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The 'spapr-pci-host-bridge' represents the virtual PCI host bridge (PHB) for a PAPR guest. Unlike on x86, it's routine on Power (both bare metal and PAPR guests) to have numerous independent PHBs, each controlling a separate PCI domain. There are two ways of configuring the spapr-pci-host-bridge device: first it can be done fully manually, specifying the locations and sizes of all the IO windows. This gives the most control, but is very awkward with 6 mandatory parameters. Alternatively just an "index" can be specified which essentially selects from an array of predefined PHB locations. The PHB at index 0 is automatically created as the default PHB. The current set of default locations causes some problems for guests with large RAM (> 1 TiB) or PCI devices with very large BARs (e.g. big nVidia GPGPU cards via VFIO). Obviously, for migration we can only change the locations on a new machine type, however. This is awkward, because the placement is currently decided within the spapr-pci-host-bridge code, so it breaks abstraction to look inside the machine type version. So, this patch delegates the "default mode" PHB placement from the spapr-pci-host-bridge device back to the machine type via a public method in sPAPRMachineClass. It's still a bit ugly, but it's about the best we can do. For now, this just changes where the calculation is done. It doesn't change the actual location of the host bridges, or any other behaviour. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Laurent Vivier <lvivier@redhat.com> |
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| block | ||
| crypto | ||
| disas | ||
| exec | ||
| fpu | ||
| hw | ||
| io | ||
| libdecnumber | ||
| migration | ||
| monitor | ||
| net | ||
| qapi | ||
| qemu | ||
| qom | ||
| standard-headers | ||
| sysemu | ||
| ui | ||
| elf.h | ||
| glib-compat.h | ||
| qemu-common.h | ||
| qemu-io.h | ||
| trace-tcg.h | ||
| trace.h | ||