Comment 3 for bug 1191326

problem appeared in this commit:

commit b90600eed3c0efe5f3260853c873caf51c0677b1
Author: Avi Kivity <email address hidden>
Date: Wed Oct 3 16:42:37 2012 +0200

    dma: make dma access its own address space

    Instead of accessing the cpu address space, use an address space
    configured by the caller.

    Eventually all dma functionality will be folded into AddressSpace,
    but we have to start from something.

    Reviewed-by: Anthony Liguori <email address hidden>
    Signed-off-by: Avi Kivity <email address hidden>