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Subject[PATCH 3/4] ksysfs: export VMCSINFO via sysfs
This patch creates sysfs file to export where VMCSINFO is allocated,
as below:
$ cat /sys/kernel/vmcsinfo
1cb88a0 2000
number on the left-hand side is the physical address of VMCSINFO,
while the one on the right-hand side is the max size of VMCSINFO.

Signed-off-by: zhangyanfei <zhangyanfei@cn.fujitsu.com>
---
kernel/ksysfs.c | 19 +++++++++++++++++++
1 files changed, 19 insertions(+), 0 deletions(-)
diff --git a/kernel/ksysfs.c b/kernel/ksysfs.c
index 4e316e1..becbb68 100644
--- a/kernel/ksysfs.c
+++ b/kernel/ksysfs.c
@@ -18,6 +18,8 @@
#include <linux/stat.h>
#include <linux/sched.h>
#include <linux/capability.h>
+#include <asm/vmcsinfo.h>
+#include <asm/virtext.h>

#define KERNEL_ATTR_RO(_name) \
static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
@@ -133,6 +135,20 @@ KERNEL_ATTR_RO(vmcoreinfo);

#endif /* CONFIG_KEXEC */

+#ifdef CONFIG_X86
+static ssize_t vmcsinfo_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ if (cpu_has_vmx())
+ return sprintf(buf, "%lx %x\n",
+ paddr_vmcsinfo_note(),
+ (unsigned int)vmcsinfo_max_size);
+ return 0;
+}
+KERNEL_ATTR_RO(vmcsinfo);
+
+#endif /* CONFIG_X86 */
+
/* whether file capabilities are enabled */
static ssize_t fscaps_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
@@ -182,6 +198,9 @@ static struct attribute * kernel_attrs[] = {
&kexec_crash_size_attr.attr,
&vmcoreinfo_attr.attr,
#endif
+#ifdef CONFIG_X86
+ &vmcsinfo_attr.attr,
+#endif
NULL
};

--
1.7.1

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