Re: [Xen-devel] HVM context

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 09/10/2009 22:47, "Eads, Joshua Michael (S&T-Student)" <jmer43@xxxxxxx>
wrote:

> I have an HVM guest and I am trying to have a usermode program in Dom0 query
> the context (CPU registers, specifically) of the guest.
> 
> I first tried using xc_domain_getcontext() in xenctrl.h but I haven't figured
> out what data structure ctxt_buf is that it returns.  Next, I have tried using
> xc_vcpu_getcontext() in xenctrl.h but so far it always returns -1 for failure.
> For xc_vcpu_getcontext, I am passing in a vcpu number of 1 (I only have a
> single virtual CPU domU running) along with an unallocated
> vcpu_guest_context_t pointer.
> 
> Is this the right direction to pull guest registers, or is there another
> method I need to use to get the HVM guest context?

For an HVM guest you can use xc_domain_hvm_getcontext() or
xc_domain_hvm_getcontext_partial(). You then have to pick apart the bag of
bytes you get back. The save format is documented to some extent in
xen/include/public/arch-x86/hvm/save.h

 -- Keir



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