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Message-ID: <20200331155049-mutt-send-email-mst@kernel.org>
Date: Tue, 31 Mar 2020 15:51:09 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Eugenio Pérez <eperezma@...hat.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Stephen Rothwell <sfr@...b.auug.org.au>,
kvm list <kvm@...r.kernel.org>,
Linux Next Mailing List <linux-next@...r.kernel.org>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>,
Christian Borntraeger <borntraeger@...ibm.com>,
Halil Pasic <pasic@...ux.ibm.com>,
Cornelia Huck <cohuck@...hat.com>
Subject: Re: [PATCH v3 0/8] vhost: Reset batched descriptors on
SET_VRING_BASE call
On Tue, Mar 31, 2020 at 09:27:56PM +0200, Eugenio Pérez wrote:
> Vhost did not reset properly the batched descriptors on SET_VRING_BASE
> event. Because of that, is possible to return an invalid descriptor to
> the guest.
>
> This series ammend this, resetting them every time backend changes, and
> creates a test to assert correct behavior. To do that, they need to
> expose a new function in virtio_ring, virtqueue_reset_free_head, only
> on test code.
>
> Another useful thing would be to check if mutex is properly get in
> vq private_data accessors. Not sure if mutex debug code allow that,
> similar to C++ unique lock::owns_lock. Not acquiring in the function
> because caller code holds the mutex in order to perform more actions.
I pushed vhost branch with patch 1, pls send patches on top of that!
> v3:
> * Rename accesors functions.
> * Make scsi and test use the accesors too.
>
> v2:
> * Squashed commits.
> * Create vq private_data accesors (mst).
>
> This is meant to be applied on top of
> c4f1c41a6094582903c75c0dcfacb453c959d457 in
> git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git.
>
> Eugenio Pérez (5):
> vhost: Create accessors for virtqueues private_data
> tools/virtio: Add --batch option
> tools/virtio: Add --batch=random option
> tools/virtio: Add --reset=random
> tools/virtio: Make --reset reset ring idx
>
> Michael S. Tsirkin (3):
> vhost: option to fetch descriptors through an independent struct
> vhost: use batched version by default
> vhost: batching fetches
>
> drivers/vhost/net.c | 28 ++--
> drivers/vhost/scsi.c | 14 +-
> drivers/vhost/test.c | 69 ++++++++-
> drivers/vhost/test.h | 1 +
> drivers/vhost/vhost.c | 271 +++++++++++++++++++++++------------
> drivers/vhost/vhost.h | 44 +++++-
> drivers/vhost/vsock.c | 14 +-
> drivers/virtio/virtio_ring.c | 29 ++++
> tools/virtio/linux/virtio.h | 2 +
> tools/virtio/virtio_test.c | 123 ++++++++++++++--
> 10 files changed, 456 insertions(+), 139 deletions(-)
>
> --
> 2.18.1
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