Re: [Qemu-devel] [PATCH 06/14] exec.c: Make address_space_rw take transaction attributes

[Paolo Bonzini]

On 09/04/2015 12:43, Peter Maydell wrote:
> > At this point, some memory barriers, basically.
>
> So what distinguishes a device that needs the memory barriers
> and does its accesses via dma_* from a device that doesn't and
> uses address_space_* or ld/st*_phys ? (Or for that matter a
> non-device that does memory accesses...)

I don't know exactly, I didn't follow the discussion very much back
then.  The memory barriers were fixing PPC bugs; PCI devices definitely
need them.

Paolo