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From ee04d835a5a44c7f2ca4cc42f5603879b64a9ebd Mon Sep 17 00:00:00 2001
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From: David Gibson <dgibson@redhat.com>
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Date: Wed, 9 Sep 2015 02:03:04 +0200
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Subject: spapr: Reduce advertised max LUNs for spapr_vscsi
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Patchwork-id: 67711
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O-Subject: [RHEL7.2 qemu-kvm-rhev PATCH] spapr: Reduce advertised max LUNs for spapr_vscsi
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Bugzilla: 1260464
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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The implementation of the PAPR paravirtual SCSI adapter currently
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allows up to 32 LUNs (max_lun == 31). However the adapter isn't really
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designed to support lots of devices - the PowerVM implementation only
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ever puts one disk per vSCSI controller.
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More specifically, the Linux guest side vscsi driver (the only one we
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really care about) is hardcoded to allow a maximum of 8 LUNs.
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So, reduce the number of LUNs on the qemu side to 8, so we don't
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falsely advertise that more LUNs can work.
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Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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Signed-off-by: David Gibson <dgibson@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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(cherry picked from commit 6c166e382c232ba4e527b4fc5ca9fdea151498d9)
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(cherry picked from commit 9eadef5817e22891efc509ff1af6f0d14545b2b0)
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(cherry picked from commit dea0aabfbf919f28cf04db7343c42dc423fdf79b)
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(cherry picked from commit 6aef4d0da0a410a8224dec70743c32d4e10eee8b)
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(cherry picked from commit 50fdb5661adeeb0867bbaae8cd9ac55d71499231)
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---
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hw/scsi/spapr_vscsi.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/hw/scsi/spapr_vscsi.c b/hw/scsi/spapr_vscsi.c
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index a9e49c7..3a06b2f 100644
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--- a/hw/scsi/spapr_vscsi.c
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+++ b/hw/scsi/spapr_vscsi.c
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@@ -1178,7 +1178,7 @@ static const struct SCSIBusInfo vscsi_scsi_info = {
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.tcq = true,
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.max_channel = 7, /* logical unit addressing format */
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.max_target = 63,
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- .max_lun = 31,
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+ .max_lun = 7,
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.transfer_data = vscsi_transfer_data,
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.complete = vscsi_command_complete,
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--
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1.8.3.1
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