cpu-exec: simplify init_delay_params

With the introduction of QEMU_CLOCK_VIRTUAL_RT, the computation of
sc->diff_clk can be simplified nicely:

        qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
        qemu_clock_get_ns(QEMU_CLOCK_REALTIME) +
        cpu_get_clock_offset()

     =  qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
        (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - cpu_get_clock_offset())

     =  qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
        (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + timers_state.cpu_clock_offset)

     =  qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) -
        qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT)

Cc: Sebastian Tanase <sebastian.tanase@openwide.fr>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 0 insertions, 17 deletions

diff --git a/cpus.c b/cpus.c
index 3a5323b1fc..0cdd1d7156 100644
--- a/cpus.c
+++ b/cpus.c
@@ -229,23 +229,6 @@ int64_t cpu_get_clock(void)
     return ti;
 }
 
-/* return the offset between the host clock and virtual CPU clock */
-int64_t cpu_get_clock_offset(void)
-{
-    int64_t ti;
-    unsigned start;
-
-    do {
-        start = seqlock_read_begin(&timers_state.vm_clock_seqlock);
-        ti = timers_state.cpu_clock_offset;
-        if (!timers_state.cpu_ticks_enabled) {
-            ti -= get_clock();
-        }
-    } while (seqlock_read_retry(&timers_state.vm_clock_seqlock, start));
-
-    return -ti;
-}
-
 /* enable cpu_get_ticks()
  * Caller must hold BQL which server as mutex for vm_clock_seqlock.
  */