+ Balaton, qemu-ppc
Hi David,
On 7/6/26 5:16 PM, David Gibson wrote:
On Mon, Jul 06, 2026 at 02:37:48PM +0530, Utkarsh Verma wrote:
+Thomas, Narayana, Shiva, Harsh - FYI
Hi Alexey, David and Paolo,
Reviving this thread as would like to add the disk boot support by loading
GRUB.
Good luck, but I'm afraid I no longer have any interest in, or time to
commit to looking at ppc qemu stuff.
Thanks for responding to the query.
Let me share what we have been working on to add the qcow2 disk boot
support with VOF to get inputs from others who might have an opinion.
With below changes, we have been able to boot a qcow2 image using the
-hda option. The implementation covers:
- Partition table scanning (MBR and GPT) to locate the PReP boot partition.
- A new load_elf_ram_sym_buf() API in hw/core/loader.c that loads an ELF
image from a caller-supplied memory buffer, reusing the existing
load_elf32/load_elf64 paths internally via memfd and also added an
optional per-segment callback so callers can act on each PT_LOAD
segment, used here to update /memory@0/available via vof_claim()
- read, seek, and vscsi-report-luns OF services for block I/O needed by
GRUB.
- VTY read/write routing for GRUB console I/O.
With all of the above, we are able to boot a disk over the sPAPR vSCSI
bus. I plan to post a RFC patch series soon. Quite a few things are
referenced from the Alexey's older patch series for implementing the VOF
(https://lore.kernel.org/qemu-devel/[email protected]/#t).
Alexey, Balaton and others,
Let us know if this approach looks good.
Regards,
Utkarsh
