[Qemu-devel] [PATCH v6 4/6] Introduce irqchip type specification for KVM

[Pavel Fedin]

This patch introduces kernel_irqchip_type member in Machine class, which
it passed to kvm_arch_irqchip_create. It allows machine models to specify
correct GIC type during KVM capability verification. The variable is
defined as int in order to be architecture-agnostic for potential future
uses by other architectures.

Signed-off-by: Pavel Fedin <address@hidden>
---
 hw/arm/vexpress.c    |  1 +
 hw/arm/virt.c        |  3 +++
 include/hw/boards.h  |  1 +
 include/sysemu/kvm.h |  3 ++-
 kvm-all.c            |  2 +-
 stubs/kvm.c          |  2 +-
 target-arm/kvm.c     | 13 +++++++++++--
 7 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/hw/arm/vexpress.c b/hw/arm/vexpress.c
index da21788..0675a00 100644
--- a/hw/arm/vexpress.c
+++ b/hw/arm/vexpress.c
@@ -556,6 +556,7 @@ static void vexpress_common_init(MachineState *machine)
     const hwaddr *map = daughterboard->motherboard_map;
     int i;
 
+    machine->kernel_irqchip_type = KVM_DEV_TYPE_ARM_VGIC_V2;
     daughterboard->init(vms, machine->ram_size, machine->cpu_model, pic);
 
     /*
diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 4846892..2e7d858 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -945,6 +945,9 @@ static void virt_instance_init(Object *obj)
                                     "Set on/off to enable/disable the ARM "
                                     "Security Extensions (TrustZone)",
                                     NULL);
+
+    /* Default GIC type is v2 */
+    vms->parent.kernel_irqchip_type = KVM_DEV_TYPE_ARM_VGIC_V2;
 }
 
 static void virt_class_init(ObjectClass *oc, void *data)
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 2aec9cb..37eb767 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -127,6 +127,7 @@ struct MachineState {
     char *accel;
     bool kernel_irqchip_allowed;
     bool kernel_irqchip_required;
+    int kernel_irqchip_type;
     int kvm_shadow_mem;
     char *dtb;
     char *dumpdtb;
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index 983e99e..8f4d485 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -434,6 +434,7 @@ void kvm_init_irq_routing(KVMState *s);
 /**
  * kvm_arch_irqchip_create:
  * @KVMState: The KVMState pointer
+ * @type: irqchip type, architecture-specific
  *
  * Allow architectures to create an in-kernel irq chip themselves.
  *
@@ -441,7 +442,7 @@ void kvm_init_irq_routing(KVMState *s);
  *            0: irq chip was not created
  *          > 0: irq chip was created
  */
-int kvm_arch_irqchip_create(KVMState *s);
+int kvm_arch_irqchip_create(KVMState *s, int type);
 
 /**
  * kvm_set_one_reg - set a register value in KVM via KVM_SET_ONE_REG ioctl
diff --git a/kvm-all.c b/kvm-all.c
index 06e06f2..8df938d 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -1395,7 +1395,7 @@ static void kvm_irqchip_create(MachineState *machine, 
KVMState *s)
 
     /* First probe and see if there's a arch-specific hook to create the
      * in-kernel irqchip for us */
-    ret = kvm_arch_irqchip_create(s);
+    ret = kvm_arch_irqchip_create(s, machine->kernel_irqchip_type);
     if (ret == 0) {
         ret = kvm_vm_ioctl(s, KVM_CREATE_IRQCHIP);
     }
diff --git a/stubs/kvm.c b/stubs/kvm.c
index e7c60b6..a8505ff 100644
--- a/stubs/kvm.c
+++ b/stubs/kvm.c
@@ -1,7 +1,7 @@
 #include "qemu-common.h"
 #include "sysemu/kvm.h"
 
-int kvm_arch_irqchip_create(KVMState *s)
+int kvm_arch_irqchip_create(KVMState *s, int type)
 {
     return 0;
 }
diff --git a/target-arm/kvm.c b/target-arm/kvm.c
index b278542..180f75f 100644
--- a/target-arm/kvm.c
+++ b/target-arm/kvm.c
@@ -583,19 +583,28 @@ void kvm_arch_init_irq_routing(KVMState *s)
 {
 }
 
-int kvm_arch_irqchip_create(KVMState *s)
+int kvm_arch_irqchip_create(KVMState *s, int type)
 {
     int ret;
 
+    /* Failure here means forgotten initialization of
+     * machine->kernel_irqchip_type in model code
+     */
+    assert(type != 0);
+
     /* If we can create the VGIC using the newer device control API, we
      * let the device do this when it initializes itself, otherwise we
      * fall back to the old API */
 
-    ret = kvm_create_device(s, KVM_DEV_TYPE_ARM_VGIC_V2, true);
+    ret = kvm_create_device(s, type, true);
     if (ret == 0) {
         return 1;
     }
 
+    /* Fallback will create VGIC v2 */
+    if (type != KVM_DEV_TYPE_ARM_VGIC_V2) {
+        return ret;
+    }
     return 0;
 }
 
-- 
1.9.5.msysgit.0