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pc-bios/s390-ccw: do a subsystem reset before running the guest
The loader BIOS has already activated several devices. Let's do a subsystem reset before jumping into the guest. As there is no direct way of doing so, we use diagnose 308 to bring the system in a defined state. This is similar to what kdump on s390 uses. We have to define a small trampoline function that restores the low bytes to whatever the bootmap has written there. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: Alexander Graf <agraf@suse.de> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
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