On Mon, Nov 13, 2023 at 3:20 PM David Stevens <steve...@chromium.org> wrote: > > The virtio spec currently does not include the concept of device power > management. The lack means that there is no good action drivers can take > when they are requested to put the device into a low power state (e.g. > when a guest is entering a system-wide low power state like S0ix/S3). > Stateless devices can be handled - albeit inefficiently - by resetting > and reinitialzing the device. However, stateful devices cannot support > this situation. This patch defines a low power mode for devices that can > be used in this situation. > > Low power mode is mostly defined at the transport layer, and all > device-side power optimizations are optional. This avoids the need for > invasive device-by-device definitions. It also pushes the requirement > onto the device side, to simplify what driver side changes are > necessary to just [1]. > > I believe this patch may address the virtio-gpu issue which [2] is > trying to address by avoiding the reset altogether when the guest enters > S3. > > [1] > https://lore.kernel.org/lkml/20231113055138.117392-1-steve...@chromium.org/ > [2] https://lore.kernel.org/lkml/20230919114242.2283646-1-jiqian.c...@amd.com/ > > v1 -> v2: > - Define virtio-pci support on top of PCI power management. > - Add more conformance requirements.
Friendly ping, and directly CC'ing reviewers. -David --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscr...@lists.oasis-open.org For additional commands, e-mail: virtio-dev-h...@lists.oasis-open.org
