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spapr: Do not put empty properties for -kernel/-initrd/-append 

We are going to use spapr_build_fdt() for the boot time FDT and as an
update for SLOF during handling of H_CAS. SLOF will apply all properties
from the QEMU's FDT which is usually ok unless there are properties
changed by grub or guest kernel. The properties are:
bootargs, linux,initrd-start, linux,initrd-end, linux,stdout-path,
linux,rtas-base, linux,rtas-entry. Resetting those during CAS will most
likely cause grub failure.

Don't create such properties if we're booting without "-kernel" and
"-initrd" so they won't get included into the DT update blob and
therefore the guest is more likely to boot successfully.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
[dwg: Tweaked commit message based on Greg Kurz's input]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Alexey Kardashevskiy 2019-09-03 12:35:33 +10:00 committed by David Gibson
parent 3a17e38f6e
commit 5ced78955f
1 changed files with 10 additions and 5 deletions
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15
hw/ppc/spapr.c
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@ -1179,11 +1179,16 @@ static void spapr_dt_chosen(SpaprMachineState *spapr, void *fdt)
_FDT(chosen = fdt_add_subnode(fdt, 0, "chosen"));
_FDT(fdt_setprop_string(fdt, chosen, "bootargs", machine->kernel_cmdline));
_FDT(fdt_setprop_cell(fdt, chosen, "linux,initrd-start",
spapr->initrd_base));
_FDT(fdt_setprop_cell(fdt, chosen, "linux,initrd-end",
spapr->initrd_base + spapr->initrd_size));
if (machine->kernel_cmdline && machine->kernel_cmdline[0]) {
_FDT(fdt_setprop_string(fdt, chosen, "bootargs",
machine->kernel_cmdline));
}
if (spapr->initrd_size) {
_FDT(fdt_setprop_cell(fdt, chosen, "linux,initrd-start",
spapr->initrd_base));
_FDT(fdt_setprop_cell(fdt, chosen, "linux,initrd-end",
spapr->initrd_base + spapr->initrd_size));
}
if (spapr->kernel_size) {
uint64_t kprop[2] = { cpu_to_be64(KERNEL_LOAD_ADDR),