Re: [libvirt] [PATCHv3] pci: new iommu_group functions

Any device which belongs to an "IOMMU group" (used by vfio) will have links to all devices of its group listed in /sys/bus/pci/$device/iommu_group/devices; /sys/bus/pci/$device/iommu_group is actually a link to /sys/kernel/iommu_groups/$n, where $n is the group number (there will be a corresponding device node at /dev/vfio/$n once the devices are bound to the vfio-pci driver) The following functions are added: virPCIDeviceGetIOMMUGroupList Gets a virPCIDeviceList with one virPCIDeviceList for each device in the same IOMMU group as the provided virPCIDevice (a copy of the original device object is included in the list. virPCIDeviceAddressIOMMUGroupIterate Calls the function @actor once for each device in the group that contains the given virPCIDeviceAddress. virPCIDeviceAddressGetIOMMUGroupAddresses Fills in a virPCIDeviceAddressPtr * with an array of virPCIDeviceAddress, one for each device in the iommu group of the provided virPCIDeviceAddress (including a copy of the original). virPCIDeviceAddressGetIOMMUGroupNum Returns the group number as an int (a valid group number will always be 0 or greater). If there is no iommu_group link in the device's directory (usually indicating that vfio isn't loaded), -2 will be returned. On any real error, -1 will be returned. --- changes from v2: 1) rename functions for consistency 2) set errno=0 prior to each call to readdir, and check for non-zero errno at the end. 3) remove some braces. Everything else in the series of 12 was ACKed, and all but this and the patch that adds the <iommuGroup> element to the nodedev-dumpxml output have been pushed. src/libvirt_private.syms | 4 + src/util/virpci.c | 223 +++++++++++++++++++++++++++++++++++++++++++++++ src/util/virpci.h | 15 +++- 3 files changed, 239 insertions(+), 3 deletions(-)