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

From Xiao Guangrong <guangrong.xiao@linux.intel.com>
Newsgroups linux.kernel
Subject Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed
Date 2016-07-04 08:50 +0200
Message-ID <rR5RE-2gx-7@gated-at.bofh.it> (permalink)
References <rPJTb-1y9-7@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On 06/30/2016 09:01 PM, 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.

Why does it require fetching the pfn when the fault is triggered rather
than when mmap() is called?

Why the memory mapped by this mmap() is not a portion of MMIO from
underlayer physical device? If it is a valid system memory, is this interface
really needed to implemented in vfio? (you at least need to set VM_MIXEDMAP
if it mixed system memory with MMIO)

IIUC, the kernel assumes that VM_PFNMAP is a continuous memory, e.g, like
current KVM and vaddr_get_pfn() in vfio, but it seems nvdia's patchset
breaks this semantic as ops->validate_map_request() can adjust the physical
address arbitrarily. (again, the name 'validate' should be changed to match
the thing as it is really doing)

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Thread

[PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Paolo Bonzini <pbonzini@redhat.com> - 2016-06-30 15:10 +0200
  [PATCH 1/2] KVM: MMU: prepare to support mapping of VM_IO and VM_PFNMAP frames Paolo Bonzini <pbonzini@redhat.com> - 2016-06-30 15:10 +0200
  Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-01 00:10 +0200
  Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-04 08:50 +0200
    Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-04 09:10 +0200
      Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-04 09:50 +0200
        Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Paolo Bonzini <pbonzini@redhat.com> - 2016-07-04 09:50 +0200
          Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-04 10:10 +0200
            Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Paolo Bonzini <pbonzini@redhat.com> - 2016-07-04 10:20 +0200
              Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-04 10:30 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Paolo Bonzini <pbonzini@redhat.com> - 2016-07-04 10:50 +0200
        Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-04 10:00 +0200
          Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-04 17:40 +0200
            Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-05 03:30 +0200
              Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-05 03:40 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-05 06:10 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-05 07:20 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-05 08:40 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-05 09:40 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-05 11:10 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-05 17:10 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-06 04:30 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-06 06:10 +0200
          Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-04 10:30 +0200
            Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-04 12:30 +0200
            Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-04 10:50 +0200
              Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-04 10:50 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-04 11:00 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-04 11:20 +0200
    Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Paolo Bonzini <pbonzini@redhat.com> - 2016-07-04 09:40 +0200
      Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-04 09:50 +0200
  Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-05 07:50 +0200
    Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Paolo Bonzini <pbonzini@redhat.com> - 2016-07-05 14:20 +0200
      Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-05 16:10 +0200
      Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-06 04:10 +0200
        Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-06 04:20 +0200
          Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-06 04:40 +0200
            Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Neo Jia <cjia@nvidia.com> - 2016-07-06 05:00 +0200
              Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-06 06:10 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Paolo Bonzini <pbonzini@redhat.com> - 2016-07-06 13:50 +0200
                Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Xiao Guangrong <guangrong.xiao@linux.intel.com> - 2016-07-07 04:50 +0200
        Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Paolo Bonzini <pbonzini@redhat.com> - 2016-07-06 08:10 +0200
          Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed Alex Williamson <alex.williamson@redhat.com> - 2016-07-06 18:00 +0200

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