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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>
hifive-unleashed-5.1
Stefano Stabellini 2015-11-23 10:35:12 +00:00 committed by David Vrabel
parent dfd57bc3a5
commit 34e38523d5
1 changed files with 19 additions and 0 deletions
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19
arch/arm/xen/enlighten.c
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@ -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);