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vfio: support notifier chain in vfio_group

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Beyond vfio_iommu events, users might also be interested in
vfio_group events. For example, if a vfio_group is used along
with Qemu/KVM, whenever kvm pointer is set to/cleared from the
vfio_group, users could be notified.

Currently only VFIO_GROUP_NOTIFY_SET_KVM supported.

Cc: Kirti Wankhede <kwankhede@nvidia.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Jike Song <jike.song@intel.com>
[aw: remove use of new typedef]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Jike Song 2016-12-01 13:20:06 +08:00 • committed by Alex Williamson
parent 22195cbd34
commit ccd46dbae7
2 changed files with 89 additions and 0 deletions
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7
include/linux/vfio.h
View file

@ -111,11 +111,15 @@ extern int vfio_unpin_pages(struct device *dev, unsigned long *user_pfn,
/* each type has independent events */
enum vfio_notify_type {
VFIO_IOMMU_NOTIFY = 0,
VFIO_GROUP_NOTIFY = 1,
};
/* events for VFIO_IOMMU_NOTIFY */
#define VFIO_IOMMU_NOTIFY_DMA_UNMAP BIT(0)
/* events for VFIO_GROUP_NOTIFY */
#define VFIO_GROUP_NOTIFY_SET_KVM BIT(0)
extern int vfio_register_notifier(struct device *dev,
enum vfio_notify_type type,
unsigned long *required_events,
@ -124,6 +128,9 @@ extern int vfio_unregister_notifier(struct device *dev,
enum vfio_notify_type type,
struct notifier_block *nb);
struct kvm;
extern void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm);
/*
* Sub-module helpers
*/