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: https://lkml.org/lkml/2018/8/9/17 V4: [PATCH V3 1/4] Added "Reviewed-by: David / Acked-by: Pankaj" [PATCH V3 2/4] Added "Reviewed-by: Jan" [PATCH V3 3/4] Added "Acked-by: Jan" [PATCH V3 4/4] Fix several typos Zhang Yi (4): kvm: remove redundant reserved page check mm: introduce memory type MEMORY_DEVICE_DEV_DAX mm: add a function to differentiate the pages is from DAX device memory kvm: add a check if pfn is from NVDIMM pmem. drivers/dax/pmem.c | 1 + include/linux/memremap.h | 8 ++++++++ include/linux/mm.h | 12 ++++++++++++ virt/kvm/kvm_main.c | 16 ++++++++-------- 4 files changed, 29 insertions(+), 8 deletions(-) -- 2.7.4 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm
