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When a machine is first booted, all virtio balloon stats are initialized to their default value -1 (18446744073709551615 when represented as unsigned). They remain that way while the firmware is loading, and early phase of guest OS boot, until the virtio-balloon driver is activated. Thereafter the reported stats reflect the guest OS activity. When a machine reset is performed, however, the virtio-balloon stats are left unchanged by QEMU, despite the guest OS no longer updating them, nor indeed even still existing. IOW, the mgmt app keeps getting stale stats until the guest OS starts once more and loads the virtio-balloon driver (if ever). At that point the app will see a discontinuity in the reported values as they sudden jump from the stale value to the new value. This jump is indigituishable from a valid data update. While there is an "last-updated" field to report on the freshness of the stats, that does not unambiguously tell the mgmt app whether the stats are still conceptually relevant to the current running workload. It is more conceptually useful to reset the stats to their default values on machine reset, given that the previous guest workload the stats reflect no longer exists. The mgmt app can now clearly identify that there are is no stats information available from the current executing workload. The 'last-updated' time is also reset back to 0. IOW, on every machine reset, the virtio stats are in the same clean state they were when the macine first powered on. A functional test is added to validate this behaviour with a real world guest OS. Signed-off-by: Daniel P. Berrangé <berrange@redhat.com> Message-Id: <20250204094202.2183262-1-berrange@redhat.com> Acked-by: David Hildenbrand <david@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> |
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| authz | ||
| block | ||
| chardev | ||
| crypto | ||
| disas | ||
| exec | ||
| fpu | ||
| gdbstub | ||
| hw | ||
| io | ||
| libdecnumber | ||
| migration | ||
| monitor | ||
| net | ||
| qapi | ||
| qemu | ||
| qom | ||
| scsi | ||
| semihosting | ||
| standard-headers | ||
| system | ||
| tcg | ||
| ui | ||
| user | ||
| elf.h | ||
| glib-compat.h | ||
| qemu-io.h | ||
| qemu-main.h | ||