Re: [Xen-devel] Question about "include/asm-x86/domain.h: struct arch_vcpu"

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 24 Feb 2006, at 16:31, Elizeu Santos-Neto wrote:

> 	I'm trying to carefully understand the process of creating a domain 
> and
> vcpu initialization. In particular, I'm currently interested in
> understanding exactly which information the "vcpu" structure holds.
>         
>         Which kind of flags does "arch_vcpu.flags" contain? I saw a comment /*
> TF_ */, but I did not quite get it.
>
>         What is it used for?
They're defined in asm/processor.h. There's only one right now -- 
TF_kernel mode, which indicates whether the guest is currently running 
in kernel mode or not. This is needed on x86/64 since guest 
applications and guets kernel both run in ring 3 and so there is no way 
to distinguish the two modes without maintaining a sfotware flag in 
Xen.
 -- Keir


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