Re: [PATCH 0/3] virtio-mmio: handle BE guests on LE hosts

Paolo Bonzini
2013-10-14T14:57:14Z

Il 14/10/2013 16:52, Marc Zyngier ha scritto:
> > > Sure. And I imagine this traps back into the kernel to read some
> > > register and find out what the endianness of the accessing CPU is?
> >
> > Not yet. To be exact, it does the below today. But all virtio device
> > emulation is 100% guest endianness unaware. This helper is the only
> > piece of code where it gets any idea what endianness the guest has. So
> > by checking for references to it in the code you know where endianness
> > is an issue. And that's only in the config space.
>
> Only config space? How do you deal with virtio ring descriptors, for
> example?

They also use guest endianness, but do not use virtio_is_big_endian()
(yet?) so Alex missed them.

Paolo