Re: [Qemu-devel] [PATCH 05/17] pseries: savevm support for XICS interrupt controller

[Paolo Bonzini]

Il 09/07/2013 05:37, Alexey Kardashevskiy ha scritto:
> 
> btw xics-kvm does not introduce new members but does have very different
> .pre_save and .post_load. This actually was the whole point of splitting
> xics into xics and xics-kvm. I cannot see how I can fix it without hacks.
> Property's can be inherited from a parent class (?) but VMStateDescription
> cannot.

The vmstate's pre_save and post_load functions can dispatch to a method
in the subclass.  Again, i8259 does exactly what you want:

static void pic_dispatch_pre_save(void *opaque)
{
    PICCommonState *s = opaque;
    PICCommonClass *info = PIC_COMMON_GET_CLASS(s);

    if (info->pre_save) {
        info->pre_save(s);
    }
}

Paolo