On Thu, Apr 21, 2022 at 10:14 AM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > On 4/21/22 18:51, Peter Oskolkov wrote: > > Allow kvm-based VMMs to request KVM to pass a custom vmcall > > from the guest to the VMM in the host. > > > > Quite often, operating systems research projects and/or specialized > > paravirtualized workloads would benefit from a extra-low-overhead, > > extra-low-latency guest-host communication channel. > > You can use a memory page and an I/O port. It should be as fast as a > hypercall. You can even change it to use ioeventfd if an asynchronous > channel is enough, and then it's going to be less than 1 us latency. Thank you for the suggestion. Let me try that. Thanks, Peter [...]
