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dc60f2db39
Newer versions of Hyper-V allow reporting unused guest pages in chunks smaller than 2 Mbytes. Using smaller chunks allows reporting more unused guest pages, but with increased overhead in the finding the small chunks. To make this tradeoff configurable, use the existing page_reporting_order module parameter to control the reporting order. Drop and refine checks that restricted the minimun page reporting order to 2Mbytes size pages. Add appropriate checks to make sure the underlying Hyper-V versions support cold discard hints of any order (and not just starting from 9) Signed-off-by: Shradha Gupta <shradhagupta@linux.microsoft.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/1664517699-1085-3-git-send-email-shradhagupta@linux.microsoft.com Signed-off-by: Wei Liu <wei.liu@kernel.org>