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.
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
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