On Wed, Jun 09, 2021 at 11:29:15AM -0700, Vivek Kasireddy wrote:
If the VMM's (Qemu) memory backend is backed up by memfd + Hugepages (hugetlbfs and not THP), we have to first find the hugepage(s) where the Guest allocations are located and then extract the regular 4k sized subpages from them.
v2: Ensure that the subpage and hugepage offsets are calculated correctly when the range of subpage allocations cuts across multiple hugepages.
v3: Instead of repeatedly looking up the hugepage for each subpage, only do it when the subpage allocation crosses over into a different hugepage. (suggested by Gerd and DW)
v4: Fix the following warning identified by checkpatch: CHECK:OPEN_ENDED_LINE: Lines should not end with a '('
Cc: Gerd Hoffmann kraxel@redhat.com Signed-off-by: Vivek Kasireddy vivek.kasireddy@intel.com Signed-off-by: Dongwon Kim dongwon.kim@intel.com
hpage = find_get_page_flags(mapping,pgoff, FGP_ACCESSED);
checkpatch is still not happy. Fixed that up & pushed to drm-misc-next.
thanks, Gerd