From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: [PATCH v3 2/9] kvm-vfio: Decouple only when we match a group From: Alex Williamson To: kvm@vger.kernel.org Cc: Alexey Kardashevskiy , linux-kernel@vger.kernel.org, stable@vger.kernel.org, linux@armlinux.org.uk, eric.auger@redhat.com, alex.williamson@redhat.com, Paolo Bonzini Date: Tue, 20 Jun 2017 09:47:50 -0600 Message-ID: <20170620154750.17487.94673.stgit@gimli.home> In-Reply-To: <20170620154312.17487.66916.stgit@gimli.home> References: <20170620154312.17487.66916.stgit@gimli.home> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: Unset-KVM and decrement-assignment only when we find the group in our list. Otherwise we can get out of sync if the user triggers this for groups that aren't currently on our list. Signed-off-by: Alex Williamson Reviewed-by: Alexey Kardashevskiy Cc: Paolo Bonzini Cc: Eric Auger Cc: stable@vger.kernel.org --- virt/kvm/vfio.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c index 37d9118fd84b..6e002d0f3191 100644 --- a/virt/kvm/vfio.c +++ b/virt/kvm/vfio.c @@ -246,21 +246,20 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg) continue; list_del(&kvg->node); + kvm_arch_end_assignment(dev->kvm); +#ifdef CONFIG_SPAPR_TCE_IOMMU + kvm_spapr_tce_release_vfio_group(dev->kvm, + kvg->vfio_group); +#endif + kvm_vfio_group_set_kvm(kvg->vfio_group, NULL); kvm_vfio_group_put_external_user(kvg->vfio_group); kfree(kvg); ret = 0; break; } - kvm_arch_end_assignment(dev->kvm); - mutex_unlock(&kv->lock); -#ifdef CONFIG_SPAPR_TCE_IOMMU - kvm_spapr_tce_release_vfio_group(dev->kvm, vfio_group); -#endif - kvm_vfio_group_set_kvm(vfio_group, NULL); - kvm_vfio_group_put_external_user(vfio_group); kvm_vfio_update_coherency(dev);