[PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed

[Paolo Bonzini]

The vGPU folks would like to trap the first access to a BAR by setting
vm_ops on the VMAs produced by mmap-ing a VFIO device.  The fault handler
then can use remap_pfn_range to place some non-reserved pages in the VMA.

KVM lacks support for this kind of non-linear VM_PFNMAP mapping, and these
patches should fix this.

Thanks,

Paolo

Paolo Bonzini (2):
  KVM: MMU: prepare to support mapping of VM_IO and VM_PFNMAP frames
  KVM: MMU: try to fix up page faults before giving up

 mm/gup.c            |  1 +
 virt/kvm/kvm_main.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 51 insertions(+), 5 deletions(-)

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1.8.3.1