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authorAlex Williamson <alex.williamson@redhat.com>2015-04-07 11:14:46 -0600
committerAlex Williamson <alex.williamson@redhat.com>2015-04-07 11:14:46 -0600
commit6eb7018705de09b4138ca05d6a157203e0ea791a (patch)
tree3febc7c9c86ca1ec65c57529501f70c26d9322ba /drivers/Makefile
parent561d72ddbbe480e2cae6c1a63c688986586ef2b1 (diff)
vfio-pci: Move idle devices to D3hot power state
We can save some power by putting devices that are bound to vfio-pci but not in use by the user in the D3hot power state. Devices get woken into D0 when opened by the user. Resets return the device to D0, so we need to re-apply the low power state after a bus reset. It's tempting to try to use D3cold, but we have no reason to inhibit hotplug of idle devices and we might get into a loop of having the device disappear before we have a chance to try to use it. A new module parameter allows this feature to be disabled if there are devices that misbehave as a result of this change. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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