Re: [Xen-devel] [PATCH v3 4/4] x86/PV: enable the emulated PIT

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 18.01.16 at 17:10, <andrew.cooper3@xxxxxxxxxx> wrote:
> On 18/01/16 11:06, Jan Beulich wrote:
>>> Whatever (eventually) gets used to set these values will however be
>>> present in the xl configuration, which is at the very start of the
>>> stream, and is what is used to create the new domain.
>> Which makes me repeat the question: Is this an inherent property
>> or just "that's the way it is right now"? And then of course the
>> question arises whether setting those flags at domain creation time
>> is the right model. I.e. ...
>>
>>> We really don't want the libxc migrate code to be making the
>>> DOMCTL_createdomain hypercall itself; it opens up a whole new attack
>>> surface via cunningly-crafted save image.  The best we can do is have a
>>> sanity check later on.
>> ... what about deriving the emulation flags from the various
>> pieces of state getting loaded, at least when there are matching
>> pairs (which namely is the case for PIT)?
> 
> How would you suggest setting theses flags up in the plain domain build
> case then?

Via a specific (new) hypercall, along the lines of what
XEN_DOMCTL_arm_configure_domain was?

Jan


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