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The current code that switches into HYP mode doesn't bother to set up a stack for HYP mode. This doesn't work for EFI applications as they expect a usable stack. Fix this by migrating the stack pointer from SP_svc to SP_hyp while in Monitor mode. This restores the stack pointer when we drop into HYP mode. Signed-off-by: Mark Kettenis <kettenis@openbsd.org> Signed-off-by: Alexander Graf <agraf@suse.de>