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Re: [Xen-devel] [PATCH] libxl: don't add cache mode for empty drives

On Tue, Apr 26, 2016 at 10:35:31PM -0600, Jim Fehlig wrote:
> qemu commit 91a097e7 forbids specifying the cache mode for empty
> drives. Attempting to create a domain with an empty qdisk cdrom
> results in
> qemu-system-x86_64: -drive if=ide,index=1,readonly=on,media=cdrom,
>    cache=writeback,id=ide-832: Must specify either driver or file
> Change libxl to only emit cache mode when a cdrom target is specified.

What happens then when a cdrom is inserted? I cannot seem to find the code 
in libxl_cdrom_insert that sets the cache mode. Is the default one used 


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