From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 32D60C04AB4 for ; Tue, 14 May 2019 15:26:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0652F20644 for ; Tue, 14 May 2019 15:26:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726290AbfENP0q (ORCPT ); Tue, 14 May 2019 11:26:46 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:41506 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725980AbfENP0p (ORCPT ); Tue, 14 May 2019 11:26:45 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x4EFKJsg121005 for ; Tue, 14 May 2019 11:26:44 -0400 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2sfwfs86ne-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 14 May 2019 11:26:44 -0400 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 14 May 2019 16:26:38 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x4EFQbpo37224662 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 14 May 2019 15:26:37 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4309AA405D; Tue, 14 May 2019 15:26:37 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D7558A4053; Tue, 14 May 2019 15:26:36 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.148.90]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 14 May 2019 15:26:36 +0000 (GMT) Subject: Re: [PATCH v2 1/2] KVM: Start populating /sys/hypervisor with KVM entries To: Filippo Sironi , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, boris.ostrovsky@oracle.com, cohuck@redhat.com, konrad.wilk@oracle.com, xen-devel@lists.xenproject.org, vasu.srinivasan@oracle.com References: <1539078879-4372-1-git-send-email-sironi@amazon.de> <1557847002-23519-1-git-send-email-sironi@amazon.de> <1557847002-23519-2-git-send-email-sironi@amazon.de> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <1557847002-23519-2-git-send-email-sironi@amazon.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19051415-0016-0000-0000-0000027B9D62 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19051415-0017-0000-0000-000032D868EB Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-05-14_10:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1905140108 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 14.05.19 17:16, Filippo Sironi wrote: > Start populating /sys/hypervisor with KVM entries when we're running on > KVM. This is to replicate functionality that's available when we're > running on Xen. > > Start with /sys/hypervisor/uuid, which users prefer over > /sys/devices/virtual/dmi/id/product_uuid as a way to recognize a virtual > machine, since it's also available when running on Xen HVM and on Xen PV > and, on top of that doesn't require root privileges by default. > Let's create arch-specific hooks so that different architectures can > provide different implementations. > > Signed-off-by: Filippo Sironi > --- > v2: > * move the retrieval of the VM UUID out of uuid_show and into > kvm_para_get_uuid, which is a weak function that can be overwritten > > drivers/Kconfig | 2 ++ > drivers/Makefile | 2 ++ > drivers/kvm/Kconfig | 14 ++++++++++++++ > drivers/kvm/Makefile | 1 + > drivers/kvm/sys-hypervisor.c | 30 ++++++++++++++++++++++++++++++ > 5 files changed, 49 insertions(+) > create mode 100644 drivers/kvm/Kconfig > create mode 100644 drivers/kvm/Makefile > create mode 100644 drivers/kvm/sys-hypervisor.c > > diff --git a/drivers/Kconfig b/drivers/Kconfig > index 45f9decb9848..90eb835fe951 100644 > --- a/drivers/Kconfig > +++ b/drivers/Kconfig > @@ -146,6 +146,8 @@ source "drivers/hv/Kconfig" > > source "drivers/xen/Kconfig" > > +source "drivers/kvm/Kconfig" > + > source "drivers/staging/Kconfig" > > source "drivers/platform/Kconfig" > diff --git a/drivers/Makefile b/drivers/Makefile > index c61cde554340..79cc92a3f6bf 100644 > --- a/drivers/Makefile > +++ b/drivers/Makefile > @@ -44,6 +44,8 @@ obj-y += soc/ > obj-$(CONFIG_VIRTIO) += virtio/ > obj-$(CONFIG_XEN) += xen/ > > +obj-$(CONFIG_KVM_GUEST) += kvm/ > + > # regulators early, since some subsystems rely on them to initialize > obj-$(CONFIG_REGULATOR) += regulator/ > > diff --git a/drivers/kvm/Kconfig b/drivers/kvm/Kconfig > new file mode 100644 > index 000000000000..3fc041df7c11 > --- /dev/null > +++ b/drivers/kvm/Kconfig > @@ -0,0 +1,14 @@ > +menu "KVM driver support" > + depends on KVM_GUEST > + > +config KVM_SYS_HYPERVISOR > + bool "Create KVM entries under /sys/hypervisor" > + depends on SYSFS > + select SYS_HYPERVISOR > + default y > + help > + Create KVM entries under /sys/hypervisor (e.g., uuid). When running > + native or on another hypervisor, /sys/hypervisor may still be > + present, but it will have no KVM entries. > + > +endmenu > diff --git a/drivers/kvm/Makefile b/drivers/kvm/Makefile > new file mode 100644 > index 000000000000..73a43fc994b9 > --- /dev/null > +++ b/drivers/kvm/Makefile > @@ -0,0 +1 @@ > +obj-$(CONFIG_KVM_SYS_HYPERVISOR) += sys-hypervisor.o > diff --git a/drivers/kvm/sys-hypervisor.c b/drivers/kvm/sys-hypervisor.c > new file mode 100644 > index 000000000000..43b1d1a09807 > --- /dev/null > +++ b/drivers/kvm/sys-hypervisor.c > @@ -0,0 +1,30 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > + > +#include > + > +#include > +#include > + > +__weak const char *kvm_para_get_uuid(void) > +{ > + return NULL; > +} > + > +static ssize_t uuid_show(struct kobject *obj, > + struct kobj_attribute *attr, > + char *buf) > +{ > + const char *uuid = kvm_para_get_uuid(); I would prefer to have kvm_para_get_uuid return a uuid_t but char * will probably work out as well. > + return sprintf(buf, "%s\n", uuid); > +} > + > +static struct kobj_attribute uuid = __ATTR_RO(uuid); > + > +static int __init uuid_init(void) > +{ > + if (!kvm_para_available()) Isnt kvm_para_available a function that is defined in the context of the HOST and not of the guest? > + return 0; > + return sysfs_create_file(hypervisor_kobj, &uuid.attr); > +} > + > +device_initcall(uuid_init); >