Re: [Xen-devel] Domain0/Domain 1 and ring1 (x86) - tracing question

[John Que <qwejohn@xxxxxxxxx>]

Hello , 
Does anybody knows the answer/any hint to my question  ? 
Any ideas ,  someone? 

Regards,
John

On 8/16/05, John Que <qwejohn@xxxxxxxxx> wrote:
> Hello,
> 
> Thanks !
> 
> This makes clear things a bit.
> 
> However, I had grepped under the linux-2.6-xen-sparse tree and
> saw only one occurrence of  BOOT_CS , in that
> linux-2.6-xen-sparse/include/asm-xen/asm-i386/segment.h.
> 
> I had also grepped under the "xen" (hypervisor) subtree and did not
> find and also under linux-2.6.12-xen0/arch/xen and did not find any
> occurrence of  BOOT_CS.
> 
> (There is of course in linux-2.6.12-xen0/arch/xen/i386/boot/setup.S ,
> but this seems unrelevant in our case).
> 
> I am probably missing something;
>  Any ideas ?
> 
> Regards,
> John
> 
> On 8/16/05, Petersson, Mats <mats.petersson@xxxxxxx> wrote:
> > There's a #define in arch-x86_32.h that defines FLAT_KERNEL_[CDS]S to
> > FLAT_RING1_[CDS]S. FLAT_RING1_[CDS]S is the entry in GDT for a CPL=1
> > (ring 1) code/data/stack[1] segment selector.
> > It is then used in various places to set up the registers used by the
> > actual kernel, for example the file
> > linux-2.6-xen-sparse/include/asm-xen/asm-i386/segment.h is using the
> > KERNEL_CS to give the BOOT_CS to the Linux kernel.
> >
> > [1] Stack segment is actually using the same selector as the data
> > segment.
> >
> > --
> > Mats
> >
> > > -----Original Message-----
> > > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> > > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of John Que
> > > Sent: 16 August 2005 11:59
> > > To: xen-devel@xxxxxxxxxxxxxxxxxxx
> > > Subject: [Xen-devel] Domain0/Domain 1 and ring1 (x86) -
> > > tracing question
> > >
> > > Hello,
> > > As I understand the Hypervisor should run in Ring 0 of the
> > > x86 , and the domains (Domain0 and DomainU) should work in Ring 1.
> > >
> > > I was a bit curious where in the code this assiging of Ring 0
> > > to Xen and Ring 1 to dom0/domU is done ?
> > > I had tried to look under arch/xen/i386 and didn't find.
> > >
> > > Is it in the assembler *.S files ?
> > >
> > > Regards,
> > > John
> > >
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-devel
> > >
> >
> >
>

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