xen: xensyms support
Export Xen symbols to dom0 via /proc/xen/xensyms (similar to /proc/kallsyms). Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
parent
cb3eb85013
commit
a11f4f0a4e
|
@ -280,4 +280,12 @@ config XEN_ACPI
|
|||
def_bool y
|
||||
depends on X86 && ACPI
|
||||
|
||||
config XEN_SYMS
|
||||
bool "Xen symbols"
|
||||
depends on X86 && XEN_DOM0 && XENFS
|
||||
default y if KALLSYMS
|
||||
help
|
||||
Exports hypervisor symbols (along with their types and addresses) via
|
||||
/proc/xen/xensyms file, similar to /proc/kallsyms
|
||||
|
||||
endmenu
|
||||
|
|
|
@ -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
|
||||
|
|
|
@ -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
|
||||
{""},
|
||||
};
|
||||
|
||||
|
|
|
@ -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 */
|
||||
|
|
|
@ -0,0 +1,152 @@
|
|||
#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 */
|
||||
|
||||
struct xensyms {
|
||||
struct xen_platform_op op;
|
||||
char *name;
|
||||
uint32_t namelen;
|
||||
};
|
||||
|
||||
/* Grab next output page from the hypervisor */
|
||||
static int xensyms_next_sym(struct xensyms *xs)
|
||||
{
|
||||
int ret;
|
||||
struct xenpf_symdata *symdata = &xs->op.u.symdata;
|
||||
uint64_t symnum;
|
||||
|
||||
memset(xs->name, 0, xs->namelen);
|
||||
symdata->namelen = xs->namelen;
|
||||
|
||||
symnum = symdata->symnum;
|
||||
|
||||
ret = HYPERVISOR_dom0_op(&xs->op);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/*
|
||||
* If hypervisor's symbol didn't fit into the buffer then allocate
|
||||
* a larger buffer and try again.
|
||||
*/
|
||||
if (unlikely(symdata->namelen > xs->namelen)) {
|
||||
kfree(xs->name);
|
||||
|
||||
xs->namelen = symdata->namelen;
|
||||
xs->name = kzalloc(xs->namelen, GFP_KERNEL);
|
||||
if (!xs->name)
|
||||
return -ENOMEM;
|
||||
|
||||
set_xen_guest_handle(symdata->name, xs->name);
|
||||
symdata->symnum--; /* Rewind */
|
||||
|
||||
ret = HYPERVISOR_dom0_op(&xs->op);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
if (symdata->symnum == symnum)
|
||||
/* End of symbols */
|
||||
return 1;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void *xensyms_start(struct seq_file *m, loff_t *pos)
|
||||
{
|
||||
struct xensyms *xs = (struct xensyms *)m->private;
|
||||
|
||||
xs->op.u.symdata.symnum = *pos;
|
||||
|
||||
if (xensyms_next_sym(xs))
|
||||
return NULL;
|
||||
|
||||
return m->private;
|
||||
}
|
||||
|
||||
static void *xensyms_next(struct seq_file *m, void *p, loff_t *pos)
|
||||
{
|
||||
struct xensyms *xs = (struct xensyms *)m->private;
|
||||
|
||||
xs->op.u.symdata.symnum = ++(*pos);
|
||||
|
||||
if (xensyms_next_sym(xs))
|
||||
return NULL;
|
||||
|
||||
return p;
|
||||
}
|
||||
|
||||
static int xensyms_show(struct seq_file *m, void *p)
|
||||
{
|
||||
struct xensyms *xs = (struct xensyms *)m->private;
|
||||
struct xenpf_symdata *symdata = &xs->op.u.symdata;
|
||||
|
||||
seq_printf(m, "%016llx %c %s\n", symdata->address,
|
||||
symdata->type, xs->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 xensyms *xs;
|
||||
int ret;
|
||||
|
||||
ret = seq_open_private(file, &xensyms_seq_ops,
|
||||
sizeof(struct xensyms));
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
m = file->private_data;
|
||||
xs = (struct xensyms *)m->private;
|
||||
|
||||
xs->namelen = XEN_KSYM_NAME_LEN + 1;
|
||||
xs->name = kzalloc(xs->namelen, GFP_KERNEL);
|
||||
if (!xs->name) {
|
||||
seq_release_private(inode, file);
|
||||
return -ENOMEM;
|
||||
}
|
||||
set_xen_guest_handle(xs->op.u.symdata.name, xs->name);
|
||||
xs->op.cmd = XENPF_get_symbol;
|
||||
xs->op.u.symdata.namelen = xs->namelen;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int xensyms_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct seq_file *m = file->private_data;
|
||||
struct xensyms *xs = (struct xensyms *)m->private;
|
||||
|
||||
kfree(xs->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
|
||||
};
|
|
@ -474,6 +474,23 @@ struct xenpf_core_parking {
|
|||
};
|
||||
DEFINE_GUEST_HANDLE_STRUCT(xenpf_core_parking);
|
||||
|
||||
#define XENPF_get_symbol 63
|
||||
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 */
|
||||
GUEST_HANDLE(char) name;
|
||||
uint64_t address;
|
||||
char type;
|
||||
};
|
||||
DEFINE_GUEST_HANDLE_STRUCT(xenpf_symdata);
|
||||
|
||||
struct xen_platform_op {
|
||||
uint32_t cmd;
|
||||
uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
|
||||
|
@ -495,6 +512,7 @@ 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;
|
||||
};
|
||||
|
|
Loading…
Reference in New Issue