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Diffstat (limited to 'virt/kvm/vfio.c')
-rw-r--r--virt/kvm/vfio.c45
1 files changed, 32 insertions, 13 deletions
diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
index ce1b01d02c51..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 {
@@ -61,6 +64,23 @@ static bool kvm_vfio_file_enforced_coherent(struct file *file)
return ret;
}
+static bool kvm_vfio_file_is_group(struct file *file)
+{
+ bool (*fn)(struct file *file);
+ bool ret;
+
+ fn = symbol_get(vfio_file_is_group);
+ if (!fn)
+ return false;
+
+ ret = fn(file);
+
+ symbol_put(vfio_file_is_group);
+
+ return ret;
+}
+
+#ifdef CONFIG_SPAPR_TCE_IOMMU
static struct iommu_group *kvm_vfio_file_iommu_group(struct file *file)
{
struct iommu_group *(*fn)(struct file *file);
@@ -77,16 +97,15 @@ static struct iommu_group *kvm_vfio_file_iommu_group(struct file *file)
return ret;
}
-#ifdef CONFIG_SPAPR_TCE_IOMMU
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
@@ -136,7 +155,7 @@ static int kvm_vfio_group_add(struct kvm_device *dev, unsigned int fd)
return -EBADF;
/* Ensure the FD is a vfio group FD.*/
- if (!kvm_vfio_file_iommu_group(filp)) {
+ if (!kvm_vfio_file_is_group(filp)) {
ret = -EINVAL;
goto err_fput;
}
@@ -236,19 +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;
}