RE: [Xen-users] Where do System calls go?

["Amit Dang" <amitd@xxxxxxxxxxxxx>]

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From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
helicoterus-elih@xxxxxxxx
Sent: Friday, May 01, 2009 5:24 PM
To: xen list
Subject: Re: [Xen-users] Where do System calls go?



Thanks, and what about hvm domU? How do the system calls work?


For HVM domU there is no change in the behavior of the system call.
HVM is only supported for Intel-VT and AMD-SVM processors. These
processors are virtualization aware.
Virtualization aware processors provide a new ring (Root-Ring 0) with
higher privilege for VMM and Guest OS continues to runs with the same
privilege (as without Xen) in Non-Root Ring 0.
Guest OS can issue the system calls the way it used to without Xen.

Hope this helps.

Dang




      

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