From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eduardo Habkost Subject: [PATCH 01/15] x86 kdump: Extract kdump-specific code from crash_nmi_callback() Date: Wed, 5 Nov 2008 17:56:44 -0200 Message-ID: <1225915018-6548-2-git-send-email-ehabkost@redhat.com> References: <1225915018-6548-1-git-send-email-ehabkost@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Andrew Morton , Eduardo Habkost , kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, "Rafael J. Wysocki" , Haren Myneni , Simon Horman , "Eric W. Biederman" , Andrey Borzenkov , mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, Vivek Goyal To: Avi Kivity , Ingo Molnar Return-path: In-Reply-To: <1225915018-6548-1-git-send-email-ehabkost-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kexec-bounces-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org Errors-To: kexec-bounces+glkk-kexec=m.gmane.org-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org List-Id: kvm.vger.kernel.org The NMI CPU-halting code will be used on non-kdump cases, also (e.g. emergency_reboot when virtualization is enabled). Signed-off-by: Eduardo Habkost --- arch/x86/kernel/crash.c | 31 ++++++++++++++++++++----------- 1 files changed, 20 insertions(+), 11 deletions(-) diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c index 81e01f7..d82ac72 100644 --- a/arch/x86/kernel/crash.c +++ b/arch/x86/kernel/crash.c @@ -35,19 +35,34 @@ static int crashing_cpu; #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC) static atomic_t waiting_for_crash_ipi; -static int crash_nmi_callback(struct notifier_block *self, - unsigned long val, void *data) +static void kdump_nmi_callback(int cpu, struct die_args *args) { struct pt_regs *regs; #ifdef CONFIG_X86_32 struct pt_regs fixed_regs; #endif + + regs = args->regs; + +#ifdef CONFIG_X86_32 + if (!user_mode_vm(regs)) { + crash_fixup_ss_esp(&fixed_regs, regs); + regs = &fixed_regs; + } +#endif + crash_save_cpu(regs, cpu); + + disable_local_APIC(); +} + +static int crash_nmi_callback(struct notifier_block *self, + unsigned long val, void *data) +{ int cpu; if (val != DIE_NMI_IPI) return NOTIFY_OK; - regs = ((struct die_args *)data)->regs; cpu = raw_smp_processor_id(); /* Don't do anything if this handler is invoked on crashing cpu. @@ -58,14 +73,8 @@ static int crash_nmi_callback(struct notifier_block *self, return NOTIFY_STOP; local_irq_disable(); -#ifdef CONFIG_X86_32 - if (!user_mode_vm(regs)) { - crash_fixup_ss_esp(&fixed_regs, regs); - regs = &fixed_regs; - } -#endif - crash_save_cpu(regs, cpu); - disable_local_APIC(); + kdump_nmi_callback(cpu, (struct die_args *)data); + atomic_dec(&waiting_for_crash_ipi); /* Assume hlt works */ halt(); -- 1.5.5.GIT