linux-kernel - Re: [RFC PATCH 00/10] vdpa: get/set_config() rework

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Message-ID: <20210301081730.45cqbq7s6fbrdkhw@steredhat>
Date:   Mon, 1 Mar 2021 09:17:30 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [RFC PATCH 00/10] vdpa: get/set_config() rework

nice ping :-)

On Tue, Feb 16, 2021 at 10:44:44AM +0100, Stefano Garzarella wrote:
>Following the discussion with Michael and Jason [1], I reworked a bit
>get/set_config() in vdpa.
>
>I changed vdpa_get_config() to check the boundaries and added vdpa_set_config().
>When 'offset' or 'len' parameters exceed boundaries, we limit the reading to
>the available configuration space in the device, and we return the amount of
>bytes read/written.
>
>In this way the user space can pass buffers bigger than config space.
>I also returned the amount of bytes read and written to user space.
>
>Patches also available here:
>https://github.com/stefano-garzarella/linux/tree/vdpa-get-set-config-refactoring
>
>Thanks for your comments,
>Stefano
>
>[1] https://lkml.org/lkml/2021/2/10/350
>
>Stefano Garzarella (10):
>  vdpa: add get_config_size callback in vdpa_config_ops
>  vdpa: check vdpa_get_config() parameters and return bytes read
>  vdpa: add vdpa_set_config() helper
>  vdpa: remove param checks in the get/set_config callbacks
>  vdpa: remove WARN_ON() in the get/set_config callbacks
>  virtio_vdpa: use vdpa_set_config()
>  vhost/vdpa: use vdpa_set_config()
>  vhost/vdpa: allow user space to pass buffers bigger than config space
>  vhost/vdpa: use get_config_size callback in
>    vhost_vdpa_config_validate()
>  vhost/vdpa: return configuration bytes read and written to user space
>
> include/linux/vdpa.h              | 22 ++++-------
> drivers/vdpa/ifcvf/ifcvf_base.c   |  3 +-
> drivers/vdpa/ifcvf/ifcvf_main.c   |  8 +++-
> drivers/vdpa/mlx5/net/mlx5_vnet.c |  9 ++++-
> drivers/vdpa/vdpa.c               | 51 ++++++++++++++++++++++++
> drivers/vdpa/vdpa_sim/vdpa_sim.c  | 15 +++++---
> drivers/vhost/vdpa.c              | 64 ++++++++++++++++---------------
> drivers/virtio/virtio_vdpa.c      |  3 +-
> 8 files changed, 116 insertions(+), 59 deletions(-)
>
>-- 
>2.29.2
>
>_______________________________________________
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>Virtualization@...ts.linux-foundation.org
>https://lists.linuxfoundation.org/mailman/listinfo/virtualization
>

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