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

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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