Build cpu_hotplug for ARM and ARM64 guests.
Rename arch_(un)register_cpu to xen_(un)register_cpu and provide an
empty implementation on ARM and ARM64. On x86 just call
arch_(un)register_cpu as we are already doing.
Initialize cpu_hotplug on ARM.
Signed-off-by: Stefano Stabellini <stefano.stabell...@eu.citrix.com>
Reviewed-by: Julien Grall <julien.gr...@citrix.com>
---
Changes in v2:
- don't initialize if not a xen_domain() on arm
- protect xen_arch_(un)register_cpu with ifdef CONFIG_HOTPLUG_CPU on arm
---
arch/arm/include/asm/xen/hypervisor.h | 10 ++++++++++
arch/x86/include/asm/xen/hypervisor.h | 5 +++++
arch/x86/xen/enlighten.c | 15 +++++++++++++++
drivers/xen/Makefile | 2 --
drivers/xen/cpu_hotplug.c | 8 ++++++--
5 files changed, 36 insertions(+), 4 deletions(-)
diff --git a/arch/arm/include/asm/xen/hypervisor.h
b/arch/arm/include/asm/xen/hypervisor.h
index 04ff8e7..9525151 100644
--- a/arch/arm/include/asm/xen/hypervisor.h
+++ b/arch/arm/include/asm/xen/hypervisor.h
@@ -26,4 +26,14 @@ void __init xen_early_init(void);
static inline void xen_early_init(void) { return; }
#endif
+#ifdef CONFIG_HOTPLUG_CPU
+static inline void xen_arch_register_cpu(int num)
+{
+}
+
+static inline void xen_arch_unregister_cpu(int num)
+{
+}
+#endif
+
#endif /* _ASM_ARM_XEN_HYPERVISOR_H */
diff --git a/arch/x86/include/asm/xen/hypervisor.h
b/arch/x86/include/asm/xen/hypervisor.h
index d866959..8b2d4be 100644
--- a/arch/x86/include/asm/xen/hypervisor.h
+++ b/arch/x86/include/asm/xen/hypervisor.h
@@ -57,4 +57,9 @@ static inline bool xen_x2apic_para_available(void)
}
#endif
+#ifdef CONFIG_HOTPLUG_CPU
+void xen_arch_register_cpu(int num);
+void xen_arch_unregister_cpu(int num);
+#endif
+
#endif /* _ASM_X86_XEN_HYPERVISOR_H */
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 11d6fb4..ba62d8e 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -71,6 +71,7 @@
#include <asm/mwait.h>
#include <asm/pci_x86.h>
#include <asm/pat.h>
+#include <asm/cpu.h>
#ifdef CONFIG_ACPI
#include <linux/acpi.h>
@@ -1868,3 +1869,17 @@ const struct hypervisor_x86 x86_hyper_xen = {
.set_cpu_features = xen_set_cpu_features,
};
EXPORT_SYMBOL(x86_hyper_xen);
+
+#ifdef CONFIG_HOTPLUG_CPU
+void xen_arch_register_cpu(int num)
+{
+ arch_register_cpu(num);
+}
+EXPORT_SYMBOL(xen_arch_register_cpu);
+
+void xen_arch_unregister_cpu(int num)
+{
+ arch_unregister_cpu(num);
+}
+EXPORT_SYMBOL(xen_arch_unregister_cpu);
+#endif
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index e293bc5..aa8a7f7 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -1,6 +1,4 @@
-ifeq ($(filter y, $(CONFIG_ARM) $(CONFIG_ARM64)),)
obj-$(CONFIG_HOTPLUG_CPU) += cpu_hotplug.o
-endif
obj-$(CONFIG_X86) += fallback.o
obj-y += grant-table.o features.o balloon.o manage.o preempt.o
obj-y += events/
diff --git a/drivers/xen/cpu_hotplug.c b/drivers/xen/cpu_hotplug.c
index cc6513a..43de1f5 100644
--- a/drivers/xen/cpu_hotplug.c
+++ b/drivers/xen/cpu_hotplug.c
@@ -11,7 +11,7 @@
static void enable_hotplug_cpu(int cpu)
{
if (!cpu_present(cpu))
- arch_register_cpu(cpu);
+ xen_arch_register_cpu(cpu);
set_cpu_present(cpu, true);
}
@@ -19,7 +19,7 @@ static void enable_hotplug_cpu(int cpu)
static void disable_hotplug_cpu(int cpu)
{
if (cpu_present(cpu))
- arch_unregister_cpu(cpu);
+ xen_arch_unregister_cpu(cpu);
set_cpu_present(cpu, false);
}
@@ -102,7 +102,11 @@ static int __init setup_vcpu_hotplug_event(void)
static struct notifier_block xsn_cpu = {
.notifier_call = setup_cpu_watcher };
+#ifdef CONFIG_X86
if (!xen_pv_domain())
+#else
+ if (!xen_domain())
+#endif
return -ENODEV;
register_xenstore_notifier(&xsn_cpu);
--
1.7.10.4
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