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vfio: Introduce a vfio_uninit_group_dev() API call

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This pairs with vfio_init_group_dev() and allows undoing any state that is
stored in the vfio_device unrelated to registration. Add appropriately
placed calls to all the drivers.

The following patch will use this to add pre-registration state for the
device set.

Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/3-v4-9ea22c5e6afb+1adf-vfio_reflck_jgg@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Max Gurtovoy
2021-08-05 22:18:59 -03:00
committed by Alex Williamson
parent de5494af48
commit ae03c3771b
10 changed files with 64 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
samples/vfio-mdev/mbochs.c
View File

@@ -559,6 +559,7 @@ static int mbochs_probe(struct mdev_device *mdev)
dev_set_drvdata(&mdev->dev, mdev_state);
return 0;
err_mem:
vfio_uninit_group_dev(&mdev_state->vdev);
kfree(mdev_state->pages);
kfree(mdev_state->vconfig);
kfree(mdev_state);
@@ -572,6 +573,7 @@ static void mbochs_remove(struct mdev_device *mdev)
struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
vfio_unregister_group_dev(&mdev_state->vdev);
vfio_uninit_group_dev(&mdev_state->vdev);
atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes);
kfree(mdev_state->pages);
kfree(mdev_state->vconfig);

25
samples/vfio-mdev/mdpy.c
View File

@@ -235,17 +235,16 @@ static int mdpy_probe(struct mdev_device *mdev)
mdev_state->vconfig = kzalloc(MDPY_CONFIG_SPACE_SIZE, GFP_KERNEL);
if (mdev_state->vconfig == NULL) {
kfree(mdev_state);
return -ENOMEM;
ret = -ENOMEM;
goto err_state;
}
fbsize = roundup_pow_of_two(type->width * type->height * type->bytepp);
mdev_state->memblk = vmalloc_user(fbsize);
if (!mdev_state->memblk) {
kfree(mdev_state->vconfig);
kfree(mdev_state);
return -ENOMEM;
ret = -ENOMEM;
goto err_vconfig;
}
dev_info(dev, "%s: %s (%dx%d)\n", __func__, type->name, type->width,
type->height);
@@ -260,13 +259,18 @@ static int mdpy_probe(struct mdev_device *mdev)
mdpy_count++;
ret = vfio_register_group_dev(&mdev_state->vdev);
if (ret) {
kfree(mdev_state->vconfig);
kfree(mdev_state);
return ret;
}
if (ret)
goto err_mem;
dev_set_drvdata(&mdev->dev, mdev_state);
return 0;
err_mem:
vfree(mdev_state->memblk);
err_vconfig:
kfree(mdev_state->vconfig);
err_state:
vfio_uninit_group_dev(&mdev_state->vdev);
kfree(mdev_state);
return ret;
}
static void mdpy_remove(struct mdev_device *mdev)
@@ -278,6 +282,7 @@ static void mdpy_remove(struct mdev_device *mdev)
vfio_unregister_group_dev(&mdev_state->vdev);
vfree(mdev_state->memblk);
kfree(mdev_state->vconfig);
vfio_uninit_group_dev(&mdev_state->vdev);
kfree(mdev_state);
mdpy_count--;

27
samples/vfio-mdev/mtty.c
View File

@@ -718,8 +718,8 @@ static int mtty_probe(struct mdev_device *mdev)
mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
if (mdev_state == NULL) {
atomic_add(nr_ports, &mdev_avail_ports);
return -ENOMEM;
ret = -ENOMEM;
goto err_nr_ports;
}
vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mtty_dev_ops);
@@ -732,9 +732,8 @@ static int mtty_probe(struct mdev_device *mdev)
mdev_state->vconfig = kzalloc(MTTY_CONFIG_SPACE_SIZE, GFP_KERNEL);
if (mdev_state->vconfig == NULL) {
kfree(mdev_state);
atomic_add(nr_ports, &mdev_avail_ports);
return -ENOMEM;
ret = -ENOMEM;
goto err_state;
}
mutex_init(&mdev_state->ops_lock);
@@ -743,14 +742,19 @@ static int mtty_probe(struct mdev_device *mdev)
mtty_create_config_space(mdev_state);
ret = vfio_register_group_dev(&mdev_state->vdev);
if (ret) {
kfree(mdev_state);
atomic_add(nr_ports, &mdev_avail_ports);
return ret;
}
if (ret)
goto err_vconfig;
dev_set_drvdata(&mdev->dev, mdev_state);
return 0;
err_vconfig:
kfree(mdev_state->vconfig);
err_state:
vfio_uninit_group_dev(&mdev_state->vdev);
kfree(mdev_state);
err_nr_ports:
atomic_add(nr_ports, &mdev_avail_ports);
return ret;
}
static void mtty_remove(struct mdev_device *mdev)
@@ -761,6 +765,7 @@ static void mtty_remove(struct mdev_device *mdev)
vfio_unregister_group_dev(&mdev_state->vdev);
kfree(mdev_state->vconfig);
vfio_uninit_group_dev(&mdev_state->vdev);
kfree(mdev_state);
atomic_add(nr_ports, &mdev_avail_ports);
}