Han, Weidong wrote:
Avi Kivity wrote:
Han, Weidong wrote:
Don't need to map mmio pages for iommu. When find mmio pages in
kvm_iommu_map_pages(), don't map them, and shouldn't return error
due to it's not an error. If return error (such as -EINVAL), device
assigment will fail.
I don't understand. Why don't we need to map mmio pages? We
certainly don't want them emulated.
mmio pages need not to be mapped in VT-d page table, which only
translate DMA addresses.
Right, I forgot the iommu is only for dma, not cpu accesses.
I suppose one could DMA into an mmio page. Is there a reason not to map?
--
error compiling committee.c: too many arguments to function
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