RE: [Xen-devel] HVM context

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

> > 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

Or you can use (or steal code from) the very nice tool
that Tim Deegan wrote, xen-hvmctx, which is included
in the xen-unstable source at tools/misc/xen-hvmctx.c.

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