From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755512AbbKCQVx (ORCPT ); Tue, 3 Nov 2015 11:21:53 -0500 Received: from smtp.citrix.com ([66.165.176.89]:40657 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751610AbbKCQVv (ORCPT ); Tue, 3 Nov 2015 11:21:51 -0500 X-IronPort-AV: E=Sophos;i="5.20,239,1444694400"; d="scan'208";a="310041871" From: Stefano Stabellini To: CC: , , , , , , , , , , , Stefano Stabellini Subject: [PATCH v10 5/5] xen/arm: account for stolen ticks Date: Tue, 3 Nov 2015 16:21:04 +0000 Message-ID: <1446567664-11890-5-git-send-email-stefano.stabellini@eu.citrix.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Register the runstate_memory_area with the hypervisor. Use pv_time_ops.steal_clock to account for stolen ticks. Signed-off-by: Stefano Stabellini --- Changes in v4: - don't use paravirt_steal_rq_enabled: we do not support retrieving stolen ticks for vcpus other than one we are running on. Changes in v3: - use BUG_ON and smp_processor_id. --- arch/arm/xen/enlighten.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c index eeeab07..7dd2cc0 100644 --- a/arch/arm/xen/enlighten.c +++ b/arch/arm/xen/enlighten.c @@ -14,7 +14,10 @@ #include #include #include +#include #include +#include +#include #include #include #include @@ -79,6 +82,19 @@ 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; @@ -96,6 +112,8 @@ static void xen_percpu_init(void) BUG_ON(err); per_cpu(xen_vcpu, cpu) = vcpup; + xen_setup_runstate_info(cpu); + enable_percpu_irq(xen_events_irq, 0); put_cpu(); } @@ -259,6 +277,9 @@ 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(¶virt_steal_enabled); + return 0; } early_initcall(xen_guest_init); -- 1.7.10.4