Re: [Qemu-devel] [v7 Patch 4/5]Qemu: Add commandline -drive option 'hostcache'

[Kevin Wolf <kwolf@redhat.com>]

Am 14.10.2011 13:19, schrieb Supriya Kannery:
> On 10/12/2011 08:00 PM, Kevin Wolf wrote:
>> Am 11.10.2011 05:11, schrieb Supriya Kannery:
>>> qemu command option 'hostcache' added to -drive for block devices.
>>> While starting a VM from qemu commandline, this option can be used
>>> for setting host cache usage for block data access. Simultaneous
>>> use of 'hostcache' and 'cache' options not allowed.
>>>
>>> Signed-off-by: Supriya Kannery<supriyak@linux.vnet.ibm.com>
>>
>> I'm not sure if introducing this alone makes sense. I think I would only
>> do it when we introduce more options that allow replacing all cache=...
>> options by other parameters.
>>
> 
> Can we do transition to alternatives for 'cache=' in a phased manner?
> Until all other params are ready, we can allow hostcache (as well
> as other params as and when they are ready) in cmdline with the
> condition that 'cache=x', if specified, overrides these params.
> Once we have all other params ready, 'cache=' can be replaced completely.

I guess that would be good enough. There's still not much use in
specifying hostcache=... at the same time as cache=... but at least it
doesn't take away other options then.

Kevin