From mboxrd@z Thu Jan 1 00:00:00 1970 From: Zhang Yanfei Subject: [PATCH v8 1/2] x86/kexec: add a new atomic notifier list for kdump Date: Thu, 22 Nov 2012 16:23:54 +0800 Message-ID: <50ADE11A.401@cn.fujitsu.com> References: <50ADE0C2.1000106@cn.fujitsu.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" To: "x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org" , "kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , Marcelo Tosatti , Gleb Natapov Return-path: In-Reply-To: <50ADE0C2.1000106-BthXqXjhjHXQFUHtdCDX3A@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 This patch adds an atomic notifier list named crash_notifier_list. Currently, when loading kvm-intel module, a notifier will be registered in the list to enable vmcss loaded on all cpus to be VMCLEAR'd if needed. Signed-off-by: Zhang Yanfei --- arch/x86/include/asm/kexec.h | 2 ++ arch/x86/kernel/crash.c | 9 +++++++++ 2 files changed, 11 insertions(+), 0 deletions(-) diff --git a/arch/x86/include/asm/kexec.h b/arch/x86/include/asm/kexec.h index 317ff17..5e22b00 100644 --- a/arch/x86/include/asm/kexec.h +++ b/arch/x86/include/asm/kexec.h @@ -163,6 +163,8 @@ struct kimage_arch { }; #endif +extern struct atomic_notifier_head crash_notifier_list; + #endif /* __ASSEMBLY__ */ #endif /* _ASM_X86_KEXEC_H */ diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c index 13ad899..c5b2f70 100644 --- a/arch/x86/kernel/crash.c +++ b/arch/x86/kernel/crash.c @@ -16,6 +16,8 @@ #include #include #include +#include +#include #include #include @@ -30,6 +32,9 @@ int in_crash_kexec; +ATOMIC_NOTIFIER_HEAD(crash_notifier_list); +EXPORT_SYMBOL_GPL(crash_notifier_list); + #if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC) static void kdump_nmi_callback(int cpu, struct pt_regs *regs) @@ -46,6 +51,8 @@ static void kdump_nmi_callback(int cpu, struct pt_regs *regs) #endif crash_save_cpu(regs, cpu); + atomic_notifier_call_chain(&crash_notifier_list, 0, NULL); + /* Disable VMX or SVM if needed. * * We need to disable virtualization on all CPUs. @@ -88,6 +95,8 @@ void native_machine_crash_shutdown(struct pt_regs *regs) kdump_nmi_shootdown_cpus(); + atomic_notifier_call_chain(&crash_notifier_list, 0, NULL); + /* Booting kdump kernel with VMX or SVM enabled won't work, * because (among other limitations) we can't disable paging * with the virt flags. -- 1.7.1