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xen/arm: Enable cpu_hotplug.c

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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.stabellini@eu.citrix.com>
Reviewed-by: Julien Grall <julien.grall@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Stefano Stabellini 2015-10-22 16:20:46 +00:00 committed by David Vrabel
parent 89bf4b4e4a
commit a314e3eb84
5 changed files with 36 additions and 4 deletions
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10
arch/arm/include/asm/xen/hypervisor.h
View File

@ -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 */

5
arch/x86/include/asm/xen/hypervisor.h
View File

@ -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 */

15
arch/x86/xen/enlighten.c
View File

@ -75,6 +75,7 @@
#include <asm/mwait.h>
#include <asm/pci_x86.h>
#include <asm/pat.h>
#include <asm/cpu.h>
#ifdef CONFIG_ACPI
#include <linux/acpi.h>
@ -1899,3 +1900,17 @@ 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

2
drivers/xen/Makefile
View File

@ -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/

8
drivers/xen/cpu_hotplug.c
View File

@ -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);