On Mon, Nov 13, 2023 at 03:19:49PM +0900, David Stevens 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].
Great idea. This couldn't have come at a better time, too. Please do remember to CC reviewers directly in the future, though. > 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. > > David Stevens (1): > Define a low power mode for devices > > content.tex | 45 +++++++++++++++++++++++++++++++++++++++++++++ > transport-pci.tex | 7 +++++++ > 2 files changed, 52 insertions(+) > > -- > 2.42.0.869.gea05f2083d-goog > > > This publicly archived list offers a means to provide input to the > OASIS Virtual I/O Device (VIRTIO) TC. > > In order to verify user consent to the Feedback License terms and > to minimize spam in the list archive, subscription is required > before posting. > > Subscribe: virtio-comment-subscr...@lists.oasis-open.org > Unsubscribe: virtio-comment-unsubscr...@lists.oasis-open.org > List help: virtio-comment-h...@lists.oasis-open.org > List archive: https://lists.oasis-open.org/archives/virtio-comment/ > Feedback License: https://www.oasis-open.org/who/ipr/feedback_license.pdf > List Guidelines: https://www.oasis-open.org/policies-guidelines/mailing-lists > Committee: https://www.oasis-open.org/committees/virtio/ > Join OASIS: https://www.oasis-open.org/join/ > --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscr...@lists.oasis-open.org For additional commands, e-mail: virtio-dev-h...@lists.oasis-open.org
