[Qemu-devel] [RFC PATCH v2 16/21] spapr: add a XIVE object to the sPAPR machine

[Cédric Le Goater]

If the machine supports XIVE (POWER9 CPU), create a XIVE object. The
CAS negotiation process will decide which model (legacy or XIVE) will
be used for the interrupt controller depending on the guest
capabilities.

Also extend the number of provisionned IRQs with the number of CPUs,
this is required for XIVE which allocates one IRQ number for each IPI.

Signed-off-by: Cédric Le Goater <address@hidden>
---
 hw/ppc/spapr.c         | 63 ++++++++++++++++++++++++++++++++++++++++++++++++--
 include/hw/ppc/spapr.h |  2 ++
 2 files changed, 63 insertions(+), 2 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 5d69df928434..b6577dbecdea 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -44,6 +44,7 @@
 #include "mmu-hash64.h"
 #include "mmu-book3s-v3.h"
 #include "qom/cpu.h"
+#include "target/ppc/cpu-models.h"
 
 #include "hw/boards.h"
 #include "hw/ppc/ppc.h"
@@ -54,6 +55,7 @@
 #include "hw/ppc/spapr_vio.h"
 #include "hw/pci-host/spapr.h"
 #include "hw/ppc/xics.h"
+#include "hw/ppc/spapr_xive.h"
 #include "hw/pci/msi.h"
 
 #include "hw/pci/pci.h"
@@ -202,6 +204,35 @@ static void xics_system_init(MachineState *machine, int 
nr_irqs, Error **errp)
     }
 }
 
+static sPAPRXive *spapr_spapr_xive_create(sPAPRMachineState *spapr, int 
nr_irqs,
+                               int nr_servers, Error **errp)
+{
+    Error *local_err = NULL;
+    Object *obj;
+
+    obj = object_new(TYPE_SPAPR_XIVE);
+    object_property_add_child(OBJECT(spapr), "xive", obj, &error_abort);
+    object_property_add_const_link(obj, "ics", OBJECT(spapr->ics),
+                                   &error_abort);
+    object_property_set_int(obj, nr_irqs, "nr-irqs",  &local_err);
+    if (local_err) {
+        goto error;
+    }
+    object_property_set_int(obj, nr_servers, "nr-targets", &local_err);
+    if (local_err) {
+        goto error;
+    }
+    object_property_set_bool(obj, true, "realized", &local_err);
+    if (local_err) {
+        goto error;
+    }
+
+    return SPAPR_XIVE(obj);
+error:
+    error_propagate(errp, local_err);
+    return NULL;
+}
+
 static int spapr_fixup_cpu_smt_dt(void *fdt, int offset, PowerPCCPU *cpu,
                                   int smt_threads)
 {
@@ -1093,7 +1124,8 @@ static void *spapr_build_fdt(sPAPRMachineState *spapr,
     }
 
     QLIST_FOREACH(phb, &spapr->phbs, list) {
-        ret = spapr_populate_pci_dt(phb, PHANDLE_XICP, fdt, XICS_IRQS_SPAPR);
+        ret = spapr_populate_pci_dt(phb, PHANDLE_XICP, fdt,
+                                    XICS_IRQS_SPAPR + 
xics_max_server_number());
         if (ret < 0) {
             error_report("couldn't setup PCI devices in fdt");
             exit(1);
@@ -2140,6 +2172,16 @@ static void spapr_init_cpus(sPAPRMachineState *spapr)
     g_free(type);
 }
 
+/*
+ * Only POWER9 Processor chips support the XIVE interrupt controller
+ */
+static bool ppc_support_xive(MachineState *machine)
+{
+   PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(first_cpu);
+
+   return pcc->pvr_match(pcc, CPU_POWERPC_POWER9_BASE);
+}
+
 /* pSeries LPAR / sPAPR hardware init */
 static void ppc_spapr_init(MachineState *machine)
 {
@@ -2237,7 +2279,8 @@ static void ppc_spapr_init(MachineState *machine)
     load_limit = MIN(spapr->rma_size, RTAS_MAX_ADDR) - FW_OVERHEAD;
 
     /* Set up Interrupt Controller before we create the VCPUs */
-    xics_system_init(machine, XICS_IRQS_SPAPR, &error_fatal);
+    xics_system_init(machine, XICS_IRQS_SPAPR + xics_max_server_number(),
+                     &error_fatal);
 
     /* Set up containers for ibm,client-set-architecture negotiated options */
     spapr->ov5 = spapr_ovec_new();
@@ -2274,6 +2317,22 @@ static void ppc_spapr_init(MachineState *machine)
 
     spapr_init_cpus(spapr);
 
+    /* Set up XIVE. CAS will choose whether the guest runs in XICS
+     * (legacy mode) or XIVE Exploitation mode
+     *
+     * We don't have KVM support yet, so check for irqchip=on
+     */
+    if (ppc_support_xive(machine)) {
+        if (kvm_enabled() && machine_kernel_irqchip_required(machine)) {
+            error_report("kernel_irqchip requested. no XIVE support");
+        } else {
+            spapr->xive = spapr_spapr_xive_create(spapr,
+                               XICS_IRQS_SPAPR + xics_max_server_number(),
+                               xics_max_server_number(),
+                               &error_fatal);
+        }
+    }
+
     if (kvm_enabled()) {
         /* Enable H_LOGICAL_CI_* so SLOF can talk to in-kernel devices */
         kvmppc_enable_logical_ci_hcalls();
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 2a303a705c17..6cd5ab73c5dc 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -14,6 +14,7 @@ struct sPAPRNVRAM;
 typedef struct sPAPREventLogEntry sPAPREventLogEntry;
 typedef struct sPAPREventSource sPAPREventSource;
 typedef struct sPAPRPendingHPT sPAPRPendingHPT;
+typedef struct sPAPRXive sPAPRXive;
 
 #define HPTE64_V_HPTE_DIRTY     0x0000000000000040ULL
 #define SPAPR_ENTRY_POINT       0x100
@@ -127,6 +128,7 @@ struct sPAPRMachineState {
     MemoryHotplugState hotplug_memory;
 
     const char *icp_type;
+    sPAPRXive  *xive;
 };
 
 #define H_SUCCESS         0
-- 
2.13.5