Chris Wright wrote: > [ resend, fixing email header, sorry for duplicate ] > > The default mode for device assignment is to rely on an IOMMU for > proper translations and a functioning device in the guest. The current > logic makes this requirement advisory, and simply disables the request > for IOMMU if one is not found on the host. This makes for a confused > user when the device assignment appears to work, but the device in the > guest is not functioning (I've seen about a half-dozen reports with > this failure mode). > > Change the logic such that the default requires the IOMMU. Period. > If the host does not have an IOMMU, device assignment will fail. > > This is a user visible change, however I think the current situation is > simply broken. > > And, of course, disabling the IOMMU requirement using the old: > > -pcidevice host=[addr],dma=none > > or the newer: > > -device pci-assign,host=[addr],iommu=0 > > will do what it always did (not require an IOMMU, and fail to work > properly). >
Avi, could you please cherry-pick this into 0.12-stable? I don't feel too eager getting 500 bug reports from people who try out device passthrough with disabled or no IOMMU. Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
