On 02/10/2010 02:41 PM, Richard Henderson wrote:
On 02/10/2010 11:29 AM, Anthony Liguori wrote:
void *pci_memory_map(PCIDevice *dev, pcibus_t addr, pcibus_t *plen, int
is_write);
void pci_memory_unmap(PCIDevice *dev, void *buf, pcibus_t *plen, int
is_write, pcibus_t access_len);
Are these functions intended to be controllable by the root bus
object? It would be awfully nice if we would design in a hook that
allowed iommu mapping to be done properly.
Yes, that's the point. For something like virtio, you would have a call
chain like:
virtio_memory_map -> pci_memory_map -> sysbus_memory_map[1] ->
cpu_memory_map.
Each layer has the ability to do things like implement iommu mapping.
[1] I think it might make sense to have a sysbus layer but I'm not 100%
sure yet.
Regards,
Anthony Liguori
r~
