A write of a zero to VTCFG_R_STATUS initiates a virtio device reset via vc_reset. Typically this means a call to vi_reset_dev() which resets a bunch of fields in virtio_softc, but does not touch a corresponding pci_devinst (hanging off vs_pi) at all. Among other things this means that PCI MSI and MSI-X states remain unchanged. One of the consequences is that we keep using virtio_config_size of 24 if MSI-X is enabled.
Should the virtio status reset also reset the PCI state? One practical problem that I see is with illumos fast reboot where the illumos virtio driver assumes that the status reset is sufficient to return a device to a state like after a clean (full) reboot. Thank you. -- Andriy Gapon _______________________________________________ freebsd-virtualization@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
