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[libvirt-users] Configure QCow2 L2 Cache through virt domain XML



Hello, i was wondering if it is possible to configure the l2 cache of a qcow2 image through the domain xml.
I cannot find any documentation about it... the only thing i've found is that i can pass custom options to qemu command line through the <qemu:commandline> tag, but, to my understanding, that would mean entirely remove the <disk> tag for the image and rewrite it as a list of args for the command line.
Isn't there an easier way?

An example of what i'm speaking about is: file=hd.qcow2,l2-cache-size=4194304,refcount-cache-size=262144

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