On Tue, Sep 02, 2014 at 02:09:44AM -0700, Sanjay Kumar2 wrote:
> Please let me know how to test bdrv_co_discard interface. I mean what steps I 
> need to do on KVM host and inside guest to do end to end testing of this 
> interface. I have implemented a network protocol based block driver and 
> defined bdrv_co_discard interface as well which free the blocks on the remote 
> storage device.

Use a virtio-scsi storage controller and then the guest can send SCSI
discard commands.  Make sure to use the -drive ...,discard=unmap option,
otherwise discard commands are silently ignored.

Stefan

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