[PATCH 0/3] rework on the IRQ hardening of virtio

[Jason Wang <jasowang@redhat.com>]

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.

To unbreak legacy setups that may generate IRQ before DRIVER_OK, a
module parameter is introduced to disable the hardening by
default. The features can then be turned on the setups that the
hardening is needed (e.g the confidential computing and other cases).

Please review.

Thanks

Jason Wang (2):
  virtio: use virtio_reset_device() when possible
  virtio: harden vring IRQ

Stefano Garzarella (1):
  virtio: use virtio_device_ready() in virtio_device_restore()

 drivers/virtio/virtio.c       | 28 ++++++++++++++++++++++++----
 drivers/virtio/virtio_ring.c  |  9 ++++++++-
 include/linux/virtio.h        |  4 ++++
 include/linux/virtio_config.h | 25 +++++++++++++++++++++++++
 4 files changed, 61 insertions(+), 5 deletions(-)

-- 
2.25.1

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