Re: [virtio-dev] Re: Transparent compress in virtio

[Stefan Hajnoczi <stefanha@redhat.com>]

On Wed, Apr 29, 2020 at 02:00:39AM +0000, keens keens wrote:
> I want to compress all the data or files when the apps in VMs writes to a pass-through block device via kvm virtio.
> And decompress the data when the apps in VMs trying to read the data from the pass-through block device on host.
> 
> My idea is to add a data transform layer into virtio architecture for the purpose of transparent compress.
> I am reading the virtio.c, virtio_ring.c code, but have not found the place where I can do the data compress.
> Is it feasible that we can add a filter into the virtio, and there is a chance to do data compress or encrypt in the filter?

Can you use existing volume-level compression features instead of
reimplementing compression in virtio-specific code?

For example, the VDO device-mapper target is available for Linux:
https://github.com/dm-vdo/kvdo
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/deduplicating_and_compressing_storage/deploying-vdo_deduplicating-and-compressing-storage

If not, can you explain your use case in more detail?

Thanks,
Stefan

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