Wolfgang Nothdurft wrote: > Hi, > > what limits does kvm have with device assignment and vt-d enabled. > > - Is it possible to assign pci devices behind the same pci bridge to > different guests? For devices behind conventional PCI bridges, the source-id in the DMA requests is the requester-id of the bridge device. For devices behind PCI Express-to-PCI/PCI-X bridges, the source-id possibly is the source-id of the original PCI-X transaction or the source-id provided by the bridge. So devices behind these bridges can only be collectively assigned to a single guest. > - Is there a limit how many devices can be assigned to one guest? VT-d doesn't have the limitation. kvm guest supports 32 devices. > - What kind of cards work with the dma=none option? dma=none implements DMA remapping using software method. I think it needn't depend on device. You can refer to Amit's pv-dma tree for more information. Regards, Weidong -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
