HDEC is defined to not wake from PM state. There is a check in the HDEC
timer to avoid setting the interrupt if we are in a PM state, but no
check on PM entry to lower HDEC if it already fired. This can cause a
HDECR wake up and QEMU abort with unsupported exception in Power Save
mode.
Fixes: 4b236b621bf ("ppc: Initial HDEC support")
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
target/ppc/excp_helper.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index 003805b202..9aa8e46566 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -2685,6 +2685,12 @@ void helper_pminsn(CPUPPCState *env, uint32_t insn)
env->resume_as_sreset = (insn != PPC_PM_STOP) ||
(env->spr[SPR_PSSCR] & PSSCR_EC);
+ /* HDECR is not to wake from PM state, it may have already fired */
+ if (env->resume_as_sreset) {
+ PowerPCCPU *cpu = env_archcpu(env);
+ ppc_set_irq(cpu, PPC_INTERRUPT_HDECR, 0);
+ }
+
ppc_maybe_interrupt(env);
}
#endif /* defined(TARGET_PPC64) */
--
2.40.1
