On Mon, Mar 31, 2008 at 10:40:41PM +0800, fang zheng wrote:
> Does system call must run previllaged mode?
> If this is true, UML kernel run on the host user space,
> how does it(UML kernel) deal with system calls from UML processes?
There's nothing magic about system calls. They can be run in
host userspace - there just needs to be a distinction between
userspace and kernelspace within UML. And that distinction is whether
or not your system calls are allowed to run on the host or not.
> Does guest OS have the same system calls with host OS?
Not necessarily.
> So system calls of UML processes are annulled and it run the system call
> functions on the host?
Of course not. What would be the point of nullifying them in that
case?
Jeff
--
Work email - jdike at linux dot intel dot com
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