Re: [Qemu-devel] [PATCH 0/2] Serious bugs in the handling of writeback caching

[Stefan Hajnoczi]

On Thu, Sep 19, 2013 at 06:48:52PM +0200, Paolo Bonzini wrote:
> The first bug is simply that in 1.6.0 the default was changed by mistake
> to cache=unsafe.  This affects all block drivers.  It is fixed in the
> first patch.
> 
> The second is that Linux guests that support the CONFIG_WCE option were
> mistaken into thinking that caching was writethrough, and thus did not
> send any flush.  The bug is in QEMU, and is fixed by the second patch.
> 
> Paolo Bonzini (2):
>   blockdev: do not default cache.no-flush to true
>   virtio-blk: do not relay a previous driver's WCE configuration to the
>     current
> 
>  blockdev.c                     | 2 +-
>  hw/block/virtio-blk.c          | 8 ++++++--
>  include/hw/virtio/virtio-blk.h | 1 +
>  3 files changed, 8 insertions(+), 3 deletions(-)
> 
> -- 
> 1.8.3.1
> 
> 

Thanks, applied to my block tree:
https://github.com/stefanha/qemu/commits/block

Stefan