On Mon, Aug 01, 2011 at 02:27:36PM -0600, Alex Williamson wrote: > It's not clear to me how we could skip it. With VT-d, we'd have to > implement an emulated interrupt remapper and hope that the guest picks > unused indexes in the host interrupt remapping table before it could do > anything useful with direct access to the MSI-X table. Maybe AMD IOMMU > makes this easier? AMD IOMMU provides remapping tables per-device, and not a global one. But that does not make direct guest-access to the MSI-X table safe. The table contains the table contains the interrupt-type and the vector which is used as an index into the remapping table by the IOMMU. So when the guest writes into its MSI-X table the remapping-table in the host needs to be updated too. Joerg -- 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
