Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed
From: Neo Jia
Date: Thu Jun 30 2016 - 18:05:51 EST
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
>