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vmm: Enable guest to report free pages through virtio-balloon

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Adding a new parameter free_page_reporting=on|off to the balloon device
so that we can enable the corresponding feature from virtio-balloon.

Running a VM with a balloon device where this feature is enabled allows
the guest to report pages that are free from guest's perspective. This
information is used by the VMM to release the corresponding pages on the
host.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>
This commit is contained in:
Sebastien Boeuf
2022-02-10 14:47:33 +01:00
parent 414e8e068b
commit 052f38fa96
4 changed files with 20 additions and 2 deletions
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6
vmm/src/api/openapi/cloud-hypervisor.yaml
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@@ -800,7 +800,11 @@ components:
deflate_on_oom:
type: boolean
default: false
description: Whether the balloon should deflate when the guest is under memory pressure.
description: Deflate balloon when the guest is under memory pressure.
free_page_reporting:
type: boolean
default: false
description: Enable guest to report free pages.
FsConfig:
required: