Re: [PATCH v5 0/2] KVM: MMU: fix kvm_is_mmio_pfn()

[Xiao Guangrong]

On 11/08/2017 03:56 PM, Haozhong Zhang wrote:
> Some reserved pages, such as those from NVDIMM DAX devices, are not
> for MMIO, and can be mapped with cached memory type for better
> performance. However, the above check misconceives those pages as
> MMIO.  Because KVM maps MMIO pages with UC memory type, the
> performance of guest accesses to those pages would be harmed.
> Therefore, we check the host memory type in addition and only treat
> UC/UC- pages as MMIO.

Reviewed-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxx>