72 lines
2.9 KiB
Diff
72 lines
2.9 KiB
Diff
From 18d600a76319abe59dc4b5e371e5807c089f9159 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Wed, 6 Feb 2019 15:58:28 +0000
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Subject: [PATCH 2/3] scsi-disk: Don't use empty string as device id
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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Message-id: <20190206155829.14641-2-kwolf@redhat.com>
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Patchwork-id: 84253
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O-Subject: [RHEL-7.7/8.0-AV qemu-kvm-rhev PATCH 1/2] scsi-disk: Don't use empty string as device id
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Bugzilla: 1668248
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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scsi-disk includes in the Device Identification VPD page, depending on
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configuration amongst others, a vendor specific designator that consists
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either of the serial number if given or the BlockBackend name (which is
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a host detail that better shouldn't have been leaked to the guest, but
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now we have to maintain it for compatibility).
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With anonymous BlockBackends, i.e. scsi-disk devices constructed with
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drive=<node-name>, and no serial number explicitly specified, this ends
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up as an empty string. If this happens to more than one disk, we have
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accidentally signalled to the OS that this is a multipath setup, which
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is obviously not what was intended.
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Instead of using an empty string for the vendor specific designator,
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simply leave out that designator, which makes Linux detect such setups
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as separate disks again.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Reviewed-by: Eric Blake <eblake@redhat.com>
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Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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(cherry picked from commit a8f58afcdb86e266e06c9dc41a71605e570244c3)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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hw/scsi/scsi-disk.c | 14 ++++++++------
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1 file changed, 8 insertions(+), 6 deletions(-)
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diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
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index 0e9027c..93eef40 100644
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--- a/hw/scsi/scsi-disk.c
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+++ b/hw/scsi/scsi-disk.c
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@@ -652,12 +652,14 @@ static int scsi_disk_emulate_vpd_page(SCSIRequest *req, uint8_t *outbuf)
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DPRINTF("Inquiry EVPD[Device identification] "
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"buffer size %zd\n", req->cmd.xfer);
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- outbuf[buflen++] = 0x2; /* ASCII */
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- outbuf[buflen++] = 0; /* not officially assigned */
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- outbuf[buflen++] = 0; /* reserved */
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- outbuf[buflen++] = id_len; /* length of data following */
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- memcpy(outbuf + buflen, str, id_len);
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- buflen += id_len;
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+ if (id_len) {
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+ outbuf[buflen++] = 0x2; /* ASCII */
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+ outbuf[buflen++] = 0; /* not officially assigned */
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+ outbuf[buflen++] = 0; /* reserved */
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+ outbuf[buflen++] = id_len; /* length of data following */
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+ memcpy(outbuf + buflen, str, id_len);
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+ buflen += id_len;
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+ }
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if (s->qdev.wwn) {
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outbuf[buflen++] = 0x1; /* Binary */
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--
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1.8.3.1
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