# Re: \[RFC 0/5\] VirtIO RDMA

- From: Leon Romanovsky \<leon@kernel.org\>
- Date: 2021-09-22 13:09:08 
- List: virtualization
- Page: https://ratatoskr.run/virtualization/2021/09/14102340
- Thread: https://ratatoskr.run/qemu-devel/2021/09/14097381/t.md

```text
On Wed, Sep 22, 2021 at 08:08:44PM +0800, Junji Wei wrote:
> > On Sep 15, 2021, at 9:43 PM, Jason Gunthorpe [ref] wrote:

<...>

> >> 4. The FRMR api need to set key of MR through IB_WR_REG_MR.
> >>   But it is impossible to change a key of mr using uverbs.
> > 
> > FRMR is more like memory windows in user space, you can't support it
> > using just regular MRs.
> 
> It is hard to support this using uverbs, but it is easy to support
> with uRDMA that we can get full control of mrs.

What is uRDMA?

Thanks
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