LUNs >= 256 have to be encoded with the so-called "flat space addressing method" for virtio-scsi, where an additional bit has to be set. SLOF already took care of this with the following commit:
https://git.qemu.org/?p=SLOF.git;a=commitdiff;h=f72a37713fea47da (see https://bugzilla.redhat.com/show_bug.cgi?id=1431584 for details) But QEMU does not use this encoding yet for device tree paths that have to be handed over to SLOF to deal with the "bootindex" property, so SLOF currently fails to boot from virtio-scsi devices with LUNs >= 256 in the right boot order. Fix it by using the bit to indicate the "flat space addressing method" for LUNs >= 256. Signed-off-by: Thomas Huth <th...@redhat.com> --- hw/ppc/spapr.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index d682f01..ff2eec4 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -2643,6 +2643,10 @@ static char *spapr_get_fw_dev_path(FWPathProvider *p, BusState *bus, * swap 0100 or 10 << or 20 << ( target lun-id -- srplun ) */ unsigned id = 0x1000000 | (d->id << 16) | d->lun; + if (d->lun >= 256) { + /* Use the LUN "flat space addressing method" */ + id |= 0x4000; + } return g_strdup_printf("%s@%"PRIX64, qdev_fw_name(dev), (uint64_t)id << 32); } else if (usb) { -- 1.8.3.1
