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vfio: clean up the check for mediated device in vfio_iommu_type1 

Pass the group flags to ->attach_group and remove the messy check for
the bus type.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20210924155705.4258-12-hch@lst.de
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Christoph Hellwig 2021-09-24 17:57:01 +02:00 committed by Alex Williamson
parent fda49d97f2
commit c3c0fa9d94
4 changed files with 34 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
drivers/vfio/vfio.c
View File

@ -68,30 +68,6 @@ struct vfio_unbound_dev {
struct list_head unbound_next;
};
enum vfio_group_type {
/*
* Physical device with IOMMU backing.
*/
VFIO_IOMMU,
/*
* Virtual device without IOMMU backing. The VFIO core fakes up an
* iommu_group as the iommu_group sysfs interface is part of the
* userspace ABI. The user of these devices must not be able to
* directly trigger unmediated DMA.
*/
VFIO_EMULATED_IOMMU,
/*
* Physical device without IOMMU backing. The VFIO core fakes up an
* iommu_group as the iommu_group sysfs interface is part of the
* userspace ABI. Users can trigger unmediated DMA by the device,
* usage is highly dangerous, requires an explicit opt-in and will
* taint the kernel.
*/
VFIO_NO_IOMMU,
};
struct vfio_group {
struct kref kref;
int minor;
@ -219,7 +195,7 @@ static long vfio_noiommu_ioctl(void *iommu_data,
}
static int vfio_noiommu_attach_group(void *iommu_data,
struct iommu_group *iommu_group)
struct iommu_group *iommu_group, enum vfio_group_type type)
{
return 0;
}
@ -1129,7 +1105,8 @@ static int __vfio_container_attach_groups(struct vfio_container *container,
int ret = -ENODEV;
list_for_each_entry(group, &container->group_list, container_next) {
ret = driver->ops->attach_group(data, group->iommu_group);
ret = driver->ops->attach_group(data, group->iommu_group,
group->type);
if (ret)
goto unwind;
}
@ -1387,7 +1364,8 @@ static int vfio_group_set_container(struct vfio_group *group, int container_fd)
driver = container->iommu_driver;
if (driver) {
ret = driver->ops->attach_group(container->iommu_data,
group->iommu_group);
group->iommu_group,
group->type);
if (ret)
goto unlock_out;
}

27
drivers/vfio/vfio.h
View File

@ -4,6 +4,30 @@
* Author: Alex Williamson <alex.williamson@redhat.com>
*/
enum vfio_group_type {
/*
* Physical device with IOMMU backing.
*/
VFIO_IOMMU,
/*
* Virtual device without IOMMU backing. The VFIO core fakes up an
* iommu_group as the iommu_group sysfs interface is part of the
* userspace ABI. The user of these devices must not be able to
* directly trigger unmediated DMA.
*/
VFIO_EMULATED_IOMMU,
/*
* Physical device without IOMMU backing. The VFIO core fakes up an
* iommu_group as the iommu_group sysfs interface is part of the
* userspace ABI. Users can trigger unmediated DMA by the device,
* usage is highly dangerous, requires an explicit opt-in and will
* taint the kernel.
*/
VFIO_NO_IOMMU,
};
/* events for the backend driver notify callback */
enum vfio_iommu_notify_type {
VFIO_IOMMU_CONTAINER_CLOSE = 0,
@ -20,7 +44,8 @@ struct vfio_iommu_driver_ops {
long (*ioctl)(void *iommu_data, unsigned int cmd,
unsigned long arg);
int (*attach_group)(void *iommu_data,
struct iommu_group *group);
struct iommu_group *group,
enum vfio_group_type);
void (*detach_group)(void *iommu_data,
struct iommu_group *group);
int (*pin_pages)(void *iommu_data,

2
drivers/vfio/vfio_iommu_spapr_tce.c
View File

@ -1239,7 +1239,7 @@ release_exit:
}
static int tce_iommu_attach_group(void *iommu_data,
struct iommu_group *iommu_group)
struct iommu_group *iommu_group, enum vfio_group_type type)
{
int ret = 0;
struct tce_container *container = iommu_data;

19
drivers/vfio/vfio_iommu_type1.c
View File

@ -36,7 +36,6 @@
#include <linux/uaccess.h>
#include <linux/vfio.h>
#include <linux/workqueue.h>
#include <linux/mdev.h>
#include <linux/notifier.h>
#include <linux/dma-iommu.h>
#include <linux/irqdomain.h>
@ -1934,20 +1933,6 @@ static bool vfio_iommu_has_sw_msi(struct list_head *group_resv_regions,
return ret;
}
static bool vfio_bus_is_mdev(struct bus_type *bus)
{
struct bus_type *mdev_bus;
bool ret = false;
mdev_bus = symbol_get(mdev_bus_type);
if (mdev_bus) {
ret = (bus == mdev_bus);
symbol_put(mdev_bus_type);
}
return ret;
}
/*
* This is a helper function to insert an address range to iova list.
* The list is initially created with a single entry corresponding to
@ -2172,7 +2157,7 @@ static void vfio_iommu_iova_insert_copy(struct vfio_iommu *iommu,
}
static int vfio_iommu_type1_attach_group(void *iommu_data,
struct iommu_group *iommu_group)
struct iommu_group *iommu_group, enum vfio_group_type type)
{
struct vfio_iommu *iommu = iommu_data;
struct vfio_iommu_group *group;
@ -2207,7 +2192,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
if (ret)
goto out_free;
if (vfio_bus_is_mdev(bus)) {
if (type == VFIO_EMULATED_IOMMU) {
if (!iommu->external_domain) {
INIT_LIST_HEAD(&domain->group_list);
iommu->external_domain = domain;