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# Date Author Comment
1987530f 01/22/2009 08:57 pm aliguori

qcow2 format: keep 'num_free_bytes', and show it upon 'info blockstats' (Uri Lublin)

'num_free_bytes' is the number of non-allocated bytes below highest-allocation.
It's useful, together with the highest-allocation, to figure out how
fragmented the image is, and how likely it will run out-of-space soon....
c4218205 01/22/2009 08:57 pm aliguori

block-qcow2: export highest_allocated through BlockDriverInfo and get_info() (Uri Lublin)

Signed-off-by: Uri Lublin <>
Signed-off-by: Anthony Liguori <>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6405 c046a42c-6fe2-441c-8c8c-71466251a162
3b69e4b9 01/22/2009 06:59 pm aliguori

Vectored block device API (Avi Kivity)

Most devices that are capable of DMA are also capable of scatter-gather.
With the memory mapping API, this means that the device code needs to be
able to access discontiguous host memory regions.

For block devices, this translates to vectored I/O. This patch implements...
4dc822d7 12/04/2008 11:39 pm aliguori

Use writeback caching by default with qcow2

qcow2 writes a cluster reference count on every cluster update. This causes
performance to crater when using anything but cache=writeback. This is most
noticeable when using savevm. Right now, qcow2 isn't a reliable format...
f3d54fc4 11/25/2008 11:50 pm aliguori

Abstract out geometry detection code from IDE for reuse

Virtio will want to use the geometry detection code. It doesn't belong
in ide.c anyway.

Signed-off-by: Anthony Liguori <>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5797 c046a42c-6fe2-441c-8c8c-71466251a162
4fc9af53 11/08/2008 06:27 pm aliguori

Use an option rom instead of boot sector for -kernel

Generate an option rom instead of using a hijacked boot sector for kernel
booting. This just requires adding a small option ROM header and a few more
instructions to the boot sector to take over the int19 vector and run our...
9f7965c7 10/14/2008 05:42 pm aliguori

Expand cache= option and use write-through caching by default

This patch changes the cache= option to accept none, writeback, or writethough
to control the host page cache behavior. By default, writethrough caching is
now used which internally is implemented by using O_DSYNC to open the disk...
c6ca28d6 10/06/2008 04:55 pm aliguori

Add bdrv_flush_all()

This patch adds a bdrv_flush_all() function. It's necessary to ensure that all
IO operations have been flushed to disk before completely a live migration.

N.B. we don't actually use this now. We really should flush the block drivers...
a76bab49 09/22/2008 10:17 pm aliguori

Refactor AIO to allow multiple AIO implementations

This patch refactors the AIO layer to allow multiple AIO implementations. It's
only possible because of the recent signalfd() patch.

Right now, the AIO infrastructure is pretty specific to the block raw backend....
03ff3ca3 09/15/2008 06:51 pm aliguori

Use common objects for qemu-img and qemu-nbd

Right now, we sprinkle #if defined(QEMU_IMG) && defined(QEMU_NBD) all over the
code. It's ugly and causes us to have to build multiple object files for
linking against qemu and the tools.

This patch introduces a new file, qemu-tool.c which contains enough for...
baf35cb9 09/10/2008 06:45 pm aliguori

Use signalfd() to work around signal/select race

This patch introduces signalfd() to work around the signal/select race in
checking for AIO completions. For platforms that don't support signalfd(), we
emulate it with threads.

There was a long discussion about this approach. I don't believe there are any...
75818250 07/03/2008 04:41 pm ths

Allow QEMU to connect directly to an NBD server, by Laurent Vivier.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4838 c046a42c-6fe2-441c-8c8c-71466251a162
f58c7b35 06/06/2008 12:53 am ths

New qemu-img convert -B option, by Marc Bevand.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4672 c046a42c-6fe2-441c-8c8c-71466251a162
b5eff355 03/12/2008 01:30 am aurel32

Revert fix for CVE-2008-0928. Will be fixed in a different way later.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4041 c046a42c-6fe2-441c-8c8c-71466251a162
902b27d0 03/11/2008 07:17 pm aurel32

Fix CVE-2008-0928 - insufficient block device address range checking

Qemu 0.9.1 and earlier does not perform range checks for block device
read or write requests, which allows guest host users with root
privileges to access arbitrary memory and escape the virtual machine....
985a03b0 12/24/2007 06:10 pm ths

Real SCSI device passthrough (v4), by Laurent Vivier.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3851 c046a42c-6fe2-441c-8c8c-71466251a162
33f00271 12/24/2007 04:33 pm balrog

Add "cache" parameter to "-drive" (Laurent Vivier).

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3848 c046a42c-6fe2-441c-8c8c-71466251a162
96b8f136 12/17/2007 03:35 am ths

Fix bdrv_get_geometry to return uint64_t, by Andre Przywara.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3825 c046a42c-6fe2-441c-8c8c-71466251a162
a36e69dd 12/02/2007 07:18 am ths

Collecting block device statistics, by Richard W.M. Jones.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3760 c046a42c-6fe2-441c-8c8c-71466251a162
87ecb68b 11/17/2007 07:14 pm pbrook

Break up vl.h.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3674 c046a42c-6fe2-441c-8c8c-71466251a162
faf07963 11/11/2007 04:51 am pbrook

Split block API from vl.h.
Remove QEMU_TOOL. Replace with QEMU_IMG and NEED_CPU_H.
Avoid linking qemu-img against whole system emulatior.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3578 c046a42c-6fe2-441c-8c8c-71466251a162