From da695e7927076d4a99abad5c06ec687674f475ca Mon Sep 17 00:00:00 2001
From: Paul Mackerras <paulus@ozlabs.org>
Date: Fri, 10 Oct 2025 10:31:43 +1100
Subject: [PATCH] execute1: Fix bug where LPCR[HEIC] disabled interrupts in
 problem state (#453)

LPCR[HEIC] should only disable external interrupts in hypervisor mode,
and not in problem state (user mode).  This fixes the expression for
irq_valid to do that.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
---
 execute1.vhdl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/execute1.vhdl b/execute1.vhdl
index 43831f3..15d5333 100644
--- a/execute1.vhdl
+++ b/execute1.vhdl
@@ -1749,7 +1749,7 @@ begin
 
         irq_valid := ex1.msr(MSR_EE) and
                      (pmu_to_x.intr or dec_sign or dhd_pending or
-                      (ext_irq_in and not ctrl.lpcr_heic));
+                      (ext_irq_in and (not ctrl.lpcr_heic or ex1.msr(MSR_PR))));
 
         if valid_in = '1' then
             v.prev_op := e_in.insn_type;