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5 Commits

Author SHA1 Message Date
Alexey Khoroshilov
498e8bf51c sample: vfio-mdev: avoid deadlock in mdev_access() 
mdev_access() calls mbochs_get_page() with mdev_state->ops_lock held,
while mbochs_get_page() locks the mutex by itself.
It leads to unavoidable deadlock.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
 2018-07-11 13:22:41 -06:00
Souptick Joarder
d7ef4899d7 sample/vfio-mdev: Change return type to vm_fault_t 
convert mbochs_region_vm_fault and mbochs_dmabuf_vm_fault
to return vm_fault_t type.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
 2018-07-04 10:42:04 -06:00
Gerd Hoffmann
7733e05b34 sample/mdev/mbochs: add mbochs_kunmap_dmabuf 
There is no default implementation for dma_buf_ops->unmap.
So add a function unmapping the page, otherwise we'll leak them.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
 2018-06-26 00:27:23 -06:00
Gerd Hoffmann
2203d8a76e sample/mdev/mbochs: remove mbochs_kmap_atomic_dmabuf 
Atomic mapping interface for dmabufs will be removed.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
 2018-06-26 00:27:22 -06:00
Gerd Hoffmann
a5e6e6505f sample: vfio bochs vbe display (host device for bochs-drm) 
Display device, demo-ing the vfio dmabuf display interface
(VFIO_GFX_PLANE_TYPE_DMABUF).  Compatible enough to qemu stdvga
that bochs-drm.ko can be used as guest driver.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
 2018-06-08 10:24:16 -06:00