[Xen-devel] new hypercall implementation question

[Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>]

Is it safe to pass three guest virtual addresses via a hypercall
to Xen and expect Xen to safely copy data (two scalars and one
array of pagesize-bytes... not necessarily aligned on a page
boundary) back to the guest, or do I need to do something fancy
to avoid weird corner cases, e.g. to ensure restartabililty
in case of guest page fault?

This is a privileged-only hypercall used only as part of
save/restore/live-migrate (for tmem) if that is relevant.

Thanks,
Dan

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