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

[John Que <qwejohn@xxxxxxxxx>]

Hello, 

 Thanks; 
This uses  FLAT_KERNEL_CS (and not BOOT_CS). 
(It could be that BOOT_CS is not needed at all. As I said, I had grepped
for BOOT_CS and not for other defintions like FLAT_KERNEL_CS).

However,this satisfies me and it gives answer to my question.

Regarding build - I have no problem with build. It went OK.

Regads,
John


On 8/18/05, Petersson, Mats <mats.petersson@xxxxxxx> wrote:
> How about:
> 
> Arch/x86/domain.c: new_thread().
> 
> That function is called from arch/x86/domain_build.c when building dom0,
> 
> 
> I can't help you with tracing the domU build at the moment (I've got a
> job to do... ;-). Myabe someone else can pipe in with some more info.
> 
> --
> Mats
> 
> > -----Original Message-----
> > From: John Que [mailto:qwejohn@xxxxxxxxx]
> > Sent: 18 August 2005 11:28
> > To: Petersson, Mats
> > Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [Xen-devel] Domain0/Domain 1 and ring1 (x86) -
> > tracing question
> >
> > 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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