On 08/18/2009 01:09 PM, Michael S. Tsirkin wrote:

mmio and pio don't have this problem since the host can use the address
to locate the destination.
So userspace could map hypercall to address during setup and tell the
host kernel?

Suppose a nested guest has two devices. One a virtual device backed by its host (our guest), and one a virtual device backed by us (the real host), and assigned by the guest to the nested guest. If both devices use hypercalls, there is no way to distinguish between them.

--
error compiling committee.c: too many arguments to function

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