From b90b9ecb12ae37c089d1a837d8ff2c888d71902e Mon Sep 17 00:00:00 2001 From: Nicholas Piggin Date: Thu, 26 Mar 2020 00:29:05 +1000 Subject: [PATCH] ppc/spapr: Add FWNMI machine check delivery warnings Add some messages which explain problems and guest misbehaviour that may be difficult to diagnose in rare cases of machine checks. Signed-off-by: Nicholas Piggin Message-Id: <20200325142906.221248-4-npiggin@gmail.com> Reviewed-by: Greg Kurz Signed-off-by: David Gibson --- hw/ppc/spapr_events.c | 4 ++++ hw/ppc/spapr_rtas.c | 3 +++ 2 files changed, 7 insertions(+) diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c index a908c5d0e9..c8964eb25d 100644 --- a/hw/ppc/spapr_events.c +++ b/hw/ppc/spapr_events.c @@ -833,6 +833,8 @@ static void spapr_mce_dispatch_elog(PowerPCCPU *cpu, bool recovered) /* get rtas addr from fdt */ rtas_addr = spapr_get_rtas_addr(); if (!rtas_addr) { + error_report( +"FWNMI: Unable to deliver machine check to guest: rtas_addr not found."); qemu_system_guest_panicked(NULL); g_free(ext_elog); return; @@ -874,6 +876,8 @@ void spapr_mce_req_event(PowerPCCPU *cpu, bool recovered) * that CPU called "ibm,nmi-interlock") */ if (spapr->fwnmi_machine_check_interlock == cpu->vcpu_id) { + error_report( +"FWNMI: Unable to deliver machine check to guest: nested machine check."); qemu_system_guest_panicked(NULL); return; } diff --git a/hw/ppc/spapr_rtas.c b/hw/ppc/spapr_rtas.c index 29abe66d01..bcac0d00e7 100644 --- a/hw/ppc/spapr_rtas.c +++ b/hw/ppc/spapr_rtas.c @@ -462,6 +462,9 @@ static void rtas_ibm_nmi_interlock(PowerPCCPU *cpu, } if (spapr->fwnmi_machine_check_addr == -1) { + qemu_log_mask(LOG_GUEST_ERROR, +"FWNMI: ibm,nmi-interlock RTAS called with FWNMI not registered.\n"); + /* NMI register not called */ rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR); return;