BlockDriverState member removable controls whether virtual media change (monitor commands change, eject) is allowed. It is set when the "type hint" is BDRV_TYPE_CDROM or BDRV_TYPE_FLOPPY.
The type hint is only set by drive_init(). It sets BDRV_TYPE_FLOPPY for if=floppy. It sets BDRV_TYPE_CDROM for media=cdrom and if=ide, scsi, xen, or none. if=ide and if=scsi work, because the type hint makes it a CD-ROM. if=xen likewise, I think. For the same reason, if=none works when it's used by ide-drive or scsi-disk. For other guest devices, there are problems: * fdc: you can't change virtual media $ qemu [...] -drive if=none,id=foo,... -global isa-fdc.driveA=foo QEMU 0.12.50 monitor - type 'help' for more information (qemu) eject foo Device 'foo' is not removable unless you add media=cdrom, but that makes it readonly. * virtio: if you add media=cdrom, you can change virtual media. If you eject, the guest gets I/O errors. If you change, the guest sees the drive's contents suddenly change. * scsi-generic: if you add media=cdrom, you can change virtual media. I didn't test what that does to the guest or the physical device, but it can't be pretty. Signed-off-by: Markus Armbruster <arm...@redhat.com> --- block.c | 8 ++++++++ block.h | 1 + hw/fdc.c | 10 ++++++++-- hw/ide/core.c | 1 + hw/scsi-disk.c | 5 ++++- hw/scsi-generic.c | 1 + hw/virtio-blk.c | 1 + 7 files changed, 24 insertions(+), 3 deletions(-) diff --git a/block.c b/block.c index 34055e0..2ae4275 100644 --- a/block.c +++ b/block.c @@ -1292,6 +1292,14 @@ BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read) return is_read ? bs->on_read_error : bs->on_write_error; } +void bdrv_set_removable(BlockDriverState *bs, int removable) +{ + bs->removable = removable; + if (removable && bs == bs_snapshots) { + bs_snapshots = NULL; + } +} + int bdrv_is_removable(BlockDriverState *bs) { return bs->removable; diff --git a/block.h b/block.h index 012c2a1..3d03b3e 100644 --- a/block.h +++ b/block.h @@ -162,6 +162,7 @@ int bdrv_get_translation_hint(BlockDriverState *bs); void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error, BlockErrorAction on_write_error); BlockErrorAction bdrv_get_on_error(BlockDriverState *bs, int is_read); +void bdrv_set_removable(BlockDriverState *bs, int removable); int bdrv_is_removable(BlockDriverState *bs); int bdrv_is_read_only(BlockDriverState *bs); int bdrv_is_sg(BlockDriverState *bs); diff --git a/hw/fdc.c b/hw/fdc.c index 1496cfa..6c74878 100644 --- a/hw/fdc.c +++ b/hw/fdc.c @@ -1847,10 +1847,16 @@ static void fdctrl_result_timer(void *opaque) static void fdctrl_connect_drives(FDCtrl *fdctrl) { unsigned int i; + FDrive *drive; for (i = 0; i < MAX_FD; i++) { - fd_init(&fdctrl->drives[i]); - fd_revalidate(&fdctrl->drives[i]); + drive = &fdctrl->drives[i]; + + fd_init(drive); + fd_revalidate(drive); + if (drive->bs) { + bdrv_set_removable(drive->bs, 1); + } } } diff --git a/hw/ide/core.c b/hw/ide/core.c index cc4591b..ebdceb5 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -2629,6 +2629,7 @@ void ide_init_drive(IDEState *s, BlockDriverState *bs, pstrcpy(s->version, sizeof(s->version), QEMU_VERSION); } ide_reset(s); + bdrv_set_removable(bs, s->is_cdrom); } static void ide_init1(IDEBus *bus, int unit) diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c index 9c78979..2211245 100644 --- a/hw/scsi-disk.c +++ b/hw/scsi-disk.c @@ -1049,6 +1049,7 @@ static void scsi_destroy(SCSIDevice *dev) static int scsi_disk_initfn(SCSIDevice *dev) { SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev); + int is_cd; DriveInfo *dinfo; if (!s->qdev.conf.bs) { @@ -1056,6 +1057,7 @@ static int scsi_disk_initfn(SCSIDevice *dev) return -1; } s->bs = s->qdev.conf.bs; + is_cd = bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM; if (!s->serial) { /* try to fall back to value set with legacy -drive serial=... */ @@ -1072,7 +1074,7 @@ static int scsi_disk_initfn(SCSIDevice *dev) return -1; } - if (bdrv_get_type_hint(s->bs) == BDRV_TYPE_CDROM) { + if (is_cd) { s->qdev.blocksize = 2048; } else { s->qdev.blocksize = s->qdev.conf.logical_block_size; @@ -1081,6 +1083,7 @@ static int scsi_disk_initfn(SCSIDevice *dev) s->qdev.type = TYPE_DISK; qemu_add_vm_change_state_handler(scsi_dma_restart_cb, s); + bdrv_set_removable(s->bs, is_cd); return 0; } diff --git a/hw/scsi-generic.c b/hw/scsi-generic.c index 79347f4..3915e78 100644 --- a/hw/scsi-generic.c +++ b/hw/scsi-generic.c @@ -509,6 +509,7 @@ static int scsi_generic_initfn(SCSIDevice *dev) DPRINTF("block size %d\n", s->qdev.blocksize); s->driver_status = 0; memset(s->sensebuf, 0, sizeof(s->sensebuf)); + bdrv_set_removable(s->bs, 0); return 0; } diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c index 71c5d21..f0b3ba5 100644 --- a/hw/virtio-blk.c +++ b/hw/virtio-blk.c @@ -500,6 +500,7 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf) qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); register_savevm("virtio-blk", virtio_blk_id++, 2, virtio_blk_save, virtio_blk_load, s); + bdrv_set_removable(s->bs, 0); return &s->vdev; } -- 1.6.6.1