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kvm: Remove x2apic feature from CPU model when kernel_irqchip is off

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x2apic feature is in the kvm_default_props and automatically added to all
CPU models when KVM is enabled. But userspace devices don't support x2apic
which can't be enabled without the in-kernel irqchip. It will trigger
warning of "host doesn't support requested feature: CPUID.01H:ECX.x2apic
[bit 21]" when kernel_irqchip is off. This patch is to fix it via removing
x2apic feature when kernel_irqchip is off.

Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Lan Tianyu 2016-02-25 23:15:12 +08:00 committed by Eduardo Habkost
parent 4467c6c118
commit 492a4c94be
1 changed files with 4 additions and 0 deletions
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4
target-i386/cpu.c
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@ -2132,6 +2132,10 @@ static void x86_cpu_load_def(X86CPU *cpu, X86CPUDefinition *def, Error **errp)
/* Special cases not set in the X86CPUDefinition structs: */
if (kvm_enabled()) {
if (!kvm_irqchip_in_kernel()) {
x86_cpu_change_kvm_default("x2apic", "off");
}
x86_cpu_apply_props(cpu, kvm_default_props);
}