[Qemu-devel] [PATCH] atapi: Indicate 'medium not ready' to 'medium ready' transition via error

[Amit Shah <amit.shah@redhat.com>]

MMC-5 Table F.1 lists errors that can be thrown for the TEST_UNIT_READY
command.  Going from medium not ready to medium ready states is
communicated by throwing an error.

This adds the missing 'tray opened' event that we fail to report to
guests.  After doing this, older Linux guests properly revalidate a disc
on the change command.  HSM violation errors, which caused Linux guests
to do a soft-reset of the link, also go away:

ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
sr 1:0:0:0: CDB: Test Unit Ready: 00 00 00 00 00 00
ata2.00: cmd a0/00:00:00:00:00/00:00:00:00:00/a0 tag 0
         res 01/60:00:00:00:00/00:00:00:00:00/a0 Emask 0x3 (HSM violation)
ata2.00: status: { ERR }
ata2: soft resetting link
ata2.00: configured for MWDMA2
ata2: EH complete

Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 hw/ide/core.c |   32 ++++++++++++++++++++++++++------
 1 files changed, 26 insertions(+), 6 deletions(-)

diff --git a/hw/ide/core.c b/hw/ide/core.c
index f028ddb..5a72420 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -1253,9 +1253,16 @@ static void ide_atapi_cmd(IDEState *s)
         if (bdrv_is_inserted(s->bs) && !s->cdrom_changed) {
             ide_atapi_cmd_ok(s);
         } else {
-            s->cdrom_changed = 0;
-            ide_atapi_cmd_error(s, SENSE_NOT_READY,
-                                ASC_MEDIUM_NOT_PRESENT);
+            int sense, asc;
+
+            sense = SENSE_NOT_READY;
+            asc = ASC_MEDIUM_NOT_PRESENT;
+            if (bdrv_is_inserted(s->bs) && s->cdrom_changed) {
+                s->cdrom_changed = 0;
+                sense = SENSE_UNIT_ATTENTION;
+                asc = ASC_MEDIUM_MAY_HAVE_CHANGED;
+            }
+            ide_atapi_cmd_error(s, sense, asc);
         }
         break;
     case GPCMD_MODE_SENSE_6:
@@ -1734,11 +1741,24 @@ static void cdrom_change_cb(void *opaque, int reason)
     bdrv_get_geometry(s->bs, &nb_sectors);
     s->nb_sectors = nb_sectors;
 
-    s->sense_key = SENSE_UNIT_ATTENTION;
-    s->asc = ASC_MEDIUM_MAY_HAVE_CHANGED;
+    /*
+     * This function combines three actions a physical cdrom would do to
+     * change a disc in a drive:
+     *
+     * 1. eject the tray,
+     * 2. change the disc,
+     * 3. close the tray.
+     *
+     * Guests expect responses from us in the same order.  So first,
+     * just mark the disc changed, but provide an 'ejected' event to
+     * the guest.  Later, when the guest invokes a TEST_UNIT_READY
+     * command, we will provide with a disc change (UNIT_ATTENTION)
+     * event.
+     */
     s->cdrom_changed = 1;
     s->events.new_media = true;
-    ide_set_irq(s->bus);
+
+    ide_atapi_cmd_error(s, SENSE_NOT_READY, ASC_MEDIUM_NOT_PRESENT);
 }
 
 static void ide_cmd_lba48_transform(IDEState *s, int lba48)
-- 
1.7.4.2