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Merge tag 'vfio-v4.5-rc2' of git://github.com/awilliam/linux-vfio

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Pull VFIO fix from Alex Williamson:
 "Use alternate group tracking for no-iommu"

* tag 'vfio-v4.5-rc2' of git://github.com/awilliam/linux-vfio:
  vfio/noiommu: Don't use iommu_present() to track fake groups
This commit is contained in:
Linus Torvalds
2016-01-31 14:38:37 -08:00
parent bb4768004b 16ab8a5cbe
commit 660f6fea42
1 changed files with 10 additions and 14 deletions
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24
drivers/vfio/vfio.c
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@@ -123,8 +123,8 @@ struct iommu_group *vfio_iommu_group_get(struct device *dev)
/*
* With noiommu enabled, an IOMMU group will be created for a device
* that doesn't already have one and doesn't have an iommu_ops on their
* bus. We use iommu_present() again in the main code to detect these
* fake groups.
* bus. We set iommudata simply to be able to identify these groups
* as special use and for reclamation later.
*/
if (group || !noiommu || iommu_present(dev->bus))
return group;
@@ -134,6 +134,7 @@ struct iommu_group *vfio_iommu_group_get(struct device *dev)
return NULL;
iommu_group_set_name(group, "vfio-noiommu");
iommu_group_set_iommudata(group, &noiommu, NULL);
ret = iommu_group_add_device(group, dev);
iommu_group_put(group);
if (ret)
@@ -158,7 +159,7 @@ EXPORT_SYMBOL_GPL(vfio_iommu_group_get);
void vfio_iommu_group_put(struct iommu_group *group, struct device *dev)
{
#ifdef CONFIG_VFIO_NOIOMMU
if (!iommu_present(dev->bus))
if (iommu_group_get_iommudata(group) == &noiommu)
iommu_group_remove_device(dev);
#endif
@@ -190,16 +191,10 @@ static long vfio_noiommu_ioctl(void *iommu_data,
return -ENOTTY;
}
static int vfio_iommu_present(struct device *dev, void *unused)
{
return iommu_present(dev->bus) ? 1 : 0;
}
static int vfio_noiommu_attach_group(void *iommu_data,
struct iommu_group *iommu_group)
{
return iommu_group_for_each_dev(iommu_group, NULL,
vfio_iommu_present) ? -EINVAL : 0;
return iommu_group_get_iommudata(iommu_group) == &noiommu ? 0 : -EINVAL;
}
static void vfio_noiommu_detach_group(void *iommu_data,
@@ -323,8 +318,7 @@ static void vfio_group_unlock_and_free(struct vfio_group *group)
/**
* Group objects - create, release, get, put, search
*/
static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group,
bool iommu_present)
static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group)
{
struct vfio_group *group, *tmp;
struct device *dev;
@@ -342,7 +336,9 @@ static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group,
atomic_set(&group->container_users, 0);
atomic_set(&group->opened, 0);
group->iommu_group = iommu_group;
group->noiommu = !iommu_present;
#ifdef CONFIG_VFIO_NOIOMMU
group->noiommu = (iommu_group_get_iommudata(iommu_group) == &noiommu);
#endif
group->nb.notifier_call = vfio_iommu_group_notifier;
@@ -767,7 +763,7 @@ int vfio_add_group_dev(struct device *dev,
group = vfio_group_get_from_iommu(iommu_group);
if (!group) {
group = vfio_create_group(iommu_group, iommu_present(dev->bus));
group = vfio_create_group(iommu_group);
if (IS_ERR(group)) {
iommu_group_put(iommu_group);
return PTR_ERR(group);