On 01/18/2010 04:18 PM, Alexander Graf wrote:
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.
Makes sense. Marcelo is committing this week, though. -- error compiling committee.c: too many arguments to function -- 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
