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kvm: Add VFIO device

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So far we've succeeded at making KVM and VFIO mostly unaware of each
other, but areas are cropping up where a connection beyond eventfds
and irqfds needs to be made.  This patch introduces a KVM-VFIO device
that is meant to be a gateway for such interaction.  The user creates
the device and can add and remove VFIO groups to it via file
descriptors.  When a group is added, KVM verifies the group is valid
and gets a reference to it via the VFIO external user interface.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alex Williamson 2013-10-30 11:02:17 -06:00 • committed by Paolo Bonzini
parent 84cffe499b
commit ec53500fae
8 changed files with 257 additions and 1 deletions
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1
include/linux/kvm_host.h
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@ -1058,6 +1058,7 @@ struct kvm_device *kvm_device_from_filp(struct file *filp);
extern struct kvm_device_ops kvm_mpic_ops;
extern struct kvm_device_ops kvm_xics_ops;
extern struct kvm_device_ops kvm_vfio_ops;
#ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT