On 07/05/2016 08:18 PM, Paolo Bonzini wrote:
On 05/07/2016 07:41, Neo Jia wrote:
On Thu, Jun 30, 2016 at 03:01:49PM +0200, Paolo Bonzini wrote:
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.
Hi Paolo,
I have tested your patches with the mediated passthru patchset that is being
reviewed in KVM and QEMU mailing list.
The fault handler gets called successfully and the previously mapped memory gets
unmmaped correctly via unmap_mapping_range.
Great, then I'll include them in 4.8.
Code is okay, but i still suspect if this implementation, fetch mmio pages in
fault
handler, is needed. We'd better include these patches after the design of vfio
framework is decided.