Re: Userspace MSR handling

[Avi Kivity <avi@redhat.com>]

Gerd Hoffmann wrote:
>>
>> Or do the standard function pointer trick. Event channel notifications
>> change to eventfd_signal, grant table ops change to copy_to_user().
>
> grant table ops include mapping pages of the guest (aka domU) into the 
> host (aka dom0) address space, fill the pointer into some struct (bio 
> for blkback, skb for netback), send it down the road for processing. 
> netback and blkback do quite some lowlevel xen memory management to 
> get that done, including m2p and p2m table updates due to direct 
> paging mode.  It isn't as easy as s/hypercall/get_user_pages/ ...

So we need to plug it at a slightly higher level.  Conceptually can 
provide the same interfaces as xen, so it's just a matter of abstracting 
it nicely.

-- 
error compiling committee.c: too many arguments to function