>>
>> If you make this
>>
>> + union {
>> + struct kvm_vmx_data vmx[1];
>> + struct kvm_svm_data svm[1];
>> + };
>>
>> then we can later change it to a zero-sized array with variable-size
>> allocation, with no additional code changes.
>>
>
> Why do we want to make it array? I suppose that we only have 1 struct
> (either vmx or svm) for each vcpu, no?
>
If it's an array of size one, you can refer to the only element with
vcpu->vmx->member. If it's later changed to an array of size zero, you
can keep the references the same, and change the allocations to
kmalloc(sizeof(struct kvm_vcpu) +sizeof(struct kvm_vmx_data)) so that
you don't allocate any unnecessary memory.
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