From patchwork Wed Oct 26 17:41:42 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Punit Agrawal X-Patchwork-Id: 9397915 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 85A2760236 for ; Wed, 26 Oct 2016 17:42:57 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0A8D1289B9 for ; Wed, 26 Oct 2016 17:42:57 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F39E629BCC; Wed, 26 Oct 2016 17:42:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2062329BAF for ; Wed, 26 Oct 2016 17:42:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932716AbcJZRmd (ORCPT ); Wed, 26 Oct 2016 13:42:33 -0400 Received: from foss.arm.com ([217.140.101.70]:48420 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755866AbcJZRmV (ORCPT ); Wed, 26 Oct 2016 13:42:21 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 116181516; Wed, 26 Oct 2016 10:42:21 -0700 (PDT) Received: from localhost (e105922-lin.cambridge.arm.com [10.1.195.25]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D67E73F487; Wed, 26 Oct 2016 10:42:20 -0700 (PDT) From: Punit Agrawal To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Cc: Punit Agrawal , Christoffer Dall , Marc Zyngier , Steven Rostedt , Ingo Molnar , Will Deacon , Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Subject: [PATCH v2 2/8] KVM: Track the pid of the VM process Date: Wed, 26 Oct 2016 18:41:42 +0100 Message-Id: <20161026174148.17172-3-punit.agrawal@arm.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20161026174148.17172-1-punit.agrawal@arm.com> References: <20161026174148.17172-1-punit.agrawal@arm.com> MIME-Version: 1.0 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Userspace tools such as perf can be used to profile individual processes. Track the PID of the virtual machine process to match profiling requests targeted at it. This can be used to take appropriate action to enable the requested profiling operations for the VMs of interest. Signed-off-by: Punit Agrawal Cc: Paolo Bonzini Cc: "Radim Krčmář" Cc: Christoffer Dall Cc: Marc Zyngier --- include/linux/kvm_host.h | 1 + virt/kvm/kvm_main.c | 2 ++ 2 files changed, 3 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 01c0b9c..4caff20 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -375,6 +375,7 @@ struct kvm_memslots { struct kvm { spinlock_t mmu_lock; struct mutex slots_lock; + struct pid *pid; struct mm_struct *mm; /* userspace tied to this vm */ struct kvm_memslots *memslots[KVM_ADDRESS_SPACE_NUM]; struct srcu_struct srcu; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 28510e7..ed3823c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -615,6 +615,7 @@ static struct kvm *kvm_create_vm(unsigned long type) spin_lock_init(&kvm->mmu_lock); atomic_inc(¤t->mm->mm_count); kvm->mm = current->mm; + kvm->pid = get_task_pid(current->group_leader, PIDTYPE_PID); kvm_eventfd_init(kvm); mutex_init(&kvm->lock); mutex_init(&kvm->irq_lock); @@ -714,6 +715,7 @@ static void kvm_destroy_vm(struct kvm *kvm) int i; struct mm_struct *mm = kvm->mm; + put_pid(kvm->pid); kvm_destroy_vm_debugfs(kvm); kvm_arch_sync_events(kvm); spin_lock(&kvm_lock);