Hi Andrew,

On 05/12/2019 22:30, Andrew Cooper wrote:
The use of return_reg() assumes ARM's 32bit ABI.  Therefore, a failure such as
-EINVAL will appear as a large positive number near 4 billion to a 64bit ARM
guest which happens to use continue_hypercall_on_cpu().

Introduce a new arch_hypercall_tasklet_result() hook which is implemented by
both architectures, and drop the return_reg() macros.  This logic will be
extended in a later change to make continuations out of the tasklet work.

Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
Acked-by: Jan Beulich <jbeul...@suse.com>

Reviewed-by: Julien Grall <jul...@xen.org>

Cheers,

--
Julien Grall

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