Messages in this thread | | | Subject | Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed | From | Xiao Guangrong <> | Date | Wed, 6 Jul 2016 10:00:46 +0800 |
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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.
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