[Xen-devel] [PATCH v2 2/2] x86/time: report correct frequency of Xen PV clocksource

[Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>]

The value of the counter represents the number of nanoseconds
since host boot. That means the correct frequency is always 1GHz.

This inconsistency caused time to go slower in PV shim on most
platforms.

Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
---
 xen/arch/x86/time.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/time.c b/xen/arch/x86/time.c
index 7e7a62e..26f9bad 100644
--- a/xen/arch/x86/time.c
+++ b/xen/arch/x86/time.c
@@ -587,9 +587,7 @@ static int64_t __init init_xen_timer(struct 
platform_timesource *pts)
     if ( !xen_guest )
         return 0;
 
-    pts->frequency = xen_timer_cpu_frequency();
-
-    return pts->frequency;
+    return xen_timer_cpu_frequency();
 }
 
 static always_inline uint64_t read_cycle(const struct vcpu_time_info *info,
@@ -643,6 +641,7 @@ static struct platform_timesource __initdata plt_xen_timer =
 {
     .id = "xen",
     .name = "XEN PV CLOCK",
+    .frequency = 1000000000ULL,
     .read_counter = read_xen_timer,
     .init = init_xen_timer,
     .resume = resume_xen_timer,
-- 
2.7.4


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