Re: [Qemu-devel] [PATCH 25/61] pci: use uint64_t for bar addr and size instead of uint32_t.

[Isaku Yamahata]

On Wed, Sep 30, 2009 at 06:55:51PM +0400, malc wrote:
> On Wed, 30 Sep 2009, Isaku Yamahata wrote:
> 
> > This patch is preliminary for 64bit bar.
> > For 64bit bar support, replace uint32_t with uint64_t for addr/size
> > to be able to represent 64bit.
> 
> I'm not sure how this supposed to work with devices that are physically
> incapable of working with 64bit addresses, care to explain?

Such a device implements only 32bit BAR and never 64bit BAR.
So it gets only 32bit addressable value in uint64_t.
If you want to make sure it, you can insert
assert(address <= UINT32_MAX) into map function of such devices.
-- 
yamahata