From patchwork Mon Sep 5 16:31:32 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Punit Agrawal X-Patchwork-Id: 9314325 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 DC9FD60760 for ; Mon, 5 Sep 2016 16:35:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CFF00287C0 for ; Mon, 5 Sep 2016 16:35:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C29C72881A; Mon, 5 Sep 2016 16:35:13 +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=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C8793287C0 for ; Mon, 5 Sep 2016 16:35:12 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bgwpT-00014v-LA; Mon, 05 Sep 2016 16:33:03 +0000 Received: from fw-tnat.cambridge.arm.com ([217.140.96.140] helo=cam-smtp0.cambridge.arm.com) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bgwp1-0000va-9J for linux-arm-kernel@lists.infradead.org; Mon, 05 Sep 2016 16:32:36 +0000 Received: from e105922-lin.cambridge.arm.com (e105922-lin.cambridge.arm.com [10.1.194.52]) by cam-smtp0.cambridge.arm.com (8.13.8/8.13.8) with SMTP id u85GWAWk009123; Mon, 5 Sep 2016 17:32:10 +0100 Received: by e105922-lin.cambridge.arm.com (sSMTP sendmail emulation); Mon, 05 Sep 2016 17:32:10 +0100 From: Punit Agrawal To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org Subject: [RFC v2 PATCH 2/7] KVM: Track the pid of the VM process Date: Mon, 5 Sep 2016 17:31:32 +0100 Message-Id: <1473093097-30932-3-git-send-email-punit.agrawal@arm.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1473093097-30932-1-git-send-email-punit.agrawal@arm.com> References: <1473093097-30932-1-git-send-email-punit.agrawal@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160905_093235_822211_D7FD3ECA X-CRM114-Status: UNSURE ( 9.64 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , Marc Zyngier , Punit Agrawal , Will Deacon , Steven Rostedt , Ingo Molnar , Paolo Bonzini , Christoffer Dall Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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 9c28b4d..7c42c94 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -374,6 +374,7 @@ 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 1950782..ab2535a 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -613,6 +613,7 @@ 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, PIDTYPE_PID); kvm_eventfd_init(kvm); mutex_init(&kvm->lock); mutex_init(&kvm->irq_lock); @@ -712,6 +713,7 @@ 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);