File block-scsi-correctly-emulate-the-VPD-blo.patch of Package qemu.30222

From: Maxim Levitsky <mlevitsk@redhat.com>
Date: Thu, 17 Dec 2020 18:56:12 +0200
Subject: block/scsi: correctly emulate the VPD block limits page

Git-commit: 06b80795ee25d23e69747b2cb435003c6db2a6ab
References: bsc#1202364

When the device doesn't support the VPD block limits page, we emulate it even
for SCSI passthrough.

As a part of the emulation we need to add it to the 'Supported VPD Pages'

The code that does this adds it to the page, but it doesn't increase the length
of the data to be copied to the guest, thus the guest never sees the VPD block
limits page as supported.

Bump the transfer size by 1 in this case.

Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20201217165612.942849-6-mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 06b80795ee25d23e69747b2cb435003c6db2a6ab)
Signed-off-by: Lin Ma <lma@suse.com>
---
 hw/scsi/scsi-generic.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 5f5ed726f9d3deaabb747aa18848..6d08054efa1c1ff3e935ec278285 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -141,7 +141,7 @@ static int execute_command(BlockBackend *blk,
     return 0;
 }
 
-static void scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s)
+static int scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s, int len)
 {
     uint8_t page, page_idx;
 
@@ -209,8 +209,13 @@ static void scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s)
                 r->buf[page_idx] = 0xb0;
             }
             stw_be_p(r->buf + 2, lduw_be_p(r->buf + 2) + 1);
+
+            if (len < r->buflen) {
+                len++;
+            }
         }
     }
+    return len;
 }
 
 static int scsi_generic_emulate_block_limits(SCSIGenericReq *r, SCSIDevice *s)
@@ -329,7 +334,7 @@ static void scsi_read_complete(void * opaque, int ret)
         }
     }
     if (r->req.cmd.buf[0] == INQUIRY) {
-        scsi_handle_inquiry_reply(r, s);
+        len = scsi_handle_inquiry_reply(r, s, len);
     }
 
 req_complete: