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cloud-hypervisor/virtio-devices
Anatol Belski 90b9481745 virtio-devices: Bump config_generation on device config read
Set a config_changed flag in VirtioInterruptMsix when a Config
interrupt fires, and increment config_generation only when the
driver next reads the device specific configuration region. The
flag is cleared by that read so the driver observes a stable
value across the read and a fresh value on any later read.

This avoids the wrap hazard of incrementing on every Config
event, where a burst of interrupts could roll the 8 bit counter
back to its previous value between two driver reads.

Signed-off-by: Anatol Belski <anbelski@linux.microsoft.com>
2026-05-11 20:17:40 +00:00
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