s390x/misc_helper.c: wrap s390_virtio_hypercall in BQL
s390_virtio_hypercall can trigger IO events and interrupts, most notably when using virtio-ccw devices. Reviewed-by: NAlexander Graf <agraf@suse.de> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net> Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org> Fixes: 278f5e98 ("s390x/misc_helper.c: wrap IO instructions in BQL") Signed-off-by: NAlexander Graf <agraf@suse.de>
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