From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jike Song Subject: [v4 3/3] kvm: notify vfio on attaching and detaching Date: Tue, 15 Nov 2016 19:35:47 +0800 Message-ID: <1479209747-5564-4-git-send-email-jike.song@intel.com> References: <1479209747-5564-1-git-send-email-jike.song@intel.com> Cc: kwankhede@nvidia.com, cjia@nvidia.com, kevin.tian@intel.com, kvm@vger.kernel.org, jike.song@intel.com To: alex.williamson@redhat.com, pbonzini@redhat.com, guangrong.xiao@linux.intel.com Return-path: Received: from mga09.intel.com ([134.134.136.24]:6706 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753090AbcKOLmf (ORCPT ); Tue, 15 Nov 2016 06:42:35 -0500 In-Reply-To: <1479209747-5564-1-git-send-email-jike.song@intel.com> Sender: kvm-owner@vger.kernel.org List-ID: Sometimes vfio needs to be aware when a group attaches to a KVM or detaches from it. KVM already calls get/put method from vfio to manipulate the reference, now it can notify vfio in a similar way. Cc: Xiao Guangrong Cc: Paolo Bonzini Cc: Alex Williamson Signed-off-by: Jike Song --- virt/kvm/vfio.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c index 1dd087d..104082b 100644 --- a/virt/kvm/vfio.c +++ b/virt/kvm/vfio.c @@ -60,6 +60,32 @@ static void kvm_vfio_group_put_external_user(struct vfio_group *vfio_group) symbol_put(vfio_group_put_external_user); } +static void kvm_vfio_group_attach_kvm(struct vfio_group *group, struct kvm *kvm) +{ + void (*fn)(struct vfio_group *, struct kvm *); + + fn = symbol_get(vfio_group_notify); + if (!fn) + return; + + fn(group, kvm); + + symbol_put(vfio_group_notify); +} + +static void kvm_vfio_group_detach_kvm(struct vfio_group *group, struct kvm *kvm) +{ + void (*fn)(struct vfio_group *, struct kvm *); + + fn = symbol_get(vfio_group_notify); + if (!fn) + return; + + fn(group, NULL); + + symbol_put(vfio_group_notify); +} + static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group) { long (*fn)(struct vfio_group *, unsigned long); @@ -155,6 +181,8 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg) list_add_tail(&kvg->node, &kv->group_list); kvg->vfio_group = vfio_group; + kvm_vfio_group_attach_kvm(vfio_group, dev->kvm); + kvm_arch_start_assignment(dev->kvm); mutex_unlock(&kv->lock); @@ -196,6 +224,8 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg) mutex_unlock(&kv->lock); + kvm_vfio_group_detach_kvm(vfio_group, dev->kvm); + kvm_vfio_group_put_external_user(vfio_group); kvm_vfio_update_coherency(dev); @@ -240,6 +270,7 @@ static void kvm_vfio_destroy(struct kvm_device *dev) struct kvm_vfio_group *kvg, *tmp; list_for_each_entry_safe(kvg, tmp, &kv->group_list, node) { + kvm_vfio_group_detach_kvm(kvg->vfio_group, dev->kvm); kvm_vfio_group_put_external_user(kvg->vfio_group); list_del(&kvg->node); kfree(kvg); -- 1.9.1