From patchwork Wed Jul 7 04:13:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexey Kardashevskiy X-Patchwork-Id: 1501567 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=kvm-ppc-owner@vger.kernel.org; receiver=) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4GKR8T2p2yz9t1r for ; Wed, 7 Jul 2021 14:22:01 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229466AbhGGEYi (ORCPT ); Wed, 7 Jul 2021 00:24:38 -0400 Received: from ozlabs.ru ([107.174.27.60]:50696 "EHLO ozlabs.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229460AbhGGEYi (ORCPT ); Wed, 7 Jul 2021 00:24:38 -0400 X-Greylist: delayed 487 seconds by postgrey-1.27 at vger.kernel.org; Wed, 07 Jul 2021 00:24:38 EDT Received: from fstn1-p1.ozlabs.ibm.com. (localhost [IPv6:::1]) by ozlabs.ru (Postfix) with ESMTP id 8F9D3AE80026; Wed, 7 Jul 2021 00:13:47 -0400 (EDT) From: Alexey Kardashevskiy To: linuxppc-dev@lists.ozlabs.org Cc: Alexey Kardashevskiy , linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org, Paul Mackerras Subject: [PATCH kernel] KVM: PPC: Book3S HV: Make unique debugfs nodename Date: Wed, 7 Jul 2021 14:13:44 +1000 Message-Id: <20210707041344.3803554-1-aik@ozlabs.ru> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm-ppc@vger.kernel.org Currently it is vm-$currentpid which works as long as there is just one VM per the userspace (99.99% cases) but produces a bunch of "debugfs: Directory 'vm16679' with parent 'kvm' already present!" when syzkaller (syscall fuzzer) is running so only one VM is present in the debugfs for a given process. This changes the debugfs node to include the LPID which alone should be system wide unique. This leaves the existing pid for the convenience of matching the VM's debugfs with the running userspace process (QEMU). Signed-off-by: Alexey Kardashevskiy Reviewed-by: Fabiano Rosas --- arch/powerpc/kvm/book3s_hv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 1d1fcc290fca..0223ddc0eed0 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -5227,7 +5227,7 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm) /* * Create a debugfs directory for the VM */ - snprintf(buf, sizeof(buf), "vm%d", current->pid); + snprintf(buf, sizeof(buf), "vm%d-lp%ld", current->pid, lpid); kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir); kvmppc_mmu_debugfs_init(kvm); if (radix_enabled())