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Re: [RFC 0/2] virtio-rng: add a control queue

From: Amit Shah
Subject: Re: [RFC 0/2] virtio-rng: add a control queue
Date: Fri, 24 Jan 2020 13:43:49 +0100

On Thu, 2020-01-23 at 16:16 +0100, Laurent Vivier wrote:
> The kernel needs sometime to be able to cancel an ongoing command.
> For instance, if the virtio-rng device uses the egd backend
> and this backend doesn't provide data, the buffer provided by the
> kernel is kept as long as it is needed.
> On the kernel side, a read blocks until the buffer returns from QEMU.
> As the read is done with a mutex held, all the hw_random interface
> hangs and we cannot switch to another hw_random backend.
> So this series adds a control queue to the virtio-rng device to allow
> to flush the virtio-rng input queue to release the kernel mutex and
> to allow to switch to another device.
> The kernel side series can be found at:
> https://github.com/vivier/linux/commits/virtio-rng-ctrl

Did you submit the kernel series too?  Can you please CC me to it?

This will need spec changes as well, can you please point me to them

I also recall a previous discussion about this, but my search-fu is
failing to find it...


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