On 04/05/12 15:53, Alexander Graf wrote: > > On 04.05.2012, at 15:44, Christian Borntraeger wrote: > >> An IPL (booting) on s390 of SCSI disks is done by a firmware component. >> Lets implement this scheme as an qemu device that also allows to >> configure the IPL like the HMC. We have a parameter iplid that >> refers to a disk device and a load parm that specifies the entry >> on the disk to be ipled. We also provide a default device >> if no -device s390-ipl statement is given. > > Any reason we can't do this in guest firmware code?
Conceptually guest firmware does not exist in the guest address space on s390. It is separate in a storage area called HSA. (you could say the existing hardware is semi-hosted, you cant buy it bare metal. Doing the boot code in guest address space will fail if the guest firmware address collides with the addresses specified by a bootmap. Christian
