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From 3c469960b02ee2645f582a8f1c072308754aff96 Mon Sep 17 00:00:00 2001
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Thu, 20 Dec 2018 12:30:59 +0000
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Subject: [PATCH 4/8] scsi-disk: Block Device Characteristics emulation fix
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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: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <20181220123103.29579-5-pbonzini@redhat.com>
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Patchwork-id: 83717
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O-Subject: [PATCH 4/8] scsi-disk: Block Device Characteristics emulation fix
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Bugzilla: 1639957
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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From: Daniel Henrique Barboza <danielhb413@gmail.com>
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The current BDC VPD page (page 0xb1) is too short. This can be
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seen running sg_utils:
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$ sg_vpd --page=bdc /dev/sda
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Block device characteristics VPD page (SBC):
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Block device characteristics VPD page length too short=8
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By the SCSI spec, the expected size of the SBC page is 0x40.
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There is no telling how the guest will behave with a shorter
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message - it can ignore it, or worse, make (wrong)
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assumptions.
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This patch fixes the emulation by setting the size to 0x40.
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This is the output of the previous sg_vpd command after
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applying it:
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$ sg_vpd --page=bdc /dev/sda -v
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inquiry cdb: 12 01 b1 00 fc 00
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Block device characteristics VPD page (SBC):
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[PQual=0 Peripheral device type: disk]
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Medium rotation rate is not reported
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Product type: Not specified
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WABEREQ=0
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WACEREQ=0
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Nominal form factor not reported
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FUAB=0
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VBULS=0
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To improve readability, this patch also adds the VBULS value
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explictly and add comments on the existing fields we're
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setting.
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Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
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Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 740842c9656cd5dbc9ccf2ea0c3a74f0ba35144a)
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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 | 7 ++++---
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1 file changed, 4 insertions(+), 3 deletions(-)
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diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
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index b3d53ec..b8a27d6 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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@@ -774,11 +774,12 @@ int scsi_disk_emulate_vpd_page(SCSIRequest *req, uint8_t *outbuf)
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}
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case 0xb1: /* block device characteristics */
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{
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- buflen = 8;
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+ buflen = 0x40;
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outbuf[4] = (s->rotation_rate >> 8) & 0xff;
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outbuf[5] = s->rotation_rate & 0xff;
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- outbuf[6] = 0;
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- outbuf[7] = 0;
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+ outbuf[6] = 0; /* PRODUCT TYPE */
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+ outbuf[7] = 0; /* WABEREQ | WACEREQ | NOMINAL FORM FACTOR */
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+ outbuf[8] = 0; /* VBULS */
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break;
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}
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case 0xb2: /* thin provisioning */
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--
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1.8.3.1
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