47 lines
1.9 KiB
Diff
47 lines
1.9 KiB
Diff
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From f42859e8791c5dc1c8b2a3e3499310d38e302fb4 Mon Sep 17 00:00:00 2001
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From: David Gibson <david@gibson.dropbear.id.au>
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Date: Mon, 26 Nov 2012 12:33:52 +1100
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Subject: [PATCH] virtio-scsi: Fix subtle (guest) endian bug
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The virtio-scsi config space is, by specification, in guest endian (which
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is ill-defined, but there you go). In virtio_scsi_get_config() we set up
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all the fields in there, using stl_raw(). Which is a problem for the
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max_channel and max_target fields, which are 16-bit, not 32-bit. For
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little-endian targets we get away with it by accident, since the first
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two bytes will still be correct, and the extra two bytes written (with
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zeroes) will be overwritten correctly by the next store.
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But for big-endian guests, this means the max_target field ends up as zero,
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which means the guest will only recognize a single disk on the virtio-scsi
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bus. This patch fixes the problem.
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Cc: Paolo Bonzini <pbonzini@redhat.com>
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Cc: Paul 'Rusty' Russell <rusty@rustcorp.com.au>
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Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 863d1050c96cff91dd478767c0da9cc288575919)
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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---
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hw/virtio-scsi.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
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index c6d5290..5fcbdd8 100644
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--- a/hw/virtio-scsi.c
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+++ b/hw/virtio-scsi.c
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@@ -534,8 +534,8 @@ static void virtio_scsi_get_config(VirtIODevice *vdev,
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stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
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stl_raw(&scsiconf->sense_size, s->sense_size);
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stl_raw(&scsiconf->cdb_size, s->cdb_size);
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- stl_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
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- stl_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
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+ stw_raw(&scsiconf->max_channel, VIRTIO_SCSI_MAX_CHANNEL);
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+ stw_raw(&scsiconf->max_target, VIRTIO_SCSI_MAX_TARGET);
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stl_raw(&scsiconf->max_lun, VIRTIO_SCSI_MAX_LUN);
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}
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--
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1.8.0.2
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