Re: [Qemu-devel] [PATCH 1/9] Add stub functions for PCI device models to do PCI DMA

[Michael S. Tsirkin]

On Sun, Oct 02, 2011 at 01:28:37PM +0200, Alexander Graf wrote:
> >> Good point.  Though this is really a virtio specific issue since
> >> other devices have explicit endianness (not guest dependent).
> > 
> > Hmm, not entirely virtio specific, some devices use stX macros to do the
> > conversion.  E.g. stw_be_phys and stl_le_phys are used in several
> > places.
> 
> Yes, explicit endianness. Virtio is the only device type we support in QEMU 
> that changes its endianness depending on the guest CPU. All other devices are 
> independent of the guest CPU we're targeting.
> 
> 
> Alex

True I think, for pci devices. And virtio bypasses the iommu
anyway, so we don't need to worry about it. But the point is that it
makes sense to support endian-ness handling in the core.

-- 
MST