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Groups > linux.kernel > #1436250
| 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 10:10 +0200 |
| Message-ID | <rR773-3bg-7@gated-at.bofh.it> (permalink) |
| References | <rPJTb-1y9-7@gated-at.bofh.it> <rR5RE-2gx-7@gated-at.bofh.it> <rR6aZ-2Cq-29@gated-at.bofh.it> <rR6NH-2Pw-1@gated-at.bofh.it> <rR6NH-2Pw-19@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 07/04/2016 03:48 PM, Paolo Bonzini wrote:
>
>
> On 04/07/2016 09:37, Xiao Guangrong wrote:
>>>>
>>>
>>> It actually is a portion of the physical mmio which is set by vfio mmap.
>>
>> So i do not think we need to care its refcount, i,e, we can consider it
>> as reserved_pfn,
>> Paolo?
>
> nVidia provided me (offlist) with a simple patch that modified VFIO to
> exhibit the problem, and it didn't use reserved PFNs. This is why the
> commit message for the patch is not entirely accurate.
>
It's clear now.
> But apart from this, it's much more obvious to consider the refcount.
> The x86 MMU code doesn't care if the page is reserved or not;
> mmu_set_spte does a kvm_release_pfn_clean, hence it makes sense for
> hva_to_pfn_remapped to try doing a get_page (via kvm_get_pfn) after
> invoking the fault handler, just like the get_user_pages family of
> function does.
Well, it's little strange as you always try to get refcont
for a PFNMAP region without MIXEDMAP which indicates all the memory
in this region is no 'struct page' backend.
But it works as kvm_{get, release}_* have already been aware of
reserved_pfn, so i am okay with it......
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[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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