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vfio: add bus master feature to device feature ioctl

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add bus mastering control to VFIO_DEVICE_FEATURE IOCTL. The VFIO user
can use this feature to enable or disable the Bus Mastering of a
device bound to VFIO.

Co-developed-by: Shubham Rohila <shubham.rohila@amd.com>
Signed-off-by: Shubham Rohila <shubham.rohila@amd.com>
Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Link: https://lore.kernel.org/r/20230915045423.31630-2-nipun.gupta@amd.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Nipun Gupta 2023-09-15 10:24:22 +05:30 committed by Alex Williamson
parent a941b784b1
commit f59a7b6af0
1 changed files with 21 additions and 0 deletions
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21
include/uapi/linux/vfio.h
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@ -1434,6 +1434,27 @@ struct vfio_device_feature_mig_data_size {
#define VFIO_DEVICE_FEATURE_MIG_DATA_SIZE 9
/**
* Upon VFIO_DEVICE_FEATURE_SET, set or clear the BUS mastering for the device
* based on the operation specified in op flag.
*
* The functionality is incorporated for devices that needs bus master control,
* but the in-band device interface lacks the support. Consequently, it is not
* applicable to PCI devices, as bus master control for PCI devices is managed
* in-band through the configuration space. At present, this feature is supported
* only for CDX devices.
* When the device's BUS MASTER setting is configured as CLEAR, it will result in
* blocking all incoming DMA requests from the device. On the other hand, configuring
* the device's BUS MASTER setting as SET (enable) will grant the device the
* capability to perform DMA to the host memory.
*/
struct vfio_device_feature_bus_master {
__u32 op;
#define VFIO_DEVICE_FEATURE_CLEAR_MASTER 0 /* Clear Bus Master */
#define VFIO_DEVICE_FEATURE_SET_MASTER 1 /* Set Bus Master */
};
#define VFIO_DEVICE_FEATURE_BUS_MASTER 10
/* -------- API for Type1 VFIO IOMMU -------- */
/**