On 15/03/21 18:05, Tobin Feldman-Fitzthum wrote:
I can answer this part. I think this will actually be simpler than
with auxiliary vCPUs. There will be a separate pair of VM+vCPU file
descriptors within the same QEMU process, and some code to set up the
memory map using KVM_SET_USER_MEMORY_REGION.
However, the code to run this VM will be very small as the VM does not
have to do MMIO, interrupts, live migration (of itself), etc. It just
starts up and communicates with QEMU using a mailbox at a
predetermined address.
We've been starting up our Migration Handler via OVMF. I'm not sure if
this would work with a minimal setup in QEMU.
Yeah, the way to start up the migration handler would be completely
different, you'd have to do so very early (probably SEC).
Paolo
