[PATCH] KVM: x86: fix kvmclock breakage from timers branch merge

[Paolo Bonzini]

Commit cbcf2dd3b3d4 (x86: kvm: Make kvm_get_time_and_clockread() nanoseconds
based, 2014-07-16) forgot to add tk->xtime_sec, thus breaking kvmclock on
hosts that have a reliable TSC.  Add it back; and since the field boot_ns
is not anymore related to the host boot-based clock, rename boot_ns->nsec_base
and the existing nsec_base->snsec_base.

Cc: Thomas Gleixner <t...@linutronix.de>
Cc: John Stultz <john.stu...@linaro.org>
Reported-by: Chris J Arges <chris.j.ar...@canonical.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 arch/x86/kvm/x86.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8f1e22d3b286..92493e10937c 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1020,8 +1020,8 @@ struct pvclock_gtod_data {
                u32     shift;
        } clock;
 
-       u64             boot_ns;
        u64             nsec_base;
+       u64             snsec_base;
 };
 
 static struct pvclock_gtod_data pvclock_gtod_data;
@@ -1042,8 +1042,9 @@ static void update_pvclock_gtod(struct timekeeper *tk)
        vdata->clock.mult               = tk->tkr.mult;
        vdata->clock.shift              = tk->tkr.shift;
 
-       vdata->boot_ns                  = boot_ns;
-       vdata->nsec_base                = tk->tkr.xtime_nsec;
+       vdata->nsec_base                = tk->xtime_sec * (u64)NSEC_PER_SEC
+                                       + boot_ns;
+       vdata->snsec_base               = tk->tkr.xtime_nsec;
 
        write_seqcount_end(&vdata->seq);
 }
@@ -1413,10 +1414,10 @@ static int do_monotonic_boot(s64 *t, cycle_t *cycle_now)
        do {
                seq = read_seqcount_begin(&gtod->seq);
                mode = gtod->clock.vclock_mode;
-               ns = gtod->nsec_base;
+               ns = gtod->snsec_base;
                ns += vgettsc(cycle_now);
                ns >>= gtod->clock.shift;
-               ns += gtod->boot_ns;
+               ns += gtod->nsec_base;
        } while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
        *t = ns;
 
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html