On 20 June 2013 19:32, Christoffer Dall <christoffer.dall@xxxxxxxxxx> wrote: > Marc wrote: >> So there is just one thing we absolutely need to make sure here: no vcpu >> can run before they've all had their timer restored, and hence a stable >> cntvoff. Otherwise two vcpus will have a different view of time. >> >> Can we guarantee this? > Do we need to? User space is free to modify time and all sort of other > registers at any point during VM execution - it will just break the > guest that it's running. Note that QEMU will stop all CPUs before doing a migration or similar operation. However there is a monitor command to query the current CPU registers etc which won't try to stop the VM first. So we might try to read vcpu registers (though I hope we don't allow writing them). -- PMM _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
