>>> call + * when it encounters something that cannot be virtualized,
>>> such as + * accessing hardware devices via MMIO or regular IO. + */
>>> +struct kvm_callbacks {
>>> + /// For 8bit IO reads from the guest (Usually when executing
>>> 'inb') + int (*inb)(void *opaque, uint16_t addr, uint8_t *data);
>>> + /// For 16bit IO reads from the guest (Usually when executing
>>> 'inw') + int (*inw)(void *opaque, uint16_t addr, uint16_t *data);
>>
>> I don't know the privious story about this thread, but now I can't
>> understand the move. Why do we move all the structure to
>> arch-specific ? For IA64 side, almostly we can reuse them directly,
>> and just see some special fields as arch-specific. So, I think, we
>> should keep common fields in kvmctl.h.
>
> Are you suggesting that kvm_callbacks should be the union of all
> callbacks used on all architectures, and for any given architecture
> only a subset are actually used?
No, not a union. I think we should keep some common fields for all
archs. At least, io_callbacks should be same for all archs.
So, we need to split them into two parts, one common and the other one
is arch-specific. Maybe we should add an filed, such as arch to hold
arch-specific fields, instead of moving them all to kvmctl-x86.h
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