Re: [Xen-devel] [PATCH 2/4] tools/libxc: Use an explicit check for PV MSRs in xc_domain_save()

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2014-06-05 at 16:57 +0100, Andrew Cooper wrote:
> To avoid a race condition with the vcpu touching a new MSR between the
> two hypercalls, Xen must return the maximum possible msr_count with the
> request for size, so the toolstack can guarantee to allocate a large
> enough buffer.

If the msr_count returned a build time constant can't it just be part of
the interface then? Either as #define or an explicitly sized array type
somewhere.

Ian.


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