On 08/18/2009 12:53 PM, Michael S. Tsirkin wrote:
I'm not hung up on PCI, myself. An idea that might help you get Avi on-board: do setup in userspace, over PCI. Negotiate hypercall support (e.g. with a PCI capability) and then switch to that for fastpath. Hmm?
Hypercalls don't nest well. When a nested guest issues a hypercall, you have to assume it is destined to the enclosing guest, so you can't assign a hypercall-capable device to a nested guest.
mmio and pio don't have this problem since the host can use the address to locate the destination.
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