Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758061Ab0LBTps (ORCPT ); Thu, 2 Dec 2010 14:45:48 -0500 Received: from mx1.redhat.com ([209.132.183.28]:56273 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758041Ab0LBTpp (ORCPT ); Thu, 2 Dec 2010 14:45:45 -0500 Date: Thu, 2 Dec 2010 14:43:24 -0500 From: Rik van Riel To: Rik van Riel Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Avi Kiviti , Srivatsa Vaddagiri , Peter Zijlstra , Ingo Molnar , Anthony Liguori Subject: [RFC PATCH 1/3] kvm: keep track of which task is running a KVM vcpu Message-ID: <20101202144324.4a79263b@annuminas.surriel.com> In-Reply-To: <20101202144129.4357fe00@annuminas.surriel.com> References: <20101202144129.4357fe00@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: 1540 Lines: 52 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 diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 5fbdb55..cb73a73 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -79,6 +79,7 @@ struct kvm_vcpu { #endif int vcpu_id; struct mutex mutex; + struct task_struct *task; int cpu; struct kvm_run *run; unsigned long requests; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 050577a..2bffa47 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -741,6 +741,7 @@ void vcpu_load(struct kvm_vcpu *vcpu) int cpu; mutex_lock(&vcpu->mutex); + vcpu->task = current; cpu = get_cpu(); preempt_notifier_register(&vcpu->preempt_notifier); kvm_arch_vcpu_load(vcpu, cpu); @@ -749,6 +750,7 @@ void vcpu_load(struct kvm_vcpu *vcpu) void vcpu_put(struct kvm_vcpu *vcpu) { + vcpu->task = NULL; preempt_disable(); kvm_arch_vcpu_put(vcpu); preempt_notifier_unregister(&vcpu->preempt_notifier); -- All rights reversed. -- 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/