linux-kernel - [PATCH v2 09/21] x86/xen: split xen_cpu

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Date:   Thu,  2 Mar 2017 18:53:45 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     xen-devel@...ts.xenproject.org
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Andrew Jones <drjones@...hat.com>
Subject: [PATCH v2 09/21] x86/xen: split xen_cpu_die()

Split xen_cpu_die() into xen_pv_cpu_die() and xen_hvm_cpu_die() to support
further splitting of smp.c.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 arch/x86/xen/smp.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 6c8a3a5..6c4b415 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -513,10 +513,10 @@ static int xen_cpu_disable(void)
 	return 0;
 }
 
-static void xen_cpu_die(unsigned int cpu)
+static void xen_pv_cpu_die(unsigned int cpu)
 {
-	while (xen_pv_domain() && HYPERVISOR_vcpu_op(VCPUOP_is_up,
-						     xen_vcpu_nr(cpu), NULL)) {
+	while (HYPERVISOR_vcpu_op(VCPUOP_is_up,
+				  xen_vcpu_nr(cpu), NULL)) {
 		__set_current_state(TASK_UNINTERRUPTIBLE);
 		schedule_timeout(HZ/10);
 	}
@@ -529,6 +529,15 @@ static void xen_cpu_die(unsigned int cpu)
 	}
 }
 
+static void xen_hvm_cpu_die(unsigned int cpu)
+{
+	if (common_cpu_die(cpu) == 0) {
+		xen_smp_intr_free(cpu);
+		xen_uninit_lock_cpu(cpu);
+		xen_teardown_timer(cpu);
+	}
+}
+
 static void xen_play_dead(void) /* used only with HOTPLUG_CPU */
 {
 	play_dead_common();
@@ -551,7 +560,12 @@ static int xen_cpu_disable(void)
 	return -ENOSYS;
 }
 
-static void xen_cpu_die(unsigned int cpu)
+static void xen_pv_cpu_die(unsigned int cpu)
+{
+	BUG();
+}
+
+static void xen_hvm_cpu_die(unsigned int cpu)
 {
 	BUG();
 }
@@ -732,7 +746,7 @@ static const struct smp_ops xen_smp_ops __initconst = {
 	.smp_cpus_done = xen_smp_cpus_done,
 
 	.cpu_up = xen_cpu_up,
-	.cpu_die = xen_cpu_die,
+	.cpu_die = xen_pv_cpu_die,
 	.cpu_disable = xen_cpu_disable,
 	.play_dead = xen_play_dead,
 
@@ -761,7 +775,7 @@ void __init xen_hvm_smp_init(void)
 {
 	smp_ops.smp_prepare_cpus = xen_hvm_smp_prepare_cpus;
 	smp_ops.smp_send_reschedule = xen_smp_send_reschedule;
-	smp_ops.cpu_die = xen_cpu_die;
+	smp_ops.cpu_die = xen_hvm_cpu_die;
 	smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
 	smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
 	smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
-- 
2.9.3