Monorepo for Tangled
tangled.org
spindle/microvm: poll qemu running status, and parse query-status strictly
Signed-off-by: dawn <dawn@tangled.org>
author
dawn
date
(Jun 22, 2026, 7:55 PM +0300)
commit
200d4f0b
200d4f0b70b33a4909b4bfee5721c5bad06d7706
parent
d67b91ef
d67b91ef4b1cca4c0c4d6e14b2a006343739cfa9
change-id
rqsssssl
rqssssslmvqklmnuywmqtslwysmkrvoo
+51
-7
+51
-7
spindle/engines/microvm/qemu.go
+51
-7
spindle/engines/microvm/qemu.go
···
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if qmpTimeout == 0 {
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qmpTimeout = defaultQMPTimeout
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}
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-
if err := handle.waitForQMP(ctx, qmpTimeout); err != nil {
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qmpCtx, cancelQMP := context.WithTimeout(ctx, qmpTimeout)
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defer cancelQMP()
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if err := handle.waitForQMP(qmpCtx, qmpTimeout); err != nil {
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return nil, err
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}
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-
status, err := handle.QMPQueryStatus()
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+
status, err := handle.waitForQMPRunning(qmpCtx, qmpTimeout)
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if err != nil {
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return nil, err
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-
}
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if status != "running" {
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return nil, fmt.Errorf("qemu guest not running (status: %s)", status)
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}
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logger.Info("qemu microvm running", "cid", cid, "status", status)
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···
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}
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var resp struct {
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-
Return struct {
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+
Return *struct {
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Status string `json:"status"`
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} `json:"return"`
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}
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if err := json.Unmarshal(raw, &resp); err != nil {
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return "", fmt.Errorf("qmp query-status parse: %w", err)
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return "", fmt.Errorf("qmp query-status parse %q: %w", raw, err)
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}
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if resp.Return == nil {
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return "", fmt.Errorf("qmp query-status missing return: %s", raw)
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}
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if resp.Return.Status == "" {
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return "", fmt.Errorf("qmp query-status missing return.status: %s", raw)
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}
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return resp.Return.Status, nil
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}
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+
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func (h *QEMUVMHandle) waitForQMPRunning(ctx context.Context, timeout time.Duration) (string, error) {
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statusCtx, cancel := context.WithTimeout(ctx, timeout)
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defer cancel()
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+
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ticker := time.NewTicker(25 * time.Millisecond)
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defer ticker.Stop()
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+
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var lastStatus string
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var lastErr error
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+
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for {
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status, err := h.QMPQueryStatus()
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if err != nil {
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lastErr = err
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} else {
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lastErr = nil
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lastStatus = status
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+
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switch status {
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case "running":
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return status, nil
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case "shutdown", "internal-error", "io-error", "guest-panicked":
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return "", fmt.Errorf("qemu guest entered unhealthy state before running (status: %s)", status)
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}
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}
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+
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select {
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case <-statusCtx.Done():
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if lastErr != nil {
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return "", fmt.Errorf("qemu guest did not reach running state (last status: %s): %w", lastStatus, errors.Join(statusCtx.Err(), lastErr))
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}
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return "", fmt.Errorf("qemu guest did not reach running state (last status: %s): %w", lastStatus, statusCtx.Err())
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+
case <-h.done:
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return "", fmt.Errorf("qemu exited before reaching running state: %w", h.Wait())
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case <-ticker.C:
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}
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}
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}
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func (h *QEMUVMHandle) QMPSystemPowerdown() error {