From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: david.vrabel@citrix.com, konrad.wilk@oracle.com
Cc: boris.ostrovsky@oracle.com, kevin.tian@intel.com,
dietmar.hahn@ts.fujitsu.com, JBeulich@suse.com,
xen-devel@lists.xen.org
Subject: [PATCH v2 1/6] xen: xensyms support
Date: Fri, 6 Jun 2014 13:44:41 -0400 [thread overview]
Message-ID: <1402076686-26586-2-git-send-email-boris.ostrovsky@oracle.com> (raw)
In-Reply-To: <1402076686-26586-1-git-send-email-boris.ostrovsky@oracle.com>
Export Xen symbols to dom0 via /proc/xen/xensyms (similar to /proc/kallsyms).
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
drivers/xen/Kconfig | 5 ++
drivers/xen/xenfs/Makefile | 1 +
drivers/xen/xenfs/super.c | 3 +
drivers/xen/xenfs/xenfs.h | 1 +
drivers/xen/xenfs/xensyms.c | 124 +++++++++++++++++++++++++++++++++++++++
include/xen/interface/platform.h | 19 ++++++
6 files changed, 153 insertions(+)
create mode 100644 drivers/xen/xenfs/xensyms.c
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 38fb36e..b3d1da7 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -240,4 +240,9 @@ config XEN_MCE_LOG
config XEN_HAVE_PVMMU
bool
+config XEN_SYMS
+ bool "Xen symbols"
+ depends on XEN_DOM0 && XENFS
+ default y if KALLSYMS
+
endmenu
diff --git a/drivers/xen/xenfs/Makefile b/drivers/xen/xenfs/Makefile
index b019865..1a83010 100644
--- a/drivers/xen/xenfs/Makefile
+++ b/drivers/xen/xenfs/Makefile
@@ -2,3 +2,4 @@ obj-$(CONFIG_XENFS) += xenfs.o
xenfs-y = super.o
xenfs-$(CONFIG_XEN_DOM0) += xenstored.o
+xenfs-$(CONFIG_XEN_SYMS) += xensyms.o
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 06092e0..8559a71 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -57,6 +57,9 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
{ "privcmd", &xen_privcmd_fops, S_IRUSR|S_IWUSR },
{ "xsd_kva", &xsd_kva_file_ops, S_IRUSR|S_IWUSR},
{ "xsd_port", &xsd_port_file_ops, S_IRUSR|S_IWUSR},
+#ifdef CONFIG_XEN_SYMS
+ { "xensyms", &xensyms_ops, S_IRUSR},
+#endif
{""},
};
diff --git a/drivers/xen/xenfs/xenfs.h b/drivers/xen/xenfs/xenfs.h
index 6b80c77..2c5934e 100644
--- a/drivers/xen/xenfs/xenfs.h
+++ b/drivers/xen/xenfs/xenfs.h
@@ -3,5 +3,6 @@
extern const struct file_operations xsd_kva_file_ops;
extern const struct file_operations xsd_port_file_ops;
+extern const struct file_operations xensyms_ops;
#endif /* _XENFS_XENBUS_H */
diff --git a/drivers/xen/xenfs/xensyms.c b/drivers/xen/xenfs/xensyms.c
new file mode 100644
index 0000000..748948c
--- /dev/null
+++ b/drivers/xen/xenfs/xensyms.c
@@ -0,0 +1,124 @@
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/seq_file.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <xen/interface/platform.h>
+#include <asm/xen/hypercall.h>
+#include <xen/xen-ops.h>
+#include "xenfs.h"
+
+
+#define XEN_KSYM_NAME_LEN 127 /* Hypervisor may have different name length */
+
+
+/* Grab next output page from the hypervisor */
+static int xensyms_next_sym(struct xen_platform_op *op)
+{
+ int ret;
+ uint64_t symnum = op->u.symdata.symnum;
+
+ memset(op->u.symdata.name, 0, XEN_KSYM_NAME_LEN + 1);
+
+ ret = HYPERVISOR_dom0_op(op);
+ if (ret < 0)
+ return ret;
+
+ if (op->u.symdata.symnum == symnum)
+ /* End of symbols */
+ return 1;
+
+ return 0;
+}
+
+static void *xensyms_start(struct seq_file *m, loff_t *pos)
+{
+ struct xen_platform_op *op = (struct xen_platform_op *)m->private;
+
+ if (op->u.symdata.symnum != *pos)
+ op->u.symdata.symnum = *pos;
+
+ if (xensyms_next_sym(op))
+ return NULL;
+
+ return m->private;
+}
+
+static void *xensyms_next(struct seq_file *m, void *p, loff_t *pos)
+{
+ struct xen_platform_op *op = (struct xen_platform_op *)m->private;
+
+ (*pos)++;
+
+ if (op->u.symdata.symnum != *pos)
+ op->u.symdata.symnum = *pos;
+
+ if (xensyms_next_sym(op))
+ return NULL;
+
+ return p;
+}
+
+static int xensyms_show(struct seq_file *m, void *p)
+{
+ struct xen_platform_op *op = (struct xen_platform_op *)m->private;
+
+ seq_printf(m, "%016llx %c %s\n", op->u.symdata.address,
+ op->u.symdata.type, op->u.symdata.name);
+
+ return 0;
+}
+
+static void xensyms_stop(struct seq_file *m, void *p)
+{
+}
+
+static const struct seq_operations xensyms_seq_ops = {
+ .start = xensyms_start,
+ .next = xensyms_next,
+ .show = xensyms_show,
+ .stop = xensyms_stop,
+};
+
+static int xensyms_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *m;
+ struct xen_platform_op *op;
+ char *buf;
+ int ret;
+
+ buf = kzalloc(XEN_KSYM_NAME_LEN + 1, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ret = seq_open_private(file, &xensyms_seq_ops,
+ sizeof(struct xen_platform_op));
+ if (ret)
+ return ret;
+
+ m = file->private_data;
+ op = (struct xen_platform_op *)m->private;
+ set_xen_guest_handle(op->u.symdata.name, buf);
+ op->cmd = XENPF_get_symbol;
+ op->u.symdata.namelen = XEN_KSYM_NAME_LEN + 1;
+
+ return 0;
+}
+
+static int xensyms_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *m = file->private_data;
+ struct xen_platform_op *op = (struct xen_platform_op *)m->private;
+
+ kfree(op->u.symdata.name);
+ return seq_release_private(inode, file);
+}
+
+const struct file_operations xensyms_ops = {
+ .open = xensyms_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = xensyms_release
+};
diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
index f1331e3..792e29a 100644
--- a/include/xen/interface/platform.h
+++ b/include/xen/interface/platform.h
@@ -352,6 +352,24 @@ struct xenpf_core_parking {
};
DEFINE_GUEST_HANDLE_STRUCT(xenpf_core_parking);
+#define XENPF_get_symbol 61
+struct xenpf_symdata {
+ /* IN/OUT variables */
+ uint32_t namelen; /* size of 'name' buffer */
+
+ /* IN/OUT variables */
+ uint32_t symnum; /* IN: Symbol to read */
+ /* OUT: Next available symbol. If same as IN then */
+ /* we reached the end */
+
+ /* OUT variables */
+ char type;
+ uint64_t address;
+ GUEST_HANDLE(char) name;
+};
+DEFINE_GUEST_HANDLE_STRUCT(xenpf_symdata);
+
+
struct xen_platform_op {
uint32_t cmd;
uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -372,6 +390,7 @@ struct xen_platform_op {
struct xenpf_cpu_hotadd cpu_add;
struct xenpf_mem_hotadd mem_add;
struct xenpf_core_parking core_parking;
+ struct xenpf_symdata symdata;
uint8_t pad[128];
} u;
};
--
1.8.1.4
next prev parent reply other threads:[~2014-06-06 17:44 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-06 17:44 [PATCH v2 0/6] xen/PMU: PMU support for Xen PV guests Boris Ostrovsky
2014-06-06 17:44 ` Boris Ostrovsky [this message]
2014-06-10 13:31 ` [PATCH v2 1/6] xen: xensyms support David Vrabel
2014-06-10 14:49 ` Boris Ostrovsky
2014-06-10 14:51 ` Jan Beulich
2014-06-10 15:03 ` Boris Ostrovsky
2014-06-10 15:21 ` Jan Beulich
2014-06-10 15:45 ` Boris Ostrovsky
2014-06-10 16:13 ` Jan Beulich
2014-06-11 9:37 ` Dietmar Hahn
2014-06-06 17:44 ` [PATCH v2 2/6] xen/PMU: Sysfs interface for setting Xen PMU mode Boris Ostrovsky
2014-06-06 20:19 ` Konrad Rzeszutek Wilk
2014-06-10 13:33 ` David Vrabel
2014-06-10 13:48 ` David Vrabel
2014-06-10 14:52 ` Boris Ostrovsky
2014-06-11 10:13 ` Dietmar Hahn
2014-06-11 12:53 ` Boris Ostrovsky
2014-06-11 13:12 ` Dietmar Hahn
2014-06-06 17:44 ` [PATCH v2 3/6] xen/PMU: Initialization code for Xen PMU Boris Ostrovsky
2014-06-06 18:57 ` Andrew Cooper
2014-06-06 19:51 ` Boris Ostrovsky
2014-06-06 17:44 ` [PATCH v2 4/6] xen/PMU: Describe vendor-specific PMU registers Boris Ostrovsky
2014-06-10 14:11 ` David Vrabel
2014-06-10 15:29 ` Boris Ostrovsky
2014-06-06 17:44 ` [PATCH v2 5/6] xen/PMU: Intercept PMU-related MSR and APIC accesses Boris Ostrovsky
2014-06-12 6:56 ` Dietmar Hahn
2014-06-12 14:50 ` Boris Ostrovsky
2014-06-06 17:44 ` [PATCH v2 6/6] xen/PMU: PMU emulation code Boris Ostrovsky
2014-06-10 13:57 ` [PATCH v2 0/6] xen/PMU: PMU support for Xen PV guests David Vrabel
2014-06-10 15:27 ` Boris Ostrovsky
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