From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753342AbdJSNjn (ORCPT ); Thu, 19 Oct 2017 09:39:43 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:46803 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753252AbdJSNjl (ORCPT ); Thu, 19 Oct 2017 09:39:41 -0400 From: Joao Martins To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Joao Martins , Paolo Bonzini , Radim Krcmar , Richard Cochran , Marcelo Tosatti , xen-devel , Boris Ostrovsky , Juergen Gross , Andy Lutomirski Subject: [PATCH v7 1/5] ptp_kvm: probe for kvm guest availability Date: Thu, 19 Oct 2017 14:39:14 +0100 Message-Id: <20171019133918.18367-2-joao.m.martins@oracle.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171019133918.18367-1-joao.m.martins@oracle.com> References: <20171019133918.18367-1-joao.m.martins@oracle.com> X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In the event of moving pvclock_pvti_cpu0_va() definition to common pvclock code, this function could return a value on non KVM guests. If user tried to load the module (or have it builtin) it would fail with a GPF on ptp_kvm_init when running on a Xen guest. Therefore, ptp_kvm_init() should check whether it is running in a KVM guest. Signed-off-by: Joao Martins --- New in v7; --- drivers/ptp/ptp_kvm.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/ptp/ptp_kvm.c b/drivers/ptp/ptp_kvm.c index 2b1b212c219e..e04d7b2ecb3a 100644 --- a/drivers/ptp/ptp_kvm.c +++ b/drivers/ptp/ptp_kvm.c @@ -178,6 +178,9 @@ static int __init ptp_kvm_init(void) { long ret; + if (!kvm_para_available()) + return -ENODEV; + clock_pair_gpa = slow_virt_to_phys(&clock_pair); hv_clock = pvclock_pvti_cpu0_va(); -- 2.11.0