Add a monitor command that allows resizing of block devices while
qemu is running. It uses the existing bdrv_truncate method already
used by qemu-img to do it's work. Compared to qemu-img the size
parsing is very simplicistic, but I think having a properly numering
object is more useful for non-humand monitor users than having
the units and relative resize parsing.
For SCSI devices the new size can be updated in Linux guests by
doing the following shell command:
echo > /sys/class/scsi_device/0:0:0:0/device/rescan
For ATA devices I don't know of a way to update the block device
size in Linux system, and for virtio-blk the next two patches
will provide an automatic update of the size when this command
is issued on the host.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Watch this:
(qemu) drive_add 0 if=none,file=tmp.img
OK
(qemu) info block
none0: type=hd removable=0 file=tmp.img ro=0 drv=raw encrypted=0
(qemu) drive_del none0
Segmentation fault (core dumped)
do_drive_del()'s code to clean up the pointer from a qdev using the
drive back to the drive needs to check whether such a device exists.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This makes the errors point to the error location, and fixes drive_add
to report errors in the monitor instead of stderr.
While there, tweak a few error messages for consistency.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
When cyls, heads or secs are out of range, the error message prints
buf, which points to the value of option "if". Bogus, may even be
null. Drop that.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Current code does not support snapshot internally to the running
image. Error in case no snapshot_file is specified.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
The monitor command is:
snapshot_blkdev <device> [snapshot-file] [format]
Default format is qcow2. For now snapshots without a snapshot-file, eg
internal snapshots, are not supported.
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
If a user decides to punish a guest by revoking its block device via
drive_del, and subsequently also attempts to remove the pci device
backing it, and the device is using blockdev_auto_del() then we get a
segfault when we attempt to access dinfo->auto_del.[1]
The fix is to check if drive_get_by_blockdev() actually returns a valid
dinfo pointer or not.
1. (qemu) pci_add auto storage file=images/test01.raw,if=virtio,id=block1,snapshot=on
(qemu) drive_del block1
(qemu) pci_del 5
*segfault*
Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
Tested-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Currently device hotplug removal code is tied to device removal via
ACPI. All pci devices that are removable via device_del() require the
guest to respond to the request. In some cases the guest may not
respond leaving the device still accessible to the guest. The management
layer doesn't currently have a reliable way to revoke access to host
resource in the presence of an uncooperative guest.
This patch implements a new monitor command, drive_del, which
provides an explicit command to revoke access to a host block device.
drive_del first quiesces the block device (qemu_aio_flush;
bdrv_flush() and bdrv_close()). This prevents further IO from being
submitted against the host device. Finally, drive_del cleans up
pointers between the drive object (host resource) and the device
object (guest resource).
Signed-off-by: Ryan Harper <ryanh@us.ibm.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This implements the rerror option for SCSI disks.
It also includes minor changes to the write path where the same code is used
that was criticized in the review for the changes to the read path required for
rerror support.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Switch tree to lookup-by-name using qemu_find_opts().
Also hook up virtfs options so qemu_find_opts works for them too.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Block device change command did not copy BDRV_O_SNAPSHOT flag. Thus
the new image did not have this flag and the file got deleted during
opening.
Fix by copying BDRV_O_SNAPSHOT flag.
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Since commit cb4e5f8e, monitor command change makes the new media
readonly iff the type hint is BDRV_TYPE_CDROM, i.e. the drive was
created with media=cdrom. The intention is to avoid changing a block
device's read-only-ness. However, BDRV_TYPE_CDROM is only a hint. It
is currently sufficent for read-only. But it's not necessary, and it
may not remain sufficient.
Use bdrv_is_read_only() instead.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
We automatically delete blockdev host parts on unplug of the guest
device. Too much magic, but we can't change that now.
The delete happens early in the guest device teardown, before the
connection to the host part is severed. Thus, the guest part's
pointer to the host part dangles for a brief time. No actual harm
comes from this, but we'll catch such dangling pointers a few commits
down the road. Clean up the dangling pointers by delaying the
automatic deletion until the guest part's pointer is gone.
Device usb-storage deliberately makes two qdev properties refer to the
same drive, because it automatically creates a second device. Again,
too much magic we can't change now. Multiple references worked okay
before, but now free_drive() dies for the second one. Zap the extra
reference.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Historically, user monitor arguments beginning with '-' (eg. '-f')
were passed as integers down to handlers.
I've maintained this behavior in the new monitor because we didn't
have a boolean type at the very beginning of QMP. Today we have it
and this behavior is causing trouble to QMP's argument checker.
This commit fixes the problem by doing the following changes:
1. User Monitor
Before: the optional arg was represented as a QInt, we'd pass 1
down to handlers if the user specified the argument or
0 otherwise
This commit: the optional arg is represented as a QBool, we pass
true down to handlers if the user specified the
argument, otherwise _nothing_ is passed
2. QMP
Before: the client was required to pass the arg as QBool, but we'd
convert it to QInt internally. If the argument wasn't passed,
we'd pass 0 down
This commit: still require a QBool, but doesn't do any conversion and
doesn't pass any default value
3. Convert existing handlers (do_eject()/do_migrate()) to the new way
Before: Both handlers would expect a QInt value, either 0 or 1
This commit: Change the handlers to accept a QBool, they handle the
following cases:
A) true is passed: the option is enabled
B) false is passed: the option is disabled
C) nothing is passed: option not specified, use
default behavior
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This changes the monitor eject_device() function to not check for
bdrv_is_inserted().
Example run where the bug manifests itself:
(output of 'info block' is stripped to include only the CD-ROM device)
(qemu) info block
ide1-cd0: type=cdrom removable=1 locked=0 [not inserted]
(qemu) change ide1-cd0 /dev/cdrom host_cdrom
(qemu) info block
ide1-cd0: type=cdrom removable=1 locked=0 file=/dev/cdrom ro=1 drv=host_cdrom encrypted=0
(qemu) eject ide1-cd0
(qemu) info block
ide1-cd0: type=cdrom removable=1 locked=0 file=/dev/cdrom ro=1 drv=host_cdrom encrypted=0
# at this point, a disk was inserted on the host CD-ROM drive
(qemu) info block
ide1-cd0: type=cdrom removable=1 locked=0 file=/dev/cdrom ro=1 drv=host_cdrom encrypted=0
(qemu) eject ide1-cd0
(qemu) info block
ide1-cd0: type=cdrom removable=1 locked=0 [not inserted]
(qemu)
The first eject command didn't work because the is_inserted() check
failed.
I have no clue why the code had the is_inserted() check, as it doesn't matter
if there is a disk present at the host drive, when the user wants the virtual
device to be disconnected from the host device.
The is_inserted() check has another side effect: a memory leak if the "change"
command is used multiple times, as do_change() calls eject_device() before
re-opening the block device, but bdrv_close() is never called.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This is the list of drives defined with drive_init(). Hide it, so it
doesn't get abused.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
do_commit() and mux_proc_byte() iterate over the list of drives
defined with drive_init(). This misses host block devices defined by
other means. Such means don't exist now, but will be introduced later
in this series.
Change them to use new bdrv_commit_all(), which iterates over all host
block devices.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
That's where they belong semantically (block device host part), even
though the actions are actually executed by guest device code.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Empty file used to create an empty drive (no media). Since commit
9dfd7c7a, it's an error: "qemu: could not open disk image : No such
file or directory". Older versions of libvirt can choke on this.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
We should use 'dinfo->serial' length, 'serial' is a pointer, so
the serial number length is currently limited to the pointer size.
This fixes https://bugs.launchpad.net/qemu/+bug/584143 and is also
valid for stable.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Anything that moves hundreds of lines out of vl.c can't be all bad.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
