x86: split get_cycles_sync

This patch splits get_cycles_sync() into  __get_cycles_sync(),
and the rdtscll part. Paravirt guests cannot issue rdtscl directly,
as it involves a function call in vdso area.

So, using the __get_cycles_sync() base, we introduce vget_cycles_sync,
which then calls the native version of rdtscll. Ideally, however, a guest
should define its own clocksource, together with a vread function

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 33 insertions, 4 deletions

diff --git a/include/asm-x86/tsc.h b/include/asm-x86/tsc.h
index d7b1c4e7a108..9b7d264897fa 100644
--- a/include/asm-x86/tsc.h
+++ b/include/asm-x86/tsc.h
@@ -33,14 +33,14 @@ static inline cycles_t get_cycles(void)
 }
 
 /* Like get_cycles, but make sure the CPU is synchronized. */
-static __always_inline cycles_t get_cycles_sync(void)
+static __always_inline cycles_t __get_cycles_sync(void)
 {
         unsigned long long ret;
         unsigned eax, edx;
 
         /*
-         * Use RDTSCP if possible; it is guaranteed to be synchronous
-         * and doesn't cause a VMEXIT on Hypervisors
+         * Use RDTSCP if possible; it is guaranteed to be synchronous
+         * and doesn't cause a VMEXIT on Hypervisors
          */
         alternative_io(ASM_NOP3, ".byte 0x0f,0x01,0xf9", X86_FEATURE_RDTSCP,
                        ASM_OUTPUT2("=a" (eax), "=d" (edx)),
@@ -55,11 +55,40 @@ static __always_inline cycles_t get_cycles_sync(void)
          */
         alternative_io("cpuid", ASM_NOP2, X86_FEATURE_SYNC_RDTSC,
                           "=a" (eax), "0" (1) : "ebx","ecx","edx","memory");
-        rdtscll(ret);
 
+        return 0;
+}
+
+static __always_inline cycles_t get_cycles_sync(void)
+{
+        unsigned long long ret;
+        ret = __get_cycles_sync();
+        if (!ret)
+                rdtscll(ret);
         return ret;
 }
 
+#ifdef CONFIG_PARAVIRT
+/*
+ * For paravirt guests, some functionalities are executed through function
+ * pointers in the various pvops structures.
+ * These function pointers exist inside the kernel and can not
+ * be accessed by user space. To avoid this, we make a copy of the
+ * get_cycles_sync (called in kernel) but force the use of native_read_tsc.
+ * Ideally, the guest should set up it's own clock and vread
+ */
+static __always_inline long long vget_cycles_sync(void)
+{
+        unsigned long long ret;
+        ret = __get_cycles_sync();
+        if (!ret)
+                ret = native_read_tsc();
+        return ret;
+}
+#else
+# define vget_cycles_sync() get_cycles_sync()
+#endif
+
 extern void tsc_init(void);
 extern void mark_tsc_unstable(char *reason);
 extern int unsynchronized_tsc(void);