xen/arm: disable interrupts on return_to_hypervisor
At the moment it is possible to reach return_to_hypervisor with
interrupts enabled (it happens all the times when we are actually going
back to hypervisor mode, when we don't take the return_to_guest path).
If that happens we risk loosing the content of ELR_hyp: if we receive an
interrupt right after restoring ELR_hyp, once we come back we'll have a
different value in ELR_hyp and the original is lost.
In order to make the return_to_hypervisor path safe, we disable
interrupts before restoring any registers.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
projects / xen.git / commit