linux-kernel - [PATCH 1/2] x86: paravirt: add local_apic_timer_interrupt to pv

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Date:   Wed,  7 Sep 2016 00:29:58 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     rkrcmar@...hat.com, dmatlack@...gle.com, luto@...nel.org,
        peterhornyack@...gle.com, x86@...nel.org
Subject: [PATCH 1/2] x86: paravirt: add local_apic_timer_interrupt to pv_ops

local_apic_timer_interrupt refers to a static clockevent in
apic.c.  Paravirtualized implementations need to check a different
clockevent, so allow customizing the guts of the APIC timer interrupt.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/include/asm/apic.h           | 1 +
 arch/x86/include/asm/paravirt.h       | 5 +++++
 arch/x86/include/asm/paravirt_types.h | 1 +
 arch/x86/kernel/apic/apic.c           | 2 +-
 arch/x86/kernel/paravirt.c            | 1 +
 5 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 124357773ffa..f6e0bad1cde2 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -109,6 +109,7 @@ extern void native_apic_wait_icr_idle(void);
 extern u32 native_safe_apic_wait_icr_idle(void);
 extern void native_apic_icr_write(u32 low, u32 id);
 extern u64 native_apic_icr_read(void);
+extern void native_local_apic_timer_interrupt(void);
 
 static inline bool apic_is_x2apic_enabled(void)
 {
diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index 2970d22d7766..71ec3a73745f 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -197,6 +197,11 @@ static inline u64 paravirt_steal_clock(int cpu)
 	return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
 }
 
+static inline void local_apic_timer_interrupt(void)
+{
+	PVOP_VCALL0(pv_time_ops.local_apic_timer_interrupt);
+}
+
 static inline unsigned long long paravirt_read_pmc(int counter)
 {
 	return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index 7fa9e7740ba3..ea1f27400098 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -96,6 +96,7 @@ struct pv_lazy_ops {
 struct pv_time_ops {
 	unsigned long long (*sched_clock)(void);
 	unsigned long long (*steal_clock)(int cpu);
+	void (*local_apic_timer_interrupt)(void);
 };
 
 struct pv_cpu_ops {
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index cea4fc19e844..5b63bec7d0af 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -902,7 +902,7 @@ void setup_secondary_APIC_clock(void)
 /*
  * The guts of the apic timer interrupt
  */
-static void local_apic_timer_interrupt(void)
+void native_local_apic_timer_interrupt(void)
 {
 	int cpu = smp_processor_id();
 	struct clock_event_device *evt = &per_cpu(lapic_events, cpu);
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index ad5bc9578a73..0e056271d714 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -310,6 +310,7 @@ struct pv_init_ops pv_init_ops = {
 struct pv_time_ops pv_time_ops = {
 	.sched_clock = native_sched_clock,
 	.steal_clock = native_steal_clock,
+	.local_apic_timer_interrupt = native_local_apic_timer_interrupt,
 };
 
 __visible struct pv_irq_ops pv_irq_ops = {
-- 
1.8.3.1