From ba7a2b0757dc9a22e893ebe4c71c07878ec0842d Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Tue, 29 Sep 2026 13:17:33 -0400
Subject: guest-diag: bound pushbuffer fallback scan (400 candidates / 30s)

---
 tools/guest-diag/semfix_watch.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'tools')

diff --git a/tools/guest-diag/semfix_watch.py b/tools/guest-diag/semfix_watch.py
index 93302cc..0de5cad 100644
--- a/tools/guest-diag/semfix_watch.py
+++ b/tools/guest-diag/semfix_watch.py
@@ -157,7 +157,11 @@ def resolve_pushbuffer(q, sem):
         if gpa:
             return gpu_vas, cpu, gpa
     # Chain 2: value is the pushbuffer itself; +8 = rm_mem.
-    for V in cands:
+    # Two QMP reads per candidate, so cap the scan (bounded in time).
+    deadline = time.time() + 30
+    for V in cands[:400]:
+        if time.time() > deadline:
+            break
         mem = q.read64(V + 8)
         if not mem or not is_kern(mem[0]):
             continue
-- 
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