ARM: KVM: Check KVM_CAP_ARM_IRQ_LINE_LAYOUT_2 for smp_cpus > 256
Host kernel within [4.18, 5.3] report an erroneous KVM_MAX_VCPUS=512 for ARM. The actual capability to instantiate more than 256 vcpus was fixed in 5.4 with the upgrade of the KVM_IRQ_LINE ABI to support vcpu id encoded on 12 bits instead of 8 and a redistributor consuming a single KVM IO device instead of 2. So let's check this capability when attempting to use more than 256 vcpus within any ARM kvm accelerated machine. Signed-off-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Reviewed-by: Andrew Jones <drjones@redhat.com> Acked-by: Marc Zyngier <maz@kernel.org> Message-id: 20191003154640.22451-4-eric.auger@redhat.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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@ -182,6 +182,7 @@ int kvm_arm_get_max_vm_ipa_size(MachineState *ms)
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int kvm_arch_init(MachineState *ms, KVMState *s)
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{
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int ret = 0;
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/* For ARM interrupt delivery is always asynchronous,
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* whether we are using an in-kernel VGIC or not.
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*/
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@ -195,7 +196,14 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
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cap_has_mp_state = kvm_check_extension(s, KVM_CAP_MP_STATE);
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return 0;
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if (ms->smp.cpus > 256 &&
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!kvm_check_extension(s, KVM_CAP_ARM_IRQ_LINE_LAYOUT_2)) {
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error_report("Using more than 256 vcpus requires a host kernel "
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"with KVM_CAP_ARM_IRQ_LINE_LAYOUT_2");
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ret = -EINVAL;
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}
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return ret;
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}
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unsigned long kvm_arch_vcpu_id(CPUState *cpu)
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