Re: [Xen-devel] [PATCH 3/6] x86/domctl: Simplfy XEN_DOMCTL_getvcpuextstate when xsave is not in use

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 12.09.16 at 11:51, <andrew.cooper3@xxxxxxxxxx> wrote:
> Older guests will not use xsave even if it is available.  As such, their
> xcr0_accum will be 0 at the point of migrate.
> 
> If it is empty, forgo the memory allocation and serialisation into a
> zero-length buffer.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>


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