Anthony Liguori wrote:
I think the current VT-d code needs some reworking.
We should build the table as the shadow page table gets built. We
should suppress iotlb flushes unless the table is actually being updated.
We can't, since we need the iommu tables populated before we issue any dma.
Perhaps we want something like MAP_POPULATE for shadow, which would then
affect the iommu tables. Userspace would then do:
mlock()
... set up device assignment
ioctl(..., KVM_POPULATE)
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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