q35: set split kernel irqchip as default

Starting from QEMU 4.0, let's specify "split" as the default value for
kernel-irqchip.

So for QEMU>=4.0 we'll have: allowed=Y,required=N,split=Y
   for QEMU<=3.1 we'll have: allowed=Y,required=N,split=N
   (omitting all the "kernel_irqchip_" prefix)

Note that this will let the default q35 machine type to depend on
Linux version 4.4 or newer because that's where split irqchip is
introduced in kernel.  But it's fine since we're boosting supported
Linux version for QEMU 4.0 to around Linux 4.5.  For more information
please refer to the discussion on AMD's RDTSCP:

  https://lore.kernel.org/lkml/20181210181328.GA762@zn.tnic/

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/core/machine.c b/hw/core/machine.c
index c51423b..4439ea6 100644 (file)
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -653,8 +653,10 @@ static void machine_class_base_init(ObjectClass *oc, void *data)
 static void machine_initfn(Object *obj)
 {
     MachineState *ms = MACHINE(obj);
+    MachineClass *mc = MACHINE_GET_CLASS(obj);
 
     ms->kernel_irqchip_allowed = true;
+    ms->kernel_irqchip_split = mc->default_kernel_irqchip_split;
     ms->kvm_shadow_mem = -1;
     ms->dump_guest_core = true;
     ms->mem_merge = true;

diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 8836d21..0a3f3f1 100644 (file)
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -304,6 +304,7 @@ static void pc_q35_machine_options(MachineClass *m)
     m->units_per_default_bus = 1;
     m->default_machine_opts = "firmware=bios-256k.bin";
     m->default_display = "std";
+    m->default_kernel_irqchip_split = true;
     m->no_floppy = 1;
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_AMD_IOMMU_DEVICE);
     machine_class_allow_dynamic_sysbus_dev(m, TYPE_INTEL_IOMMU_DEVICE);
@@ -323,6 +324,7 @@ DEFINE_Q35_MACHINE(v4_0, "pc-q35-4.0", NULL,
 static void pc_q35_3_1_machine_options(MachineClass *m)
 {
     pc_q35_4_0_machine_options(m);
+    m->default_kernel_irqchip_split = false;
     m->alias = NULL;
     SET_MACHINE_COMPAT(m, PC_COMPAT_3_1);
 }

diff --git a/include/hw/boards.h b/include/hw/boards.h
index f82f284..3623848 100644 (file)
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -195,6 +195,7 @@ struct MachineClass {
     const char *hw_version;
     ram_addr_t default_ram_size;
     const char *default_cpu_type;
+    bool default_kernel_irqchip_split;
     bool option_rom_has_mr;
     bool rom_file_has_mr;
     int minimum_page_bits;