linux-kernel - Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn

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Message-ID: <fc22ad5a-5f47-458c-63db-b80e8ce96d99@redhat.com>
Date:	Tue, 5 Jul 2016 14:18:28 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Neo Jia <cjia@...dia.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Kirti Wankhede <kwankhede@...dia.com>,
	Xiao Guangrong <guangrong.xiao@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Radim Krčmář <rkrcmar@...hat.com>
Subject: Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed



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.

Paolo