linux-kernel - [PATCH 0/4] hwrng: virtio

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Message-Id: <20210922170903.577801-1-lvivier@redhat.com>
Date:   Wed, 22 Sep 2021 19:08:59 +0200
From:   Laurent Vivier <lvivier@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Alexander Potapenko <glider@...gle.com>,
        linux-crypto@...r.kernel.org, Dmitriy Vyukov <dvyukov@...gle.com>,
        rusty@...tcorp.com.au, amit@...nel.org, akong@...hat.com,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Matt Mackall <mpm@...enic.com>,
        virtualization@...ts.linux-foundation.org,
        Laurent Vivier <lvivier@...hat.com>
Subject: [PATCH 0/4] hwrng: virtio - add an internal buffer

hwrng core uses two buffers that can be mixed in the virtio-rng queue.

This series fixes the problem by adding an internal buffer in virtio-rng.

Once the internal buffer is added, we can fix two other problems:

- to be able to release the driver without waiting the device releases the
  buffer

- actually returns some data when wait=0 as we can have some already
  available data

It also tries to improve the performance by always having a buffer in
the queue of the device.

Laurent Vivier (4):
  hwrng: virtio - add an internal buffer
  hwrng: virtio - don't wait on cleanup
  hwrng: virtio - don't waste entropy
  hwrng: virtio - always add a pending request

 drivers/char/hw_random/virtio-rng.c | 84 +++++++++++++++++++++--------
 1 file changed, 63 insertions(+), 21 deletions(-)

-- 
2.31.1