On 24.11.2009, at 20:26, Anthony Liguori wrote: > Alexander Graf wrote: >> On 24.11.2009, at 19:53, Anthony Liguori wrote: >> >> >>> Alexander Graf wrote: >>> >>>> The default bootloader on S390 is zipl. Because we don't emulate normal >>>> S390 >>>> hardware we need to write our own parser for the bootloader configuration, >>>> so we can boot off real hard disks. >>>> >>>> This patch adds a pretty simple implementation of such an interpreter. It >>>> only >>>> supports 512 bytes sector sizes, always boots the default entry and doesn't >>>> work with reboots yet. But it's better than nothing. >>>> >>> This is a bit unfortunate. Wouldn't it be better to write a custom version >>> of zipl that ran in the guest? >>> >> >> Yeah, I've been struggling quite a bit with this myself. Writing a custom >> version that runs in the guest means we have to create >> >> 1) extboot >> 2) input backdoor >> >> Or implement virtio in that custom version. That sounds like a pretty huge >> project. >> >> So I decided to go for the easy way for now and hopefully migrate to an >> in-guest version later. >> > > Can't you just use kboot? > > Use a kernel loader to load the kboot module/initrd, include kboot as our > firmware, then let kboot do the magic to launch the real linux kernel from > disk.
Hm, so we'd have to rely on kexec working properly? I've seen how badly that turned out on the PS3. I guess I'd rather write a virtio implementation :-). Alex
