From patchwork Tue Aug 16 10:45:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Punit Agrawal X-Patchwork-Id: 9283333 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 16EF2607FD for ; Tue, 16 Aug 2016 10:49:20 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 07412285DF for ; Tue, 16 Aug 2016 10:49:20 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EFECF285E6; Tue, 16 Aug 2016 10:49:19 +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 89340285DF for ; Tue, 16 Aug 2016 10:49:19 +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 1bZbuT-0001BF-A8; Tue, 16 Aug 2016 10:47:53 +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 1bZbt7-0000HJ-K3 for linux-arm-kernel@lists.infradead.org; Tue, 16 Aug 2016 10:46:33 +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 u7GAk5q7031909; Tue, 16 Aug 2016 11:46:05 +0100 Received: by e105922-lin.cambridge.arm.com (sSMTP sendmail emulation); Tue, 16 Aug 2016 11:46:05 +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 PATCH 2/7] KVM: Track the pid of the VM process Date: Tue, 16 Aug 2016 11:45:07 +0100 Message-Id: <1471344312-26685-3-git-send-email-punit.agrawal@arm.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1471344312-26685-1-git-send-email-punit.agrawal@arm.com> References: <1471344312-26685-1-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-20160816_034630_434187_66E15F94 X-CRM114-Status: UNSURE ( 9.14 ) 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);