cpu(int (*f)(void *), void *, const char *, int);
+int __do_suspend(void *);
diff -r 4a320d26fc24 unmodified_drivers/linux-2.6/util/Kbuild
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/unmodified_drivers/linux-2.6/util/Kbuild Fri Oct 27 17:02:19 2006 +0900
@@ -0,0 +1,3 @@
+include $(M)/overrides.mk
+
+obj-m := reboot.o
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