[CRIU] [PATCH 11/19] dump: Checkpoint the FPU state

[Cyrill Gorcunov]

The main work is done by parasite_dump_fpu helper.
We prepare the FPU frame in caller code then pass
execution to the parasite which simply yields
fxsave/xsave instrution depending on which features
are supported.

Also our PB allocation for FPU frame has been done
in optimistic model -- ie we do allocate complete
"xsave" frame which incudes the space for YMM registers.
Thus at moment of dumping if we find that no xsave
feature is supported we simply free memory here.

It makes sense since it allows us to have less code
and after all the modern cpus are starting to have
xsave instruction as a common.

Signed-off-by: Cyrill Gorcunov <gorcunov at openvz.org>
---
 cr-dump.c |   58 ++++++++++++++++++++++++++++++++++------------------------
 1 files changed, 34 insertions(+), 24 deletions(-)

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