On Wed, Jan 06, 2021 at 11:20:33PM +0000, Sunil Muthuswamy wrote:

Linux has support for free page reporting now (36e66c554b5c) for
virtualized environment. On Hyper-V when virtually backed VMs are
configured, Hyper-V will advertise cold memory discard capability,
when supported. This patch adds the support to hook into the free
page reporting infrastructure and leverage the Hyper-V cold memory
discard hint hypercall to report/free these pages back to the host.

Signed-off-by: Sunil Muthuswamy <redacted>
Tested-by: Matheus Castello <matheus@castello.eng.br>

Reviewed-by: Wei Liu <wei.liu@kernel.org>