x86_64: Add vDSO for x86-64 with gettimeofday/clock_gettime/getcpu
This implements new vDSO for x86-64. The concept is similar
to the existing vDSOs on i386 and PPC. x86-64 has had static
vsyscalls before, but these are not flexible enough anymore.
A vDSO is a ELF shared library supplied by the kernel that is mapped into
user address space. The vDSO mapping is randomized for each process
for security reasons.
Doing this was needed for clock_gettime, because clock_gettime
always needs a syscall fallback and having one at a fixed
address would have made buffer overflow exploits too easy to write.
The vdso can be disabled with vdso=0
It currently includes a new gettimeofday implemention and optimized
clock_gettime(). The gettimeofday implementation is slightly faster
than the one in the old vsyscall. clock_gettime is significantly faster
than the syscall for CLOCK_MONOTONIC and CLOCK_REALTIME.
The new calls are generally faster than the old vsyscall.
Advantages over the old x86-64 vsyscalls:
- Extensible
- Randomized
- Cleaner
- Easier to virtualize (the old static address range previously causes
overhead e.g. for Xen because it has to create special page tables for it)
Weak points:
- glibc support still to be written
The VM interface is partly based on Ingo Molnar's i386 version.
Includes compile fix from Joachim Deguara
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/asm-x86_64/vgtod.h b/include/asm-x86_64/vgtod.h
new file mode 100644
index 0000000..3301f09
--- /dev/null
+++ b/include/asm-x86_64/vgtod.h
@@ -0,0 +1,29 @@
+#ifndef _ASM_VGTOD_H
+#define _ASM_VGTOD_H 1
+
+#include <asm/vsyscall.h>
+#include <linux/clocksource.h>
+
+struct vsyscall_gtod_data {
+ seqlock_t lock;
+
+ /* open coded 'struct timespec' */
+ time_t wall_time_sec;
+ u32 wall_time_nsec;
+
+ int sysctl_enabled;
+ struct timezone sys_tz;
+ struct { /* extract of a clocksource struct */
+ cycle_t (*vread)(void);
+ cycle_t cycle_last;
+ cycle_t mask;
+ u32 mult;
+ u32 shift;
+ } clock;
+ struct timespec wall_to_monotonic;
+};
+extern struct vsyscall_gtod_data __vsyscall_gtod_data
+__section_vsyscall_gtod_data;
+extern struct vsyscall_gtod_data vsyscall_gtod_data;
+
+#endif