Re: [Xen-devel] Save paused cpu ctx

[Isaila Alexandru <aisaila@xxxxxxxxxxxxxxx>]

On Wed, 2018-09-19 at 10:41 +0200, Roger Pau Monné wrote:
> On Wed, Sep 19, 2018 at 11:21:32AM +0300, Isaila Alexandru wrote:
> > Hello, 
> > 
> > I want to restart the discussion on dropping the "if ( v-
> > >pause_flags &
> > VPF_down )" from hvm_save_cpu_ctxt() and be able to save context in
> > a
> > vcup down state. The content of the ctx could be filled like it is
> > described in Intel SDM, "9.1.1 Processor State After Reset" (https:
> > //so
> > ftware.intel.com/sites/default/files/managed/39/c5/325462-sdm-vol-
> > 1-
> > 2abcd-3abcd.pdf   page 2996).
> 
> If the point is filling the context with the default reset state why
> can't this be done by the tools if required?
> 
> It seems like saving the state of down vCPUs is quite pointless since
> the state is always going to be the same, and will just increase the
> size of the migration stream, but maybe I'm missing something.
> 
The idea behind this is to be able to query a vcpu and have it's state
because right now xen does not return any info about a vcpu if it's
down. 

We do not want to save the context but just to get info about it as a
result of a query.

Alex

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