[PATCH 2/4] ppc/spapr: Implement mce injection

[Nicholas Piggin]

This implements mce injection for spapr.

  (qemu) mce 0 0x200000 0x80 0xdeadbeef 0

    Disabling lock debugging due to kernel taint
    MCE: CPU0: machine check (Severe) Host SLB Multihit DAR: 00000000deadbeef 
[Recovered]
    MCE: CPU0: machine check (Severe) Host SLB Multihit [Recovered]
    MCE: CPU0: PID: 495 Comm: a NIP: [0000000130ee07c8]
    MCE: CPU0: Initiator CPU
    MCE: CPU0: Unknown
[   71.567193] MCE: CPU0: NIP: [c0000000000d7f6c] plpar_hcall_norets+0x1c/0x28
[   71.567249] MCE: CPU0: Initiator CPU
[   71.567308] MCE: CPU0: Unknown

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 include/hw/ppc/spapr.h |  3 +++
 hw/ppc/spapr.c         | 54 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 5b5ba9ef77..d8f925a391 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -1015,6 +1015,9 @@ void spapr_init_all_lpcrs(target_ulong value, 
target_ulong mask);
 hwaddr spapr_get_rtas_addr(void);
 bool spapr_memory_hot_unplug_supported(SpaprMachineState *spapr);
 
+void spapr_mce_inject(CPUState *cs, uint64_t srr1_mask, uint32_t dsisr,
+                      uint64_t dar, bool recovered);
+
 void spapr_vof_reset(SpaprMachineState *spapr, void *fdt, Error **errp);
 void spapr_vof_quiesce(MachineState *ms);
 bool spapr_vof_setprop(MachineState *ms, const char *path, const char 
*propname,
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 40fdbd5d12..641b763836 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -89,6 +89,7 @@
 #include "hw/ppc/pef.h"
 
 #include "monitor/monitor.h"
+#include "qapi/qmp/qdict.h"
 
 #include <libfdt.h>
 
@@ -3584,6 +3585,56 @@ static void spapr_nmi(NMIState *n, int cpu_index, Error 
**errp)
     }
 }
 
+typedef struct MCEInjectionParams {
+    uint64_t srr1_mask;
+    uint32_t dsisr;
+    uint64_t dar;
+    bool recovered;
+} MCEInjectionParams;
+
+static void spapr_do_mce_on_cpu(CPUState *cs, run_on_cpu_data data)
+{
+    MCEInjectionParams *params = data.host_ptr;
+    PowerPCCPU *cpu = POWERPC_CPU(cs);
+    CPUPPCState *env = &cpu->env;
+    uint64_t srr1_mce_bits = PPC_BITMASK(42, 45) | PPC_BIT(36);
+
+    cpu_synchronize_state(cs);
+
+    env->spr[SPR_SRR0] = env->nip;
+    env->spr[SPR_SRR1] = (env->msr & ~srr1_mce_bits) |
+                         (params->srr1_mask & srr1_mce_bits);
+    if (params->dsisr) {
+        env->spr[SPR_DSISR] = params->dsisr;
+        env->spr[SPR_DAR] = params->dar;
+    }
+
+    spapr_mce_req_event(cpu, params->recovered);
+}
+
+static void spapr_mce(MCEState *m, const QDict *qdict, Error **errp)
+{
+    int cpu_index = qdict_get_int(qdict, "cpu_index");
+    uint64_t srr1_mask = qdict_get_int(qdict, "srr1_mask");
+    uint32_t dsisr = qdict_get_int(qdict, "dsisr");
+    uint64_t dar = qdict_get_int(qdict, "dar");
+    bool recovered = qdict_get_int(qdict, "recovered");
+    CPUState *cs;
+
+    cs = qemu_get_cpu(cpu_index);
+
+    if (cs != NULL) {
+        MCEInjectionParams params = {
+            .srr1_mask = srr1_mask,
+            .dsisr = dsisr,
+            .dar = dar,
+            .recovered = recovered,
+        };
+
+        run_on_cpu(cs, spapr_do_mce_on_cpu, RUN_ON_CPU_HOST_PTR(&params));
+    }
+}
+
 int spapr_lmb_dt_populate(SpaprDrc *drc, SpaprMachineState *spapr,
                           void *fdt, int *fdt_start_offset, Error **errp)
 {
@@ -4689,6 +4740,7 @@ static void spapr_machine_class_init(ObjectClass *oc, 
void *data)
     SpaprMachineClass *smc = SPAPR_MACHINE_CLASS(oc);
     FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(oc);
     NMIClass *nc = NMI_CLASS(oc);
+    MCEClass *mcec = MCE_CLASS(oc);
     HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
     PPCVirtualHypervisorClass *vhc = PPC_VIRTUAL_HYPERVISOR_CLASS(oc);
     XICSFabricClass *xic = XICS_FABRIC_CLASS(oc);
@@ -4743,6 +4795,7 @@ static void spapr_machine_class_init(ObjectClass *oc, 
void *data)
     smc->resize_hpt_default = SPAPR_RESIZE_HPT_ENABLED;
     fwc->get_dev_path = spapr_get_fw_dev_path;
     nc->nmi_monitor_handler = spapr_nmi;
+    mcec->mce_monitor_handler = spapr_mce;
     smc->phb_placement = spapr_phb_placement;
     vhc->cpu_in_nested = spapr_cpu_in_nested;
     vhc->deliver_hv_excp = spapr_exit_nested;
@@ -4810,6 +4863,7 @@ static const TypeInfo spapr_machine_info = {
     .interfaces = (InterfaceInfo[]) {
         { TYPE_FW_PATH_PROVIDER },
         { TYPE_NMI },
+        { TYPE_MCE },
         { TYPE_HOTPLUG_HANDLER },
         { TYPE_PPC_VIRTUAL_HYPERVISOR },
         { TYPE_XICS_FABRIC },
-- 
2.42.0