On 8 December 2014 at 09:16, Bharata B Rao <bharata....@gmail.com> wrote: > So this approach of parking the vcpu fd in QEMU and reusing it next > time during CPU hotplug will only work if all architectures supported > by KVM driver are ok with reuse of vcpu object in the kernel. I am > using relevant bits of this patch of yours with PowerPC architecture > to support cpu unplug and I realize that there is at least one case > where reuse of vcpu object in the kernel causes problems. Before I > attempt to fix that in ppc KVM, I wanted to check if there is > consensus on this approach (parking and reusing kvm vcpu fd) in QEMU.
For ARM we've just clarified the kernel-to-userspace ABI, and among other things it says you can't reuse the VCPU unless it's for exactly the same CPU type and feature configuration. So I'm not sure this park-and-reuse approach will work... -- PMM
