Re: [Xen-devel] [PATCH] libxc: Add xc_domain_hvm_get_mtrr_type() call

[Razvan Cojocaru <rzvncj@xxxxxxxxx>]

> Sorry, no.  The 'overlapped' bit is a piece of xen implementation, and
> not an architectural state of the VM, so it doesn't belong in the save
> record.  It's trivial to recalculate in a user-space tool, and the

Is it trivial to recalculate that in a userspace tool? I thought the
only way to properly calculate that in the first place was to use
cpuid_eax() in the calculation, which is only available at hypervisor
level (hence much of this thread). Am I missing something?

> result can be cached (since you can also get a mem-event on MSR writes,
> you don't have to pull all this MTRR state out of the giuest except when
> the MTRRs have been changed).

Unfortunately, due to the design of components I don't control, my
application does not have the luxury of waiting for an MSR write event.
(Has my MSR mem_event patch been acknowledged? Or was this already work
in progress? I had to patch my Xen source code to be able to get MSR
events...)

> I'll take a proper look at this thread tomorrow and see if I can suggest
> anything more helpful. 

Thank you, I appreciate the reply, and your time.

All the best,
Razvan Cojocaru

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