[PATCH v3 0/4] virtio short improvements

[Parav Pandit via Virtualization <virtualization@lists.linux-foundation.org>]

Hi,

This series contains small improvements for virtio pci driver.
The main idea is to support surprise removal of virtio pci device when
the driver is already loaded. Future patches will further improve other
areas of hotplug.

Patches 1 to 3 prepare the code to handle surprise removal by marking
the device as broken in patch-4.

Patch summary:
patch-1: ensures that compiler optimization doesn't occur on vq->broken
         flag
patch-2: maintains the mirror sequence on VQ delete and VQ create
patch-3: protects vqs list for simultaneous access from reader and a writer
patch-4: handles surprise removal of virtio pci device which avoids
         call trace and system lockup

---
changelog:
v2->v3:
 - updated commit message to mention that patch-1 is theoretical fix
v1->v2:
 - updated commit log for WRITE_ONCE usage
 - improved vqs protection patch-3 for using natural structure alignment
v0->v1:
 - fixed below comments from Michael
 - fixed typo in patch4 in comment
 - using WRITE_ONCE instead of smp_store_release()
 - using spinlock instead of rwlock
 - improved comment in patch
 - removed fixes tag in patch-1


Parav Pandit (4):
  virtio: Improve vq->broken access to avoid any compiler optimization
  virtio: Keep vring_del_virtqueue() mirror of VQ create
  virtio: Protect vqs list access
  virtio_pci: Support surprise removal of virtio pci device

 drivers/virtio/virtio.c            |  1 +
 drivers/virtio/virtio_pci_common.c |  7 +++++++
 drivers/virtio/virtio_ring.c       | 17 ++++++++++++++---
 include/linux/virtio.h             |  1 +
 4 files changed, 23 insertions(+), 3 deletions(-)

-- 
2.27.0

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