Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757244Ab0LNDsp (ORCPT ); Mon, 13 Dec 2010 22:48:45 -0500 Received: from mx1.redhat.com ([209.132.183.28]:12250 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753074Ab0LNDso (ORCPT ); Mon, 13 Dec 2010 22:48:44 -0500 Date: Mon, 13 Dec 2010 22:45:58 -0500 From: Rik van Riel To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Avi Kiviti , Srivatsa Vaddagiri , Peter Zijlstra , Mike Galbraith , Chris Wright Subject: [RFC -v2 PATCH 1/3] kvm: keep track of which task is running a KVM vcpu Message-ID: <20101213224558.1074e7fd@annuminas.surriel.com> In-Reply-To: <20101213224434.7495edb2@annuminas.surriel.com> References: <20101213224434.7495edb2@annuminas.surriel.com> Organization: Red Hat, Inc. Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1639 Lines: 53 Keep track of which task is running a KVM vcpu. This helps us figure out later what task to wake up if we want to boost a vcpu that got preempted. Unfortunately there are no guarantees that the same task always keeps the same vcpu, so we can only track the task across a single "run" of the vcpu. Signed-off-by: Rik van Riel --- - move vcpu->task manipulation as suggested by Chris Wright include/linux/kvm_host.h | 1 + virt/kvm/kvm_main.c | 2 ++ 2 files changed, 3 insertions(+), 0 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index a055742..180085b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -81,6 +81,7 @@ struct kvm_vcpu { #endif int vcpu_id; struct mutex mutex; + struct task_struct *task; int cpu; atomic_t guest_mode; struct kvm_run *run; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 5225052..c95bad1 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -2248,6 +2248,7 @@ static void kvm_sched_in(struct preempt_notifier *pn, int cpu) { struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); + vcpu->task = NULL; kvm_arch_vcpu_load(vcpu, cpu); } @@ -2256,6 +2257,7 @@ static void kvm_sched_out(struct preempt_notifier *pn, { struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn); + vcpu->task = current; kvm_arch_vcpu_put(vcpu); } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/