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work around race in virtio serial console #27

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Merged
lmb merged 1 commit into from
Dec 1, 2025
Merged

work around race in virtio serial console #27

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5 changes: 4 additions & 1 deletion qemu.go
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Original file line number Diff line number Diff line change
Expand Up @@ -560,7 +560,10 @@ func (vios *virtioSerialPorts) Cmdline() []string {

args := []string{
// There seems to be an off by one error with max_ports.
"-device", fmt.Sprintf("virtio-serial,max_ports=%d", len(vios.Chardevs)+1),
//
// ioeventfd=off works around a weird race condition where writing to the serial
// console from inside the guest may get stuck waiting for a wakeup.
"-device", fmt.Sprintf("virtio-serial,max_ports=%d,ioeventfd=off", len(vios.Chardevs)+1),
}
for dev, name := range vios.Chardevs {
args = append(args,
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