Since Hyper-V always uses 4k pages, hv_balloon has some difficulties working on ARM64 with larger pages[1]. Besides the memory hot add messages of Hyper-V doesn't have the information of NUMA node id of the added memory range, and ARM64 currently doesn't provide the conversion from a physical address to a node id, as a result the hv_balloon driver couldn't handle hot add properly when there are more than one NUMA node. Among these issues, post_status() is easy to fix, while the unballoon issue and the hot-add issue requires more discussion. To make the hv_balloon driver work at the best effort, this patchset fixes the post_status() and temporarily disable the balloon and hot-add accordingly. Looking forwards to comments and suggestions. Regards, Boqun [1]: https://lore.kernel.org/lkml/20220105165028.1343706-1-vkuznets@xxxxxxxxxx/ Boqun Feng (2): Drivers: hv: balloon: Support status report for larger page sizes Drivers: hv: balloon: Disable balloon and hot-add accordingly drivers/hv/hv_balloon.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) -- 2.35.1
