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From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
To: x86@kernel.org, kexec@lists.infradead.org,
	linux-doc@vger.kernel.org, Avi Kivity <avi@redhat.com>,
	mtosatti@redhat.com
Cc: linux-kernel@vger.kernel.org,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: [PATCH 3/3] sysctl: introduce a new interface to control kdump-vmcs-clear behaviour
Date: Fri, 12 Oct 2012 14:45:22 +0800	[thread overview]
Message-ID: <5077BC82.6050105@cn.fujitsu.com> (raw)
In-Reply-To: <5077BB7B.4030203@cn.fujitsu.com>

This patch exports the variable clear_loaded_vmcs_enabled to userspace.

Signed-off-by: zhangyanfei <zhangyanfei@cn.fujitsu.com>
---
 Documentation/sysctl/kernel.txt |    8 ++++++++
 kernel/sysctl.c                 |   10 ++++++++++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 6d78841..038148b 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -25,6 +25,7 @@ show up in /proc/sys/kernel:
 - bootloader_version	     [ X86 only ]
 - callhome		     [ S390 only ]
 - cap_last_cap
+- clear_loaded_vmcs	     [ X86 only ]
 - core_pattern
 - core_pipe_limit
 - core_uses_pid
@@ -164,6 +165,13 @@ CAP_LAST_CAP from the kernel.
 
 ==============================================================
 
+clear_loaded_vmcs
+
+Controls if VMCSs should be cleared when host is doing kdump.  Exports
+clear_loaded_vmcs_enabled from the kernel.
+
+==============================================================
+
 core_pattern:
 
 core_pattern is used to specify a core dumpfile pattern name.
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 4ab1187..3ab7d9c 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -63,6 +63,7 @@
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
+#include <asm/kexec.h>
 
 #ifdef CONFIG_X86
 #include <asm/nmi.h>
@@ -994,6 +995,15 @@ static struct ctl_table kern_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
+#ifdef CONFIG_KEXEC
+	{
+		.procname	= "clear_loaded_vmcs",
+		.data		= &clear_loaded_vmcs_enabled,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+#endif
 	{ }
 };
 
-- 
1.7.1

_______________________________________________
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kexec@lists.infradead.org
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WARNING: multiple messages have this Message-ID (diff)
From: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
To: x86@kernel.org, kexec@lists.infradead.org,
	linux-doc@vger.kernel.org, Avi Kivity <avi@redhat.com>,
	mtosatti@redhat.com
Cc: linux-kernel@vger.kernel.org,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: [PATCH 3/3] sysctl: introduce a new interface to control kdump-vmcs-clear behaviour
Date: Fri, 12 Oct 2012 14:45:22 +0800	[thread overview]
Message-ID: <5077BC82.6050105@cn.fujitsu.com> (raw)
In-Reply-To: <5077BB7B.4030203@cn.fujitsu.com>

This patch exports the variable clear_loaded_vmcs_enabled to userspace.

Signed-off-by: zhangyanfei <zhangyanfei@cn.fujitsu.com>
---
 Documentation/sysctl/kernel.txt |    8 ++++++++
 kernel/sysctl.c                 |   10 ++++++++++
 2 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 6d78841..038148b 100644
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -25,6 +25,7 @@ show up in /proc/sys/kernel:
 - bootloader_version	     [ X86 only ]
 - callhome		     [ S390 only ]
 - cap_last_cap
+- clear_loaded_vmcs	     [ X86 only ]
 - core_pattern
 - core_pipe_limit
 - core_uses_pid
@@ -164,6 +165,13 @@ CAP_LAST_CAP from the kernel.
 
 ==============================================================
 
+clear_loaded_vmcs
+
+Controls if VMCSs should be cleared when host is doing kdump.  Exports
+clear_loaded_vmcs_enabled from the kernel.
+
+==============================================================
+
 core_pattern:
 
 core_pattern is used to specify a core dumpfile pattern name.
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 4ab1187..3ab7d9c 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -63,6 +63,7 @@
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
+#include <asm/kexec.h>
 
 #ifdef CONFIG_X86
 #include <asm/nmi.h>
@@ -994,6 +995,15 @@ static struct ctl_table kern_table[] = {
 		.proc_handler	= proc_dointvec,
 	},
 #endif
+#ifdef CONFIG_KEXEC
+	{
+		.procname	= "clear_loaded_vmcs",
+		.data		= &clear_loaded_vmcs_enabled,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec,
+	},
+#endif
 	{ }
 };
 
-- 
1.7.1

  parent reply	other threads:[~2012-10-12  6:46 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-12  6:40 [PATCH 0/3] x86: clear vmcss on all cpus when doing kdump if necessary Zhang Yanfei
2012-10-12  6:40 ` Zhang Yanfei
2012-10-12  6:43 ` [PATCH 1/3] x86/kexec: clear vmcss on all cpus " Zhang Yanfei
2012-10-12  6:43   ` Zhang Yanfei
2012-10-12  6:44 ` [PATCH 2/3] KVM: make crash_clear_loaded_vmcss valid when kvm_intel is loaded Zhang Yanfei
2012-10-12  6:44   ` Zhang Yanfei
2012-10-12  6:45 ` Zhang Yanfei [this message]
2012-10-12  6:45   ` [PATCH 3/3] sysctl: introduce a new interface to control kdump-vmcs-clear behaviour Zhang Yanfei
2012-10-15 15:43 ` [PATCH 0/3] x86: clear vmcss on all cpus when doing kdump if necessary Avi Kivity
2012-10-15 15:43   ` Avi Kivity
2012-10-15 15:43   ` Avi Kivity
2012-10-17  2:28   ` Zhang Yanfei
2012-10-17  2:28     ` Zhang Yanfei
2012-10-17 10:16     ` Avi Kivity
2012-10-17 10:16       ` Avi Kivity
2012-10-18  1:12       ` Zhang Yanfei
2012-10-18  1:12         ` Zhang Yanfei
2012-10-18 10:55         ` Avi Kivity
2012-10-18 10:55           ` Avi Kivity
2012-10-19  4:51           ` Zhang Yanfei
2012-10-19  4:51             ` Zhang Yanfei

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