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From:   Pavel Tatashin <pasha.tatashin@oracle.com>
To:     steven.sistare@oracle.com, daniel.m.jordan@oracle.com,
        linux@armlinux.org.uk, schwidefsky@de.ibm.com,
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Subject: [PATCH v10 6/7] x86/paravirt: add active_sched_clock to pv_time_ops
Date:   Fri, 15 Jun 2018 13:42:03 -0400
Message-Id: <20180615174204.30581-7-pasha.tatashin@oracle.com>
In-Reply-To: <20180615174204.30581-1-pasha.tatashin@oracle.com>
References: <20180615174204.30581-1-pasha.tatashin@oracle.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Early boot clock might differ from the clock that is used later on,
therefore add a new field to pv_time_ops, that shows currently active
clock. If platform supports early boot clock, this field will be changed
to use that clock early in boot, and later will be replaced with the
permanent clock.

Signed-off-by: Pavel Tatashin <pasha.tatashin@oracle.com>
---
 arch/x86/include/asm/paravirt_types.h | 1 +
 arch/x86/kernel/paravirt.c            | 1 +
 arch/x86/xen/time.c                   | 7 ++++---
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 180bc0bff0fb..d555b66c5bbb 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -99,6 +99,7 @@ struct pv_lazy_ops {
 struct pv_time_ops {
 	unsigned long long (*sched_clock)(void);
 	unsigned long long (*steal_clock)(int cpu);
+	unsigned long long (*active_sched_clock)(void);
 } __no_randomize_layout;
 
 struct pv_cpu_ops {
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index 99dc79e76bdc..5bfdb72f152f 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -320,6 +320,7 @@ struct pv_init_ops pv_init_ops = {
 struct pv_time_ops pv_time_ops = {
 	.sched_clock = native_sched_clock,
 	.steal_clock = native_steal_clock,
+	.active_sched_clock = native_sched_clock,
 };
 
 __visible struct pv_irq_ops pv_irq_ops = {
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index e0f1bcf01d63..29b07020c827 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -505,8 +505,8 @@ static void __init xen_time_init(void)
 
 void __ref xen_init_time_ops(void)
 {
-	pv_time_ops = xen_time_ops;
-
+	pv_time_ops.sched_clock = xen_time_ops.sched_clock;
+	pv_time_ops.steal_clock = xen_time_ops.steal_clock;
 	x86_init.timers.timer_init = xen_time_init;
 	x86_init.timers.setup_percpu_clockev = x86_init_noop;
 	x86_cpuinit.setup_percpu_clockev = x86_init_noop;
@@ -547,7 +547,8 @@ void __init xen_hvm_init_time_ops(void)
 		return;
 	}
 
-	pv_time_ops = xen_time_ops;
+	pv_time_ops.sched_clock = xen_time_ops.sched_clock;
+	pv_time_ops.steal_clock = xen_time_ops.steal_clock;
 	x86_init.timers.setup_percpu_clockev = xen_time_init;
 	x86_cpuinit.setup_percpu_clockev = xen_hvm_setup_cpu_clockevents;
 
-- 
2.17.1