On 20/12/2019 13:49, Jan Beulich wrote:
> It is wrong for us to check frames beyond the guest specified limit
> (in the native case, other than in the compat one).
>
> Signed-off-by: Jan Beulich <jbeul...@suse.com>

Just like the restriction on sharing L2's, no guest is ever going to be
able to not zero all of this to operate on older hypervisors.

I agree that it is not ideal that this got into the ABI to begin with,
but as I said before, all you are doing is complicating
arch_set_info_guest() for a relaxation which no guest can use.

~Andrew

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