On 8 July 2015 at 17:37, Marc Zyngier <marc.zyngier@xxxxxxx> wrote: > On 08/07/15 17:06, Peter Maydell wrote: >> I'd prefer it if somebody could investigate to see why QEMU >> is actually doing this -- so far we just have speculation. > > I'd prefer that too, but so far people seem to be more comfortable > waiting for the issue to fix itself. In the meantime, VMs are broken in > weird and wonderful ways, and I don't think the current status-quo helps > anyone. Putting in a patch which might not be the right fix isn't necessarily a good plan either... Does has_run_once get cleared if we do a re-VCPU_INIT of a CPU that's run before? (We need to allow rewriting of guest state at that point so that "reset VM and load migration state" behaves correctly.) I suspect Jan is right and we really need to distinguish the KVM_PUT_*_STATE levels in ARM QEMU. This probably implies some kind of whitelist/override mechanism, since by and large we neither know nor want to know the semantics for system registers, we leave that up to the kernel. Q: if you have a running VM, and you pause it for an hour, what should the CNTVCT register do? Presumably it should not advance, but how do we arrange for that to happen? -- PMM _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
