WSL2-Linux-Kernel/drivers/virtio
Rusty Russell 6b35e40767 virtio: balloon driver
After discussions with Anthony Liguori, it seems that the virtio
balloon can be made even simpler.  Here's my attempt.

The device configuration tells the driver how much memory it should
take from the guest (ie. balloon size).  The guest feeds the page
numbers it has taken via one virtqueue.

A second virtqueue feeds the page numbers the driver wants back: if
the device has the VIRTIO_BALLOON_F_MUST_TELL_HOST bit, then this
queue is compulsory, otherwise it's advisory (and the guest can simply
fault the pages back in).

This driver can be enhanced later to deflate the balloon via a
shrinker, oom callback or we could even go for a complete set of
in-guest regulators.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2008-02-04 23:50:13 +11:00
..
Kconfig virtio: balloon driver 2008-02-04 23:50:13 +11:00
Makefile virtio: balloon driver 2008-02-04 23:50:13 +11:00
config.c Virtio interface 2007-10-23 15:49:54 +10:00
virtio.c virtio: Allow virtio to be modular and used by modules 2008-02-04 23:50:06 +11:00
virtio_balloon.c virtio: balloon driver 2008-02-04 23:50:13 +11:00
virtio_pci.c virtio: Use PCI revision field to indicate virtio PCI ABI version 2008-02-04 23:50:12 +11:00
virtio_ring.c virtio: Allow virtio to be modular and used by modules 2008-02-04 23:50:06 +11:00