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From: | Anthony Liguori |
Subject: | Re: [Qemu-devel] [PATCH 0/15][RFC] New PCI interfaces |
Date: | Wed, 10 Feb 2010 15:13:29 -0600 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.5) Gecko/20091209 Fedora/3.0-4.fc12 Lightning/1.0pre Thunderbird/3.0 |
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~
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