From b7636afd9715748396325ec4dd0899c7f42ece17 Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Tue, 29 Sep 2026 15:34:18 -0400
Subject: sema-svc: apply releases before push memsets; poller: bypass read
 cache

---
 tools/guest-diag/semfix_uvmt.py  | 8 ++++----
 tools/guest-diag/semfix_watch.py | 7 ++++---
 2 files changed, 8 insertions(+), 7 deletions(-)

(limited to 'tools')

diff --git a/tools/guest-diag/semfix_uvmt.py b/tools/guest-diag/semfix_uvmt.py
index fb0e92e..02d4f9e 100755
--- a/tools/guest-diag/semfix_uvmt.py
+++ b/tools/guest-diag/semfix_uvmt.py
@@ -109,21 +109,21 @@ def uvmt_state(q, sem):
     cpu_va + idx*4 (its GPU alias is gpu_va + idx*4, the VA the releasing push
     writes).
     """
-    vals = q.read64(sem, 12)
+    vals = q.read64(sem, 12, cache=False)
     if len(vals) < 2 or not is_kern(vals[0]):
         return None
-    pv = q.read64(vals[0])
+    pv = q.read64(vals[0], cache=False)
     if not pv or not is_kern(pv[0]):
         return None
     mem = pv[0]
-    vas = q.read64(mem + 0x10, 16)
+    vas = q.read64(mem + 0x10, 16, cache=False)
     cpu = next((v for v in vas if is_kern(v)), None)
     gpu = [v for v in vas if is_gpu(v)]
     idx = vals[1] & 0xffff
     payload = None
     word_pa = None
     if cpu is not None:
-        w = q.read64(cpu + idx * 4)
+        w = q.read64(cpu + idx * 4, cache=False)
         payload = w[0] if w else None
         word_pa = q.gva2gpa(cpu + idx * 4)
     word_va = (gpu[0] + idx * 4) if gpu else None
diff --git a/tools/guest-diag/semfix_watch.py b/tools/guest-diag/semfix_watch.py
index 1fc6b01..1c33de6 100644
--- a/tools/guest-diag/semfix_watch.py
+++ b/tools/guest-diag/semfix_watch.py
@@ -96,16 +96,17 @@ class Qmp:
     def hmp(self, line):
         return self.cmd("human-monitor-command", **{"command-line": line}).get("return", "")
 
-    def read64(self, addr, n=1):
+    def read64(self, addr, n=1, cache=True):
         key = (addr, n)
-        if key in self._cache:
+        if cache and key in self._cache:
             return self._cache[key]
         out = self.hmp("x/%dgx 0x%x" % (n, addr))
         m = re.search(r":(.*)$", out, re.S)
         if not m:
             return []
         vals = [int(x, 16) for x in re.findall(r"0x([0-9a-fA-F]+)", m.group(1))][:n]
-        self._cache[key] = vals
+        if cache:
+            self._cache[key] = vals
         return vals
 
     def gva2gpa(self, va):
-- 
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