From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933675AbcIEQcp (ORCPT ); Mon, 5 Sep 2016 12:32:45 -0400 Received: from fw-tnat.cambridge.arm.com ([217.140.96.140]:28898 "EHLO cam-smtp0.cambridge.arm.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S933578AbcIEQcl (ORCPT ); Mon, 5 Sep 2016 12:32:41 -0400 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: [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 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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); -- 2.8.1