diff options
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/vfio.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c index d32f239eb471..37d9118fd84b 100644 --- a/virt/kvm/vfio.c +++ b/virt/kvm/vfio.c @@ -20,6 +20,10 @@ #include <linux/vfio.h> #include "vfio.h" +#ifdef CONFIG_SPAPR_TCE_IOMMU +#include <asm/kvm_ppc.h> +#endif + struct kvm_vfio_group { struct list_head node; struct vfio_group *vfio_group; @@ -89,6 +93,47 @@ static bool kvm_vfio_group_is_coherent(struct vfio_group *vfio_group) return ret > 0; } +#ifdef CONFIG_SPAPR_TCE_IOMMU +static int kvm_vfio_external_user_iommu_id(struct vfio_group *vfio_group) +{ + int (*fn)(struct vfio_group *); + int ret = -EINVAL; + + fn = symbol_get(vfio_external_user_iommu_id); + if (!fn) + return ret; + + ret = fn(vfio_group); + + symbol_put(vfio_external_user_iommu_id); + + return ret; +} + +static struct iommu_group *kvm_vfio_group_get_iommu_group( + struct vfio_group *group) +{ + int group_id = kvm_vfio_external_user_iommu_id(group); + + if (group_id < 0) + return NULL; + + return iommu_group_get_by_id(group_id); +} + +static void kvm_spapr_tce_release_vfio_group(struct kvm *kvm, + struct vfio_group *vfio_group) +{ + struct iommu_group *grp = kvm_vfio_group_get_iommu_group(vfio_group); + + if (WARN_ON_ONCE(!grp)) + return; + + kvm_spapr_tce_release_iommu_group(kvm, grp); + iommu_group_put(grp); +} +#endif + /* * Groups can use the same or different IOMMU domains. If the same then * adding a new group may change the coherency of groups we've previously @@ -211,6 +256,9 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg) 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); @@ -218,6 +266,57 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg) kvm_vfio_update_coherency(dev); return ret; + +#ifdef CONFIG_SPAPR_TCE_IOMMU + case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: { + struct kvm_vfio_spapr_tce param; + struct kvm_vfio *kv = dev->private; + struct vfio_group *vfio_group; + struct kvm_vfio_group *kvg; + struct fd f; + struct iommu_group *grp; + + if (copy_from_user(¶m, (void __user *)arg, + sizeof(struct kvm_vfio_spapr_tce))) + return -EFAULT; + + f = fdget(param.groupfd); + if (!f.file) + return -EBADF; + + vfio_group = kvm_vfio_group_get_external_user(f.file); + fdput(f); + + if (IS_ERR(vfio_group)) + return PTR_ERR(vfio_group); + + grp = kvm_vfio_group_get_iommu_group(vfio_group); + if (WARN_ON_ONCE(!grp)) { + kvm_vfio_group_put_external_user(vfio_group); + return -EIO; + } + + ret = -ENOENT; + + mutex_lock(&kv->lock); + + list_for_each_entry(kvg, &kv->group_list, node) { + if (kvg->vfio_group != vfio_group) + continue; + + ret = kvm_spapr_tce_attach_iommu_group(dev->kvm, + param.tablefd, grp); + break; + } + + mutex_unlock(&kv->lock); + + iommu_group_put(grp); + kvm_vfio_group_put_external_user(vfio_group); + + return ret; + } +#endif /* CONFIG_SPAPR_TCE_IOMMU */ } return -ENXIO; @@ -242,6 +341,9 @@ static int kvm_vfio_has_attr(struct kvm_device *dev, switch (attr->attr) { case KVM_DEV_VFIO_GROUP_ADD: case KVM_DEV_VFIO_GROUP_DEL: +#ifdef CONFIG_SPAPR_TCE_IOMMU + case KVM_DEV_VFIO_GROUP_SET_SPAPR_TCE: +#endif return 0; } @@ -257,6 +359,9 @@ 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) { +#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); list_del(&kvg->node); |