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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 01/16] common/symbols: Export hypervisor symbols to PV guest
Export Xen's symbols as {<address><type><name>} triplet via new XENPF_get_symbol
hypercall
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
xen/arch/x86/platform_hypercall.c | 18 ++++++++++++
xen/arch/x86/x86_64/platform_hypercall.c | 2 ++
xen/common/symbols.c | 50 +++++++++++++++++++++++++++++++-
xen/common/vsprintf.c | 2 +-
xen/include/public/platform.h | 19 ++++++++++++
xen/include/xen/symbols.h | 7 +++--
6 files changed, 94 insertions(+), 4 deletions(-)
diff --git a/xen/arch/x86/platform_hypercall.c
b/xen/arch/x86/platform_hypercall.c
index 2162811..cdb6886 100644
--- a/xen/arch/x86/platform_hypercall.c
+++ b/xen/arch/x86/platform_hypercall.c
@@ -23,6 +23,7 @@
#include <xen/cpu.h>
#include <xen/pmstat.h>
#include <xen/irq.h>
+#include <xen/symbols.h>
#include <asm/current.h>
#include <public/platform.h>
#include <acpi/cpufreq/processor_perf.h>
@@ -601,6 +602,23 @@ ret_t
do_platform_op(XEN_GUEST_HANDLE_PARAM(xen_platform_op_t) u_xenpf_op)
}
break;
+ case XENPF_get_symbol:
+ {
+ char name[XEN_KSYM_NAME_LEN + 1];
+ XEN_GUEST_HANDLE_64(char) nameh;
+
+ guest_from_compat_handle(nameh, op->u.symdata.u.name);
+
+ ret = xensyms_read(&op->u.symdata.symnum, &op->u.symdata.type,
+ &op->u.symdata.address, name);
+
+ if ( !ret && copy_to_guest(nameh, name, XEN_KSYM_NAME_LEN + 1) )
+ ret = -EFAULT;
+ if ( !ret && __copy_field_to_guest(u_xenpf_op, op, u.symdata) )
+ ret = -EFAULT;
+ }
+ break;
+
default:
ret = -ENOSYS;
break;
diff --git a/xen/arch/x86/x86_64/platform_hypercall.c
b/xen/arch/x86/x86_64/platform_hypercall.c
index b6f380e..795837f 100644
--- a/xen/arch/x86/x86_64/platform_hypercall.c
+++ b/xen/arch/x86/x86_64/platform_hypercall.c
@@ -32,6 +32,8 @@ CHECK_pf_pcpu_version;
CHECK_pf_enter_acpi_sleep;
#undef xen_pf_enter_acpi_sleep
+#define xenpf_symdata compat_pf_symdata
+
#define COMPAT
#define _XEN_GUEST_HANDLE(t) XEN_GUEST_HANDLE(t)
#define _XEN_GUEST_HANDLE_PARAM(t) XEN_GUEST_HANDLE_PARAM(t)
diff --git a/xen/common/symbols.c b/xen/common/symbols.c
index 45941e1..98f9534 100644
--- a/xen/common/symbols.c
+++ b/xen/common/symbols.c
@@ -17,6 +17,8 @@
#include <xen/lib.h>
#include <xen/string.h>
#include <xen/spinlock.h>
+#include <public/platform.h>
+#include <xen/guest_access.h>
#ifdef SYMBOLS_ORIGIN
extern const unsigned int symbols_offsets[1];
@@ -107,7 +109,7 @@ const char *symbols_lookup(unsigned long addr,
unsigned long i, low, high, mid;
unsigned long symbol_end = 0;
- namebuf[KSYM_NAME_LEN] = 0;
+ namebuf[XEN_KSYM_NAME_LEN] = 0;
namebuf[0] = 0;
if (!is_active_kernel_text(addr))
@@ -148,3 +150,49 @@ const char *symbols_lookup(unsigned long addr,
*offset = addr - symbols_address(low);
return namebuf;
}
+
+/*
+ * Get symbol type information. This is encoded as a single char at the
+ * beginning of the symbol name.
+ */
+static char symbols_get_symbol_type(unsigned int off)
+{
+ /*
+ * Get just the first code, look it up in the token table,
+ * and return the first char from this token.
+ */
+ return symbols_token_table[symbols_token_index[symbols_names[off + 1]]];
+}
+
+/*
+ * Symbols are most likely accessed sequentially so we remember position from
+ * previous read. This can help us avoid the extra call to get_symbol_offset().
+ */
+static uint64_t next_symbol, next_offset;
+static DEFINE_SPINLOCK(symbols_mutex);
+
+int xensyms_read(uint32_t *symnum, uint32_t *type, uint64_t *address, char
*name)
+{
+ if ( *symnum > symbols_num_syms )
+ return -ERANGE;
+ if ( *symnum == symbols_num_syms )
+ return 0;
+
+ spin_lock(&symbols_mutex);
+
+ if ( *symnum == 0 )
+ next_offset = next_symbol = 0;
+ if ( next_symbol != *symnum )
+ /* Non-sequential access */
+ next_offset = get_symbol_offset(*symnum);
+
+ *type = symbols_get_symbol_type(next_offset);
+ next_offset = symbols_expand_symbol(next_offset, name);
+ *address = symbols_offsets[*symnum] + SYMBOLS_ORIGIN;
+
+ next_symbol = ++(*symnum);
+
+ spin_unlock(&symbols_mutex);
+
+ return 0;
+}
diff --git a/xen/common/vsprintf.c b/xen/common/vsprintf.c
index 1a6198e..c5ae187 100644
--- a/xen/common/vsprintf.c
+++ b/xen/common/vsprintf.c
@@ -275,7 +275,7 @@ static char *pointer(char *str, char *end, const char
**fmt_ptr,
case 'S': /* Symbol name unconditionally with offset and size */
{
unsigned long sym_size, sym_offset;
- char namebuf[KSYM_NAME_LEN+1];
+ char namebuf[XEN_KSYM_NAME_LEN+1];
/* Advance parents fmt string, as we have consumed 's' or 'S' */
++*fmt_ptr;
diff --git a/xen/include/public/platform.h b/xen/include/public/platform.h
index 4341f54..ba9da49 100644
--- a/xen/include/public/platform.h
+++ b/xen/include/public/platform.h
@@ -527,6 +527,24 @@ struct xenpf_core_parking {
typedef struct xenpf_core_parking xenpf_core_parking_t;
DEFINE_XEN_GUEST_HANDLE(xenpf_core_parking_t);
+#define XENPF_get_symbol 61
+#define XEN_KSYM_NAME_LEN 127
+struct xenpf_symdata {
+ /* IN variables */
+ uint32_t symnum;
+
+ /* OUT variables */
+ uint32_t type;
+ uint64_t address;
+
+ union {
+ XEN_GUEST_HANDLE(char) name;
+ uint64_t pad;
+ } u;
+};
+typedef struct xenpf_symdata xenpf_symdata_t;
+DEFINE_XEN_GUEST_HANDLE(xenpf_symdata_t);
+
/*
* ` enum neg_errnoval
* ` HYPERVISOR_platform_op(const struct xen_platform_op*);
@@ -553,6 +571,7 @@ 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;
};
diff --git a/xen/include/xen/symbols.h b/xen/include/xen/symbols.h
index 87cd77d..adbf91d 100644
--- a/xen/include/xen/symbols.h
+++ b/xen/include/xen/symbols.h
@@ -2,8 +2,8 @@
#define _XEN_SYMBOLS_H
#include <xen/types.h>
-
-#define KSYM_NAME_LEN 127
+#include <public/xen.h>
+#include <public/platform.h>
/* Lookup an address. */
const char *symbols_lookup(unsigned long addr,
@@ -11,4 +11,7 @@ const char *symbols_lookup(unsigned long addr,
unsigned long *offset,
char *namebuf);
+extern int xensyms_read(uint32_t *symnum, uint32_t *type,
+ uint64_t *address, char *name);
+
#endif /*_XEN_SYMBOLS_H*/
--
1.8.1.4
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