Could a dirver allow Windows to make Linux system calls?

Could a dirver allow Windows to make Linux system calls?

[M.Thomas Frederiksen]

Given that the guest is a process on Linux, couldn't it use Linux system calls
like any other Linux process?  For example, could a driver be added to Windows,
so that Windows could use the same system call that X windows does to get access
to the video card?


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Re: Could a dirver allow Windows to make Linux system calls?

[Avi Kivity]

M.Thomas Frederiksen wrote:
> Given that the guest is a process on Linux, couldn't it use Linux system calls
> like any other Linux process?  

No, system calls on the guest go to the guest kernel.

> For example, could a driver be added to Windows,
> so that Windows could use the same system call that X windows does to get access
> to the video card?
>   

kvm exposes a hypercall mechanism which allows a guest driver to call 
the host.  You could use that to tunnel opengl commands to the display. 
See http://www.cs.toronto.edu/~andreslc/xen-gl/ for an example.

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


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