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q35: set split kernel irqchip as default

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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>
This commit is contained in:
Peter Xu 2018-12-20 13:40:35 +08:00 • committed by Michael S. Tsirkin
parent c2077e2ca0
commit b2fc91db84
3 changed files with 5 additions and 0 deletions
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2
hw/core/machine.c
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@ -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;