[Qemu-devel] [PATCH v2] make windows notice media change

[Gleb Natapov]

Windows seems to be very stupid about cdrom media change. It polls
cdrom status and if status goes ready->media not present->ready
it assumes that media was changed. If "media not present" step doesn't
happen even if "medium may have changed" was seen it assumes media
haven't changed. Fake "media not present" step.

Signed-off-by: Gleb Natapov <address@hidden>
---
v1->v2:
  do not reuse media_changed. Save/restore on migration.

diff --git a/hw/ide.c b/hw/ide.c
index 1e56786..b8f35ad 100644
--- a/hw/ide.c
+++ b/hw/ide.c
@@ -418,6 +418,7 @@ typedef struct IDEState {
     /* ATAPI specific */
     uint8_t sense_key;
     uint8_t asc;
+    uint8_t cdrom_changed;
     int packet_transfer_size;
     int elementary_transfer_size;
     int io_buffer_index;
@@ -1644,9 +1645,10 @@ static void ide_atapi_cmd(IDEState *s)
     }
     switch(s->io_buffer[0]) {
     case GPCMD_TEST_UNIT_READY:
-        if (bdrv_is_inserted(s->bs)) {
+        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);
         }
@@ -2106,7 +2108,7 @@ static void cdrom_change_cb(void *opaque)
 
     s->sense_key = SENSE_UNIT_ATTENTION;
     s->asc = ASC_MEDIUM_MAY_HAVE_CHANGED;
-
+    s->cdrom_changed = 1;
     ide_set_irq(s);
 }
 
@@ -2870,6 +2872,7 @@ static void ide_save(QEMUFile* f, IDEState *s)
 
     qemu_put_8s(f, &s->sense_key);
     qemu_put_8s(f, &s->asc);
+    qemu_put_8s(f, &s->cdrom_changed);
     /* XXX: if a transfer is pending, we do not save it yet */
 }
 
@@ -2898,6 +2901,7 @@ static void ide_load(QEMUFile* f, IDEState *s)
 
     qemu_get_8s(f, &s->sense_key);
     qemu_get_8s(f, &s->asc);
+    qemu_get_8s(f, &s->cdrom_changed);
     /* XXX: if a transfer is pending, we do not save it yet */
 }
 
@@ -3219,7 +3223,7 @@ static int pci_ide_load(QEMUFile* f, void *opaque, int 
version_id)
     PCIIDEState *d = opaque;
     int ret, i;
 
-    if (version_id != 2)
+    if (version_id != 3)
         return -EINVAL;
     ret = pci_device_load(&d->dev, f);
     if (ret < 0)
@@ -3339,7 +3343,7 @@ void pci_cmd646_ide_init(PCIBus *bus, BlockDriverState 
**hd_table,
     ide_init2(&d->ide_if[0], hd_table[0], hd_table[1], irq[0]);
     ide_init2(&d->ide_if[2], hd_table[2], hd_table[3], irq[1]);
 
-    register_savevm("ide", 0, 2, pci_ide_save, pci_ide_load, d);
+    register_savevm("ide", 0, 3, pci_ide_save, pci_ide_load, d);
     qemu_register_reset(cmd646_reset, d);
     cmd646_reset(d);
 }
--
                        Gleb.