On Wed, 2014-08-20 at 16:39 +0530, Sreekanth Reddy wrote: > HI, > > For SRIOV support, currently in the KVM environment, mpt3sas driver > can use the API pci_vfs_assigned() to know the number of VFs that are > currently assigned to the running VMs. So that during the PF driver > unload time, if the return value of this API is greater than zero the > our driver won't call the pci_disable_sriov() to disable the VFs. > > Now for the same purpose in XEN environment, is there any API similar > to pci_vfs_assigned() which the low lever device driver can use to > know 'the number of VFs that are currently assigned to the running > VMs'. In XEN environment this API pci_vfs_assigned() will return > always zero even though VFs are assigned to the running VMs. Note that pci_vfs_assigned() assigned is only used by legacy KVM device assignment and primarily as a workaround for not using an actual host-based device driver to manage device ownership. When using VFIO-based device assignment with KVM, pci_vfs_assigned() is not updated. Please don't rely on this interface. Thanks, Alex -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
