On Mon, 25 Jun 2018 10:29:46 +0200
Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
> On 06/25/2018 10:05 AM, Cornelia Huck wrote:
> > On Mon, 25 Jun 2018 09:27:59 +0200
> > Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
> >> Something like this in QEMU
> >>
> >> diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
> >> index f278036fa7..14153ce880 100644
> >> --- a/hw/s390x/ipl.c
> >> +++ b/hw/s390x/ipl.c
> >> @@ -187,11 +187,13 @@ static void s390_ipl_realize(DeviceState *dev, Error **errp)
> >> */
> >> if (pentry == KERN_IMAGE_START || pentry == 0x800) {
> >> ipl->start_addr = KERN_IMAGE_START;
> >> - /* Overwrite parameters in the kernel image, which are "rom" */
> >> - strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
> >> } else {
> >> ipl->start_addr = pentry;
> >> }
> >> + if (ipl->cmdline) {
> >> + /* If there is a command line, put it in the right place */
> >> + strcpy(rom_ptr(KERN_PARM_AREA), ipl->cmdline);
> >> + }
> >
> > Check for the magic Linux string (like in the non-elf case) first?
>
> Even that does not exists in vmlinux but only in bzImage with the latest patchset
> (in next, but not upstream yet)
Ok.
> >
> >>
> >> if (ipl->initrd) {
> >> ram_addr_t initrd_offset;
> >>
> >> would put the command line in no matter what the start address is.
> >
> > I'm for putting that one in (and backporting it to qemu-stable). It's a
> > bit worrying, though, that our ipl code is so fragile...
>
> We actually have to combine this with Thomas fix (to check for rom_ptr returning
> something sane). It seems that ipl->commandline is always there, so we have to
> check for strlen!=0 it seems..
>
> I mean if somebody ask for "-append something" we can certainly always write something
> if there is rom/ram.
Given that the uncompressed image is not supposed to be bootable
anymore, does it make sense to add this anyway?
I'll go ahead and queue Thomas' fix, though.
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