Re: [Xen-devel] [PATCH] xen: fix initialization of wallclock time for PVHVM on migration

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 06/11/2013 12:59 PM, Jan Beulich wrote:
> > > > On 11.06.13 at 12:46, Roger Pau Monne <roger.pau@xxxxxxxxxx> wrote:
> > The initial values of the wallclock time in the shared info page are
> > set for PVHVM guests when the hypercall page is initialized, since the
> > hypercall page is not reinitialized on resume, the hypervisor
> > wallclock time is not properly set on resume.
> >
> > Fix it by forcing an update of the wallclock values when the shared
> > info page is mapped.
> NACK - this is a guest side bug. After migration, a guest _has_ to
> re-init the hypercall page, as it may have got migrated between
> a VMX and an SVM machine, and the hypercall instructions are
> different between them.
Does migrating from VMX to SVM actually work?

In any case, if Linux does it, then FreeBSD should do it too. (I assume 
this came up because you're working on the FreeBSD PVHVM port?)
 -George


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