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

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Date:	Thu, 30 Jun 2016 14:59:45 -0700
From:	Neo Jia <cjia@...dia.com>
To:	Paolo Bonzini <pbonzini@...hat.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 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.

Hi Paolo,

Thanks for the quick patches, I am in the middle of verifying them and will
report back asap.

Thanks,
Neo

> 
> KVM lacks support for this kind of non-linear VM_PFNMAP mapping, and these
> patches should fix this.
> 
> Thanks,
> 
> Paolo
> 
> Paolo Bonzini (2):
>   KVM: MMU: prepare to support mapping of VM_IO and VM_PFNMAP frames
>   KVM: MMU: try to fix up page faults before giving up
> 
>  mm/gup.c            |  1 +
>  virt/kvm/kvm_main.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++-----
>  2 files changed, 51 insertions(+), 5 deletions(-)
> 
> -- 
> 1.8.3.1
>