[Qemu-devel] [PATCH 2/7 v8] target-i386: Attach ICC bus to CPU on its creation

[Igor Mammedov <imammedo@redhat.com>]

X86CPU should have parent bus so it could provide bus for child APIC.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
---
TODO: fix unplug of bus-less devices in device-del

v3:
  - check icc_bridge for NULL and report error nicely instead of SIGSEGV
v2:
  - pass icc_bridge to cpu_x86_create instead of resolving it each time
---
 hw/i386/pc.c         | 10 ++++++----
 hw/i386/pc_piix.c    |  2 +-
 hw/i386/pc_q35.c     |  2 +-
 include/hw/i386/pc.h |  2 +-
 target-i386/cpu.c    | 15 +++++++++++++--
 target-i386/cpu.h    |  3 ++-
 6 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 7c7dd86..658ff6c 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -890,12 +890,13 @@ void pc_acpi_smi_interrupt(void *opaque, int irq, int level)
     }
 }
 
-static X86CPU *pc_new_cpu(const char *cpu_model, int64_t apic_id, Error **errp)
+static X86CPU *pc_new_cpu(const char *cpu_model, int64_t apic_id,
+                          DeviceState *icc_bridge, Error **errp)
 {
     X86CPU *cpu;
     Error *local_err = NULL;
 
-    cpu = cpu_x86_create(cpu_model, errp);
+    cpu = cpu_x86_create(cpu_model, icc_bridge, errp);
     if (!cpu) {
         return cpu;
     }
@@ -913,7 +914,7 @@ static X86CPU *pc_new_cpu(const char *cpu_model, int64_t apic_id, Error **errp)
     return cpu;
 }
 
-void pc_cpus_init(const char *cpu_model)
+void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge)
 {
     int i;
     Error *error = NULL;
@@ -928,7 +929,8 @@ void pc_cpus_init(const char *cpu_model)
     }
 
     for (i = 0; i < smp_cpus; i++) {
-        pc_new_cpu(cpu_model, x86_cpu_apic_id_from_index(i), &error);
+        pc_new_cpu(cpu_model, x86_cpu_apic_id_from_index(i),
+                   icc_bridge, &error);
         if (error) {
             fprintf(stderr, "%s\n", error_get_pretty(error));
             error_free(error);
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 51b738a..2190f0a 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -93,7 +93,7 @@ static void pc_init1(MemoryRegion *system_memory,
     object_property_add_child(qdev_get_machine(), "icc-bridge",
                               OBJECT(icc_bridge), NULL);
 
-    pc_cpus_init(cpu_model);
+    pc_cpus_init(cpu_model, icc_bridge);
     pc_acpi_init("acpi-dsdt.aml");
 
     if (kvmclock_enabled) {
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 317dd0c..a926e38 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -80,7 +80,7 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
     object_property_add_child(qdev_get_machine(), "icc-bridge",
                               OBJECT(icc_bridge), NULL);
 
-    pc_cpus_init(cpu_model);
+    pc_cpus_init(cpu_model, icc_bridge);
     pc_acpi_init("q35-acpi-dsdt.aml");
 
     kvmclock_create();
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 14b504c..8a6e76c 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -78,7 +78,7 @@ extern int fd_bootchk;
 void pc_register_ferr_irq(qemu_irq irq);
 void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
 
-void pc_cpus_init(const char *cpu_model);
+void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge);
 void pc_acpi_init(const char *default_dsdt);
 void *pc_memory_init(MemoryRegion *system_memory,
                     const char *kernel_filename,
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 0d9493d..4fe4325 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -41,6 +41,7 @@
 #endif
 
 #include "sysemu/sysemu.h"
+#include "hw/cpu/icc_bus.h"
 #ifndef CONFIG_USER_ONLY
 #include "hw/xen/xen.h"
 #include "hw/sysbus.h"
@@ -1618,7 +1619,8 @@ static void cpu_x86_register(X86CPU *cpu, const char *name, Error **errp)
     object_property_set_str(OBJECT(cpu), def->model_id, "model-id", errp);
 }
 
-X86CPU *cpu_x86_create(const char *cpu_model, Error **errp)
+X86CPU *cpu_x86_create(const char *cpu_model, DeviceState *icc_bridge,
+                       Error **errp)
 {
     X86CPU *cpu = NULL;
     CPUX86State *env;
@@ -1635,6 +1637,14 @@ X86CPU *cpu_x86_create(const char *cpu_model, Error **errp)
     features = model_pieces[1];
 
     cpu = X86_CPU(object_new(TYPE_X86_CPU));
+#ifndef CONFIG_USER_ONLY
+    if (icc_bridge == NULL) {
+        error_setg(&error, "Invalid icc-bridge value");
+        goto out;
+    }
+    qdev_set_parent_bus(DEVICE(cpu), qdev_get_child_bus(icc_bridge, "icc"));
+    object_unref(OBJECT(cpu));
+#endif
     env = &cpu->env;
     env->cpu_model_str = cpu_model;
 
@@ -1659,7 +1669,7 @@ X86CPU *cpu_x86_init(const char *cpu_model)
     Error *error = NULL;
     X86CPU *cpu;
 
-    cpu = cpu_x86_create(cpu_model, &error);
+    cpu = cpu_x86_create(cpu_model, NULL, &error);
     if (error) {
         goto out;
     }
@@ -2346,6 +2356,7 @@ static void x86_cpu_common_class_init(ObjectClass *oc, void *data)
 
     xcc->parent_realize = dc->realize;
     dc->realize = x86_cpu_realizefn;
+    dc->bus_type = TYPE_ICC_BUS;
 
     xcc->parent_reset = cc->reset;
     cc->reset = x86_cpu_reset;
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index ab151d5..f193752 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -897,7 +897,8 @@ typedef struct CPUX86State {
 #include "cpu-qom.h"
 
 X86CPU *cpu_x86_init(const char *cpu_model);
-X86CPU *cpu_x86_create(const char *cpu_model, Error **errp);
+X86CPU *cpu_x86_create(const char *cpu_model, DeviceState *icc_bridge,
+                       Error **errp);
 int cpu_x86_exec(CPUX86State *s);
 void x86_cpu_list(FILE *f, fprintf_function cpu_fprintf);
 void x86_cpudef_setup(void);
-- 
1.8.2.1