At 03/15/2012 07:46 PM, Avi Kivity Wrote: > On 03/15/2012 01:25 PM, Jan Kiszka wrote: >>>> >>> There was such vm exit (KVM_EXIT_HYPERCALL), but it was deemed to be a >>> bad idea. >> >> BTW, this would help a lot in emulating hypercalls of other hypervisors >> (or of KVM's VAPIC in the absence of in-kernel irqchip - I had to jump >> through hoops therefore) in user space. Not all those hypercall handlers >> actually have to reside in the KVM module. >> > > That is true. On the other hand the hypercall ABI might go to pieces if > there was no central implementation. >
I prefer this: host <-> guest kernel: use hypercall host <-> guest userspace: use virtio-serial(or other way that not modify kernel) Thanks Wen Congyang
