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authorStefano Stabellini <stefano.stabellini@eu.citrix.com>2015-11-23 10:35:12 +0000
committerDavid Vrabel <david.vrabel@citrix.com>2015-12-21 14:40:55 +0000
commit34e38523d586ae1e838241d44c8a2e9a1c9e0b43 (patch)
treed9245bb2404b0ef0c4d4e901d7416ce7ab2633c1 /arch/arm/xen
parentdfd57bc3a5664b98eb7b477e8d7bb2591a5198cf (diff)
downloadlinux-34e38523d586ae1e838241d44c8a2e9a1c9e0b43.tar.bz2
xen/arm: account for stolen ticks
Register the runstate_memory_area with the hypervisor. Use pv_time_ops.steal_clock to account for stolen ticks. Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Diffstat (limited to 'arch/arm/xen')
-rw-r--r--arch/arm/xen/enlighten.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index fc7ea529f462..ebbfa64e4add 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -12,6 +12,7 @@
#include <xen/page.h>
#include <xen/interface/sched.h>
#include <xen/xen-ops.h>
+#include <asm/paravirt.h>
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
#include <asm/system_misc.h>
@@ -79,6 +80,19 @@ int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
}
EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
+static unsigned long long xen_stolen_accounting(int cpu)
+{
+ struct vcpu_runstate_info state;
+
+ BUG_ON(cpu != smp_processor_id());
+
+ xen_get_runstate_snapshot(&state);
+
+ WARN_ON(state.state != RUNSTATE_running);
+
+ return state.time[RUNSTATE_runnable] + state.time[RUNSTATE_offline];
+}
+
static void xen_percpu_init(void)
{
struct vcpu_register_vcpu_info info;
@@ -104,6 +118,8 @@ static void xen_percpu_init(void)
BUG_ON(err);
per_cpu(xen_vcpu, cpu) = vcpup;
+ xen_setup_runstate_info(cpu);
+
after_register_vcpu_info:
enable_percpu_irq(xen_events_irq, 0);
put_cpu();
@@ -271,6 +287,9 @@ static int __init xen_guest_init(void)
register_cpu_notifier(&xen_cpu_notifier);
+ pv_time_ops.steal_clock = xen_stolen_accounting;
+ static_key_slow_inc(&paravirt_steal_enabled);
+
return 0;
}
early_initcall(xen_guest_init);