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virtio-balloon: Provide an interface for free page reporting

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Add support for free page reporting. The idea is to function very similar
to how the balloon works in that we basically end up madvising the page as
not being used. However we don't really need to bother with any deflate
type logic since the page will be faulted back into the guest when it is
read or written to.

This provides a new way of letting the guest proactively report free
pages to the hypervisor, so the hypervisor can reuse them. In contrast to
inflate/deflate that is triggered via the hypervisor explicitly.

Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Message-Id: <20200527041407.12700.73735.stgit@localhost.localdomain>
This commit is contained in:
Alexander Duyck 2020-05-26 21:14:07 -07:00 • committed by Michael S. Tsirkin
parent 7483cbbaf8
commit 91b867191d
2 changed files with 73 additions and 1 deletions
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2
include/hw/virtio/virtio-balloon.h
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@ -42,7 +42,7 @@ enum virtio_balloon_free_page_report_status {
typedef struct VirtIOBalloon {
VirtIODevice parent_obj;
VirtQueue *ivq, *dvq, *svq, *free_page_vq;
VirtQueue *ivq, *dvq, *svq, *free_page_vq, *reporting_vq;
uint32_t free_page_report_status;
uint32_t num_pages;
uint32_t actual;