[Xen-devel] [PATCH v8 3/5] x86/xen/time: set pvclock flags on xen_time_init()

[Joao Martins <joao.m.martins@xxxxxxxxxx>]

Specifically check for PVCLOCK_TSC_STABLE_BIT and if this bit is set,
then set it too on pvclock flags. This allows Xen clocksource to use it
and thus speeding up xen_clocksource_read() callers (i.e. sched_clock())

Signed-off-by: Joao Martins <joao.m.martins@xxxxxxxxxx>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
Changes since v5:
 * Add Boris RoB

New in v5
---
 arch/x86/xen/time.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 1ecb05db3632..fc0148d3a70d 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -372,6 +372,7 @@ static const struct pv_time_ops xen_time_ops __initconst = {
 
 static void __init xen_time_init(void)
 {
+       struct pvclock_vcpu_time_info *pvti;
        int cpu = smp_processor_id();
        struct timespec tp;
 
@@ -395,6 +396,14 @@ static void __init xen_time_init(void)
 
        setup_force_cpu_cap(X86_FEATURE_TSC);
 
+       /*
+        * We check ahead on the primary time info if this
+        * bit is supported hence speeding up Xen clocksource.
+        */
+       pvti = &__this_cpu_read(xen_vcpu)->time;
+       if (pvti->flags & PVCLOCK_TSC_STABLE_BIT)
+               pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT);
+
        xen_setup_runstate_info(cpu);
        xen_setup_timer(cpu);
        xen_setup_cpu_clockevents();
-- 
2.11.0


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