virtio-balloon driver #1439
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virtio-balloon driver #1439
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This adds a driver for the virtio-balloon device, allowing the hypervisor/monitor to manage the memory footprint of a VM instance by inflating and deflating balloon pages. The driver responds to changes applied to the balloon device's PCI config space, which is managed by registration of a handler via a newly-added vtpci_register_config_change_handler interface. An interface has also been added to allow mm_service() to deflate balloon pages when memory resources are at a minimum. To accommodate config change interrupts for non-MSIX platforms, the non-MSIX vtpci interrupt handler is registered only once per device and, upon invocation, dispatches queue and config change handlers based on pending bits in the ISR status register.
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Looks okay to me! |
…nnot be fully met on inflation, and add some simple usage documentation
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This adds a driver for the virtio-balloon device, allowing the monitor to manage the memory footprint of a Nanos instance by inflating and deflating balloon pages. The driver responds to changes applied to the balloon device's PCI config space, which is managed by registration of a handler via a newly-added vtpci_register_config_change_handler interface. An interface has also been added to allow mm_service() to deflate balloon pages when memory resources are at a minimum.
To accommodate config change interrupts for non-MSIX platforms, the non-MSIX vtpci interrupt handler is now registered only once per device and, upon invocation, dispatches queue and config change handlers based on pending bits in the ISR status register.
This driver supports the "statsq," if offered by the device, which reports memory usage, page faults and pagecache usage to the monitor when requested.
Resolves #660