Re: [Qemu-devel] [PATCH 0/3] write barrier support

[Avi Kivity]

Christoph Hellwig wrote:
> Add support for write barriers that allow guests to control write
> ordering when write back cachin is enabled.
>
> For now only the simple stack of virtio on posix raw/host devices is
> supported.
>   

I suggest emulating barriers for format drivers that don't support them 
by queuing the writes in the block layer and issuing a flush_all command.

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