x86/Hyper-V: Support for free page reporting

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Linux has support for free page reporting now (36e66c554b) 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 <sunilmut@microsoft.com>
Tested-by: Matheus Castello <matheus@castello.eng.br>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/SN4PR2101MB0880121FA4E2FEC67F35C1DCC0649@SN4PR2101MB0880.namprd21.prod.outlook.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>

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This commit is contained in:

Sunil Muthuswamy 2021-03-23 18:47:16 +00:00 • committed by Wei Liu

parent 1b60280834

commit 6dc2a774cb

6 changed files with 180 additions and 8 deletions

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35

include/asm-generic/hyperv-tlfs.h

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3

include/asm-generic/mshyperv.h

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