[uml-devel] Regarding Kernel mode in UML process.

[uml-devel] Regarding Kernel mode in UML process.

[Krishnappa Abhijith-A21204]

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Hi,
        Regarding Kernel mode in UML process. This question is on UML TT
mode
A UML process wil be in Kernel mode only for executing the getpid(), and
also some signals is a UML specified stack.
Is there any other way that UML process executes in kernel mode. ?
Also when UML process enters the KERNEL by the means described above the
tracing is turned off, this is done for performance issues only right ?
 
 
Thanks,
Abhi

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Re: [uml-devel] Regarding Kernel mode in UML process.

[Jeff Dike]

On Mon, Mar 19, 2007 at 11:16:38AM +0800, Krishnappa Abhijith-A21204 wrote:
>         Regarding Kernel mode in UML process. This question is on UML TT
> mode
> A UML process wil be in Kernel mode only for executing the getpid(), and
> also some signals is a UML specified stack.

And whenever the UML kernel executes a system call, of which there are
many.

> Also when UML process enters the KERNEL by the means described above the
> tracing is turned off, this is done for performance issues only
> right ?

No, it's done for security.  A UML process must not be allowed to
execute system calls on the host.  Only the UML kernel may do that.

				Jeff

-- 
Work email - jdike at linux dot intel dot com

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