kernel.git/drivers/vfio/vfio.c, branch linux-3.11.y

vfio: Ignore sprurious notifies

2013-07-24T22:36:40Z

Remove debugging WARN_ON if we get a spurious notify for a group that no longer exists. No reports of anyone hitting this, but it would likely be a race and not a bug if they did. Signed-off-by: Alex Williamson

vfio: Don't overreact to DEL_DEVICE

2013-07-24T22:36:00Z

BUS_NOTIFY_DEL_DEVICE triggers IOMMU drivers to remove devices from their iommu group, but there's really nothing we can do about it at this point. If the device is in use, then the vfio sub-driver will block the device_del from completing until it's released. If the device is not in use or not owned by a vfio sub-driver, then we really don't care that it's being removed. The current code can be triggered just by unloading an sr-iov driver (ex. igb) while the VFs are attached to vfio-pci because it makes an incorrect assumption about the ordering of driver remove callbacks vs the DEL_DEVICE notification. Signed-off-by: Alex Williamson

Merge tag 'vfio-v3.11' of git://github.com/awilliam/linux-vfio

2013-07-10T21:50:08Z

Pull vfio updates from Alex Williamson: "Largely hugepage support for vfio/type1 iommu and surrounding cleanups and fixes" * tag 'vfio-v3.11' of git://github.com/awilliam/linux-vfio: vfio/type1: Fix leak on error path vfio: Limit group opens vfio/type1: Fix missed frees and zero sized removes vfio: fix documentation vfio: Provide module option to disable vfio_iommu_type1 hugepage support vfio: hugepage support for vfio_iommu_type1 vfio: Convert type1 iommu to use rbtree

vfio: Limit group opens

2013-06-25T22:06:54Z

vfio_group_fops_open attempts to limit concurrent sessions by disallowing opens once group->container is set. This really doesn't do what we want and allow for inconsistent behavior, for instance a group can be opened twice, then a container set giving the user two file descriptors to the group. But then it won't allow more to be opened. There's not much reason to have the group opened multiple times since most access is through devices or the container, so complete what the original code intended and only allow a single instance. Signed-off-by: Alex Williamson

powerpc/vfio: Implement IOMMU driver for VFIO

2013-06-20T06:55:14Z

VFIO implements platform independent stuff such as a PCI driver, BAR access (via read/write on a file descriptor or direct mapping when possible) and IRQ signaling. The platform dependent part includes IOMMU initialization and handling. This implements an IOMMU driver for VFIO which does mapping/unmapping pages for the guest IO and provides information about DMA window (required by a POWER guest). Cc: David Gibson Signed-off-by: Alexey Kardashevskiy Signed-off-by: Paul Mackerras Acked-by: Alex Williamson Signed-off-by: Benjamin Herrenschmidt

vfio: fix crash on rmmod

2013-06-05T14:54:16Z

devtmpfs_delete_node() calls devnode() callback with mode==NULL but vfio still tries to write there. The patch fixes this. Signed-off-by: Alexey Kardashevskiy Signed-off-by: Alex Williamson

vfio: Set container device mode

2013-04-30T21:42:28Z

Minor 0 is the VFIO container device (/dev/vfio/vfio). On it's own the container does not provide a user with any privileged access. It only supports API version check and extension check ioctls. Only by attaching a VFIO group to the container does it gain any access. Set the mode of the container to allow access. Signed-off-by: Alex Williamson

vfio: Use down_reads to protect iommu disconnects

2013-04-29T14:41:36Z

If a group or device is released or a container is unset from a group it can race against file ops on the container. Protect these with down_reads to allow concurrent users. Signed-off-by: Alex Williamson Reported-by: Michael S. Tsirkin

vfio: Convert container->group_lock to rwsem

2013-04-25T22:12:38Z

All current users are writers, maintaining current mutual exclusion. This lets us add read users next. Signed-off-by: Alex Williamson

VFIO: Wrapper for getting reference to vfio_device

2013-03-11T15:28:44Z

- Added vfio_device_get_from_dev() as wrapper to get reference to vfio_device from struct device. - Added vfio_device_data() as a wrapper to get device_data from vfio_device. Signed-off-by: Vijay Mohan Pandarathil Signed-off-by: Alex Williamson