On 04/05/12 20:12, Alexander Graf wrote:
On 04.05.2012, at 16:02, Christian Borntraeger wrote:
On 04/05/12 16:00, 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.
Or in other words, this code is closer to the real s390 boxes.
Yeah, I see the point. I'd really like to get Anthony's comments on this one
first though.
Right.
Anthony, this is the prototype of the IPL device that we have talked about some
weeks
ago. Is an external device to do the IPL process for s390 still ok with you?