A context should be 'valid' when pulled from the thread interrupt
context registers.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 hw/intc/xive.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/intc/xive.c b/hw/intc/xive.c
index cdc4ea8b0e51..07b7c3586c12 100644
--- a/hw/intc/xive.c
+++ b/hw/intc/xive.c
@@ -362,6 +362,11 @@ static uint64_t xive_tm_pull_os_ctx(XivePresenter *xptr, XiveTCTX *tctx,
 
     xive_os_cam_decode(cam, &nvt_blk, &nvt_idx, &vo);
 
+    if (!vo) {
+        qemu_log_mask(LOG_GUEST_ERROR, "XIVE: pulling invalid NVT %x/%x !?\n",
+                      nvt_blk, nvt_idx);
+    }
+
     /* Invalidate CAM line */
     qw1w2_new = xive_set_field32(TM_QW1W2_VO, qw1w2, 0);
     memcpy(&tctx->regs[TM_QW1_OS + TM_WORD2], &qw1w2_new, 4);
-- 
2.21.0