Re: [Qemu-devel] [PATCH 4/5] milkymist-softusb: Don't map RAM memory regions in the device itself

[Paolo Bonzini]

Il 15/02/2013 17:17, Peter Maydell ha scritto:
> But these memory regions belong to this device -- we own them and
> they won't go away until the device is destroyed [which is never,
> as it happens, for this device.] More generally, if it's valid
> for us to hold a MemoryRegion* and call memory_region_get_ram_ptr()
> in the read/write function, it's just as valid to keep the ram pointer:
> the two have exactly matching lifetimes, unless I'm missing something.

No, you're not: "In practice it should be handled just fine by reference
counting, but I still find it harder to wrap my head around it".

> (as an aside, memory_region_destroy() doesn't free the memory that
> memory_region_init_ram() allocates.)

Paolo