On 7/6/06, Gaurav Dhiman <gauravd.chd@xxxxxxxxx> wrote:
On 7/6/06, Tharindu Rukshan Bamunuarachchi <tharindub@xxxxxxxxx> wrote: > > AFAIK, This is only applies to virtualization context. I think Xen uses > this, if i am not wrong. > > I thought Gaurav was asking about "traditional" ring zero. I was not asking .... rather telling about tradition ring 0 ... :-) well what is this ring 0 for vm and how it is different from tradition ring 0. As the mode of processor is defined by 2 LSB bits of CS register, how is this ring 0 for VM represented there and what previlieges are restriced in this ?? regards, Gaurav
Gaurev, I was just looking at one of the tech. white papers and it appears there is no way for a guest os to know. Rather surprising to me. Quote: There is no software-visible bit whose setting indicates whether a logical processor is in VMX non-root operation. This fact may allow a VMM to prevent guest software from determining that it is running in a virtual machine Greg -- Greg Freemyer The Norcross Group Forensics for the 21st Century -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
