ppc/pnv: Add support for NMI interface

This implements the NMI interface for the PNV machine, similarly to
commit 3431648272d ("spapr: Add support for new NMI interface") for
SPAPR.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-Id: <20200325144147.221875-3-npiggin@gmail.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
index c9cb6fa357f6b1b573c23b4dd7e265363af4e72f..a3b7a8d0ff32c9c0f7a9c0a64b73c2f505f044c2 100644 (file)
--- a/hw/ppc/pnv.c
+++ b/hw/ppc/pnv.c
@@ -27,6 +27,7 @@
 #include "sysemu/runstate.h"
 #include "sysemu/cpus.h"
 #include "sysemu/device_tree.h"
+#include "sysemu/hw_accel.h"
 #include "target/ppc/cpu.h"
 #include "qemu/log.h"
 #include "hw/ppc/fdt.h"
@@ -34,6 +35,7 @@
 #include "hw/ppc/pnv.h"
 #include "hw/ppc/pnv_core.h"
 #include "hw/loader.h"
+#include "hw/nmi.h"
 #include "exec/address-spaces.h"
 #include "qapi/visitor.h"
 #include "monitor/monitor.h"
@@ -1977,10 +1979,35 @@ static void pnv_machine_set_hb(Object *obj, bool value, Error **errp)
     }
 }
 
+static void pnv_cpu_do_nmi_on_cpu(CPUState *cs, run_on_cpu_data arg)
+{
+    PowerPCCPU *cpu = POWERPC_CPU(cs);
+    CPUPPCState *env = &cpu->env;
+
+    cpu_synchronize_state(cs);
+    ppc_cpu_do_system_reset(cs);
+    /*
+     * SRR1[42:45] is set to 0100 which the ISA defines as implementation
+     * dependent. POWER processors use this for xscom triggered interrupts,
+     * which come from the BMC or NMI IPIs.
+     */
+    env->spr[SPR_SRR1] |= PPC_BIT(43);
+}
+
+static void pnv_nmi(NMIState *n, int cpu_index, Error **errp)
+{
+    CPUState *cs;
+
+    CPU_FOREACH(cs) {
+        async_run_on_cpu(cs, pnv_cpu_do_nmi_on_cpu, RUN_ON_CPU_NULL);
+    }
+}
+
 static void pnv_machine_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
     InterruptStatsProviderClass *ispc = INTERRUPT_STATS_PROVIDER_CLASS(oc);
+    NMIClass *nc = NMI_CLASS(oc);
 
     mc->desc = "IBM PowerNV (Non-Virtualized)";
     mc->init = pnv_init;
@@ -1997,6 +2024,7 @@ static void pnv_machine_class_init(ObjectClass *oc, void *data)
     mc->default_ram_size = INITRD_LOAD_ADDR + INITRD_MAX_SIZE;
     mc->default_ram_id = "pnv.ram";
     ispc->print_info = pnv_pic_print_info;
+    nc->nmi_monitor_handler = pnv_nmi;
 
     object_class_property_add_bool(oc, "hb-mode",
                                    pnv_machine_get_hb, pnv_machine_set_hb,
@@ -2060,6 +2088,7 @@ static const TypeInfo types[] = {
         .class_size    = sizeof(PnvMachineClass),
         .interfaces = (InterfaceInfo[]) {
             { TYPE_INTERRUPT_STATS_PROVIDER },
+            { TYPE_NMI },
             { },
         },
     },