From 819da99a7360f7e197038d12f0eba626bde11856 Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Fri, 7 Oct 2022 11:04:40 -0300 Subject: vfio: Hold a reference to the iommu_group in kvm for SPAPR SPAPR exists completely outside the normal iommu driver framework, the groups it creates are fake and are only created to enable VFIO's uAPI. Thus, it does not need to follow the iommu core rule that the iommu_group will only be touched while a driver is attached. Carry a group reference into KVM and have KVM directly manage the lifetime of this object independently of VFIO. This means KVM no longer relies on the vfio group file being valid to maintain the group reference. Tested-by: Matthew Rosato Signed-off-by: Jason Gunthorpe Link: https://lore.kernel.org/r/2-v2-15417f29324e+1c-vfio_group_disassociate_jgg@nvidia.com Signed-off-by: Alex Williamson --- virt/kvm/vfio.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) (limited to 'virt') diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c index 54aec3b0559c..495ceabffe88 100644 --- a/virt/kvm/vfio.c +++ b/virt/kvm/vfio.c @@ -24,6 +24,9 @@ struct kvm_vfio_group { struct list_head node; struct file *file; +#ifdef CONFIG_SPAPR_TCE_IOMMU + struct iommu_group *iommu_group; +#endif }; struct kvm_vfio { @@ -97,12 +100,12 @@ static struct iommu_group *kvm_vfio_file_iommu_group(struct file *file) static void kvm_spapr_tce_release_vfio_group(struct kvm *kvm, struct kvm_vfio_group *kvg) { - struct iommu_group *grp = kvm_vfio_file_iommu_group(kvg->file); - - if (WARN_ON_ONCE(!grp)) + if (WARN_ON_ONCE(!kvg->iommu_group)) return; - kvm_spapr_tce_release_iommu_group(kvm, grp); + kvm_spapr_tce_release_iommu_group(kvm, kvg->iommu_group); + iommu_group_put(kvg->iommu_group); + kvg->iommu_group = NULL; } #endif @@ -252,19 +255,19 @@ static int kvm_vfio_group_set_spapr_tce(struct kvm_device *dev, mutex_lock(&kv->lock); list_for_each_entry(kvg, &kv->group_list, node) { - struct iommu_group *grp; - if (kvg->file != f.file) continue; - grp = kvm_vfio_file_iommu_group(kvg->file); - if (WARN_ON_ONCE(!grp)) { - ret = -EIO; - goto err_fdput; + if (!kvg->iommu_group) { + kvg->iommu_group = kvm_vfio_file_iommu_group(kvg->file); + if (WARN_ON_ONCE(!kvg->iommu_group)) { + ret = -EIO; + goto err_fdput; + } } ret = kvm_spapr_tce_attach_iommu_group(dev->kvm, param.tablefd, - grp); + kvg->iommu_group); break; } -- cgit v1.2.3