From patchwork Tue Jul 18 13:55:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yi Liu X-Patchwork-Id: 13317311 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AC566C0015E for ; Tue, 18 Jul 2023 13:58:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233059AbjGRN6T (ORCPT ); Tue, 18 Jul 2023 09:58:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56236 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233156AbjGRN6D (ORCPT ); Tue, 18 Jul 2023 09:58:03 -0400 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6FB9519A0; Tue, 18 Jul 2023 06:57:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1689688663; x=1721224663; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=YaRGpjj7I+GMXdcc3KIUaOmLLrRW7d35dueJ3AuGdR4=; b=Dbe+DLt23zfnsD8yvXFVJTLWiTV2T7sKLob5j/s2jEG2J6+hsDvwOqXV gxg6nfZXw/vja64NXSkQX26TLO1H1NFnfQLVI9QtuaMY8/JqJkt1eN1WT 3smhSxJYDfwlHwITI0EXhUjnBz27ryEhfqVcdBzPK150q05XlYRIIHvaR vbPlMesfXftIb/BcyrPSybOTKUqzlSV2UuFQ28oR5oiqPBDTOaoEBq/VK tWewe7ghxiVBxGIbs/+ukIbg6OFwBO1tVtyw5YqOZvexweeZ8lLut3u+T 3bbox71kk8a1dw9LeCUkZ01DU3F5hQDNzPF469oMbqU+A0SCbMOtBE5Nd w==; X-IronPort-AV: E=McAfee;i="6600,9927,10775"; a="452590770" X-IronPort-AV: E=Sophos;i="6.01,214,1684825200"; d="scan'208";a="452590770" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jul 2023 06:56:09 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10775"; a="970251076" X-IronPort-AV: E=Sophos;i="6.01,214,1684825200"; d="scan'208";a="970251076" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by fmsmga006.fm.intel.com with ESMTP; 18 Jul 2023 06:56:08 -0700 From: Yi Liu To: alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com Cc: joro@8bytes.org, robin.murphy@arm.com, cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-s390@vger.kernel.org, xudong.hao@intel.com, yan.y.zhao@intel.com, terrence.xu@intel.com, yanting.jiang@intel.com, zhenzhong.duan@intel.com, clegoate@redhat.com Subject: [PATCH v15 19/26] vfio: Test kvm pointer in _vfio_device_get_kvm_safe() Date: Tue, 18 Jul 2023 06:55:44 -0700 Message-Id: <20230718135551.6592-20-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230718135551.6592-1-yi.l.liu@intel.com> References: <20230718135551.6592-1-yi.l.liu@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This saves some lines when adding the kvm get logic for the vfio_device cdev path. This also renames _vfio_device_get_kvm_safe() to be vfio_device_get_kvm_safe(). Suggested-by: Jason Gunthorpe Reviewed-by: Jason Gunthorpe Tested-by: Zhenzhong Duan Signed-off-by: Yi Liu --- drivers/vfio/group.c | 7 +------ drivers/vfio/vfio.h | 6 +++--- drivers/vfio/vfio_main.c | 5 ++++- 3 files changed, 8 insertions(+), 10 deletions(-) diff --git a/drivers/vfio/group.c b/drivers/vfio/group.c index 41a09a2df690..5c17ad812313 100644 --- a/drivers/vfio/group.c +++ b/drivers/vfio/group.c @@ -160,12 +160,7 @@ static int vfio_group_ioctl_set_container(struct vfio_group *group, static void vfio_device_group_get_kvm_safe(struct vfio_device *device) { spin_lock(&device->group->kvm_ref_lock); - if (!device->group->kvm) - goto unlock; - - _vfio_device_get_kvm_safe(device, device->group->kvm); - -unlock: + vfio_device_get_kvm_safe(device, device->group->kvm); spin_unlock(&device->group->kvm_ref_lock); } diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h index fb8f2fac3d23..c2aa65382592 100644 --- a/drivers/vfio/vfio.h +++ b/drivers/vfio/vfio.h @@ -340,11 +340,11 @@ enum { vfio_noiommu = false }; #endif #ifdef CONFIG_HAVE_KVM -void _vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm); +void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm); void vfio_device_put_kvm(struct vfio_device *device); #else -static inline void _vfio_device_get_kvm_safe(struct vfio_device *device, - struct kvm *kvm) +static inline void vfio_device_get_kvm_safe(struct vfio_device *device, + struct kvm *kvm) { } diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 8a9ebcc6980b..5f7c3151d8c0 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -373,7 +373,7 @@ void vfio_unregister_group_dev(struct vfio_device *device) EXPORT_SYMBOL_GPL(vfio_unregister_group_dev); #ifdef CONFIG_HAVE_KVM -void _vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm) +void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm) { void (*pfn)(struct kvm *kvm); bool (*fn)(struct kvm *kvm); @@ -381,6 +381,9 @@ void _vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm) lockdep_assert_held(&device->dev_set->lock); + if (!kvm) + return; + pfn = symbol_get(kvm_put_kvm); if (WARN_ON(!pfn)) return;