linux-kernel - Re: [PATCH V2 0/5] rework on the IRQ hardening of virtio

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Date:   Wed, 6 Apr 2022 07:36:06 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, maz@...nel.org, tglx@...utronix.de,
        peterz@...radead.org, sgarzare@...hat.com
Subject: Re: [PATCH V2 0/5] rework on the IRQ hardening of virtio

On Wed, Apr 06, 2022 at 04:35:33PM +0800, Jason Wang wrote:
> Hi All:
> 
> This is a rework on the IRQ hardening for virtio which is done
> previously by the following commits are reverted:
> 
> 9e35276a5344 ("virtio_pci: harden MSI-X interrupts")
> 080cd7c3ac87 ("virtio-pci: harden INTX interrupts")
> 
> The reason is that it depends on the IRQF_NO_AUTOEN which may conflict
> with the assumption of the affinity managed IRQ that is used by some
> virtio drivers. And what's more, it is only done for virtio-pci but
> not other transports.
> 
> In this rework, I try to implement a general virtio solution which
> borrows the idea of the INTX hardening by introducing a boolean for
> virtqueue callback enabling and toggle it in virtio_device_ready()
> and virtio_reset_device(). Then vring_interrupt() can simply check and
> return early if the driver is not ready.


All of a sudden all patches are having a wrong mime type.

It is application/octet-stream; should be text/plain

Pls fix and repost, thanks!

> Please review.
> 
> Changes since v1:
> 
> - Use transport specific irq synchronization method when possible
> - Drop the module parameter and enable the hardening unconditonally
> - Tweak the barrier/ordering facilities used in the code
> - Reanme irq_soft_enabled to driver_ready
> - Avoid unnecssary IRQ synchornization (e.g during boot)
> 
> Jason Wang (4):
>   virtio: use virtio_reset_device() when possible
>   virtio: introduce config op to synchronize vring callbacks
>   virtio-pci: implement synchronize_vqs()
>   virtio: harden vring IRQ
> 
> Stefano Garzarella (1):
>   virtio: use virtio_device_ready() in virtio_device_restore()
> 
>  drivers/virtio/virtio.c            | 20 ++++++++++++++++----
>  drivers/virtio/virtio_pci_common.c | 14 ++++++++++++++
>  drivers/virtio/virtio_pci_common.h |  2 ++
>  drivers/virtio/virtio_pci_legacy.c |  1 +
>  drivers/virtio/virtio_pci_modern.c |  2 ++
>  drivers/virtio/virtio_ring.c       |  9 ++++++++-
>  include/linux/virtio.h             |  2 ++
>  include/linux/virtio_config.h      | 24 ++++++++++++++++++++++++
>  8 files changed, 69 insertions(+), 5 deletions(-)
> 
> -- 
> 2.25.1