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    SubjectRe: [PATCH V3 0/4] Fix kvm misconceives NVDIMM pages as reserved mmio
    On Thu 09-08-18 18:52:48, Zhang Yi wrote:
    > For device specific memory space, when we move these area of pfn to
    > memory zone, we will set the page reserved flag at that time, some of
    > these reserved for device mmio, and some of these are not, such as
    > NVDIMM pmem.
    >
    > Now, we map these dev_dax or fs_dax pages to kvm for DIMM/NVDIMM
    > backend, since these pages are reserved. the check of
    > kvm_is_reserved_pfn() misconceives those pages as MMIO. Therefor, we
    > introduce 2 page map types, MEMORY_DEVICE_FS_DAX/MEMORY_DEVICE_DEV_DAX,
    > to indentify these pages are from NVDIMM pmem. and let kvm treat these
    > as normal pages.
    >
    > Without this patch, Many operations will be missed due to this
    > mistreatment to pmem pages. For example, a page may not have chance to
    > be unpinned for KVM guest(in kvm_release_pfn_clean); not able to be
    > marked as dirty/accessed(in kvm_set_pfn_dirty/accessed) etc.
    >
    > V1:
    > https://lkml.org/lkml/2018/7/4/91
    >
    > V2:
    > https://lkml.org/lkml/2018/7/10/135
    >
    > V3:
    > [PATCH V3 1/4] Needs Comments.
    > [PATCH V3 2/4] Update the description of MEMORY_DEVICE_DEV_DAX: Jan
    > [PATCH V3 3/4] Acked-by: Jan in V2

    Hum, but it is not the the patch...

    Honza
    --
    Jan Kara <jack@suse.com>
    SUSE Labs, CR

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