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Re: [Xen-devel] [PATCH 04/19] xen: arm: provide and use a handle_raz_wi helper



Hi Ian,

On 31/03/2015 11:07, Ian Campbell wrote:
Reduces the use of goto in the trap handlers to none.

Some explcitily 32-bit types become register_t here, but that's OK, on

s/explcitily/explicitly/

32-bit they are 32-bit already and on 64-bit it is fine/harmless to
set the larger register, a 32-bit guest won't see the top half in any
case.

What about 32-bit userspace on 64-bit kernel? Are we sure that a guest kernel won't only save the bottom half of the register?

Regards,

--
Julien Grall

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