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...ang situations occur during device removal when virtblk_remove() invokes del_gendisk() to synch dirty inode pages (invalidate_partition()). The below patches [4,5,6,7] also exploit a 'broken' virtqueue in order to trigger IO errors as well as to prevent final hanging IO operations. Heinz Graalfs (7): virtio_ring: add new functions virtqueue{_set_broken()/_is_broken()} s390/virtio_ccw: set virtqueue as broken if host notify failed virtio_net: avoid cpu_relax() call loop in case virtqueue is broken virtio_blk: use dummy virtqueue_notify() to detect host kick error virtio_blk: do n...

...ang situations occur during device removal when virtblk_remove() invokes del_gendisk() to synch dirty inode pages (invalidate_partition()). The below patches [4,5,6,7] also exploit a 'broken' virtqueue in order to trigger IO errors as well as to prevent final hanging IO operations. Heinz Graalfs (7): virtio_ring: add new functions virtqueue{_set_broken()/_is_broken()} s390/virtio_ccw: set virtqueue as broken if host notify failed virtio_net: avoid cpu_relax() call loop in case virtqueue is broken virtio_blk: use dummy virtqueue_notify() to detect host kick error virtio_blk: do n...

On 29/01/14 07:31, Rusty Russell wrote: > Heinz Graalfs <graalfs at linux.vnet.ibm.com> writes: >> On 23/01/14 05:51, Rusty Russell wrote: >>> Heinz Graalfs <graalfs at linux.vnet.ibm.com> writes: >>>> Hi, here is my v4 patch-set update to the v3 RFC submitted on Nov 27th. >>> >>> Hi Heinz, >&...

On 29/01/14 07:31, Rusty Russell wrote: > Heinz Graalfs <graalfs at linux.vnet.ibm.com> writes: >> On 23/01/14 05:51, Rusty Russell wrote: >>> Heinz Graalfs <graalfs at linux.vnet.ibm.com> writes: >>>> Hi, here is my v4 patch-set update to the v3 RFC submitted on Nov 27th. >>> >>> Hi Heinz, >&...

...on virtqueue_is_broken(). This function should be used to verify the state of a virtqueue when a previous virtqueue_get_buf() returned a NULL pointer. Patch [6,7,8,9] add virtqueue_is_broken() calls to handle potential errors when a virtqueue_bet_buf() doesn't deliver any more buffers. Heinz Graalfs (9): virtio_ring: change host notification API virtio_ring: let virtqueue_{kick()/notify()} return a bool virtio_net: verify if virtqueue_kick() succeeded virtio_test: verify if virtqueue_kick() succeeded virtio_ring: add new function virtqueue_is_broken() virtio_blk: verify if queue i...

...on virtqueue_is_broken(). This function should be used to verify the state of a virtqueue when a previous virtqueue_get_buf() returned a NULL pointer. Patch [6,7,8,9] add virtqueue_is_broken() calls to handle potential errors when a virtqueue_bet_buf() doesn't deliver any more buffers. Heinz Graalfs (9): virtio_ring: change host notification API virtio_ring: let virtqueue_{kick()/notify()} return a bool virtio_net: verify if virtqueue_kick() succeeded virtio_test: verify if virtqueue_kick() succeeded virtio_ring: add new function virtqueue_is_broken() virtio_blk: verify if queue i...

...adds a new notify() callback for the virtio_blk driver. When called for a lost device settings are made to prevent future request queueing. Patch 3 modifies the CIO notify handler in virtio_ccw's transport layer to pass on the lost device info to virtio's backend driver virtio_blk. Heinz Graalfs (3): virtio: add notify() callback to virtio_driver virtio_blk: add virtblk_notify() as virtio_driver's notify() callback virtio_ccw: invoke virtio_driver's notify() on CIO_GONE notification drivers/block/virtio_blk.c | 14 ++++++++++++++ drivers/s390/kvm/virtio_ccw.c | 14 +++++...

...adds a new notify() callback for the virtio_blk driver. When called for a lost device settings are made to prevent future request queueing. Patch 3 modifies the CIO notify handler in virtio_ccw's transport layer to pass on the lost device info to virtio's backend driver virtio_blk. Heinz Graalfs (3): virtio: add notify() callback to virtio_driver virtio_blk: add virtblk_notify() as virtio_driver's notify() callback virtio_ccw: invoke virtio_driver's notify() on CIO_GONE notification drivers/block/virtio_blk.c | 14 ++++++++++++++ drivers/s390/kvm/virtio_ccw.c | 14 +++++...

On Wed, Nov 27, 2013 at 11:32:39AM +0100, Heinz Graalfs wrote: > Code is added to avoid calling blk_cleanup_queue() when the surprize_removal > flag is set due to a disappeared device. It avoid hangs due to incomplete > requests (e.g. in-flight requests). Such requests must be considered as lost. Ugh. Can't we complete these immediately u...

On Wed, Nov 27, 2013 at 11:32:39AM +0100, Heinz Graalfs wrote: > Code is added to avoid calling blk_cleanup_queue() when the surprize_removal > flag is set due to a disappeared device. It avoid hangs due to incomplete > requests (e.g. in-flight requests). Such requests must be considered as lost. Ugh. Can't we complete these immediately u...

On Thu, Nov 21, 2013 at 06:12:21PM +0100, Heinz Graalfs wrote: > On 21/11/13 16:15, Michael S. Tsirkin wrote: > >On Thu, Nov 21, 2013 at 03:45:33PM +0100, Heinz Graalfs wrote: > >>virtio_ccw's notify() callback for the common IO layer invokes > >>virtio_driver's notify() callback to pass-on information to a > >&...

On Thu, Nov 21, 2013 at 06:12:21PM +0100, Heinz Graalfs wrote: > On 21/11/13 16:15, Michael S. Tsirkin wrote: > >On Thu, Nov 21, 2013 at 03:45:33PM +0100, Heinz Graalfs wrote: > >>virtio_ccw's notify() callback for the common IO layer invokes > >>virtio_driver's notify() callback to pass-on information to a > >&...

On 19/12/13 01:19, Rusty Russell wrote: > Heinz Graalfs <graalfs at linux.vnet.ibm.com> writes: >> On 17/12/13 04:42, Rusty Russell wrote: >>> Heinz Graalfs <graalfs at linux.vnet.ibm.com> writes: >>>> Hi, here is my v4 patch-set update to the v3 RFC submitted on Nov 27th. >>>> >>>> When an...

On 19/12/13 01:19, Rusty Russell wrote: > Heinz Graalfs <graalfs at linux.vnet.ibm.com> writes: >> On 17/12/13 04:42, Rusty Russell wrote: >>> Heinz Graalfs <graalfs at linux.vnet.ibm.com> writes: >>>> Hi, here is my v4 patch-set update to the v3 RFC submitted on Nov 27th. >>>> >>>> When an...

...9; requests - set surprize_removal in virtio_ccw's notify callback when a device is lost v1->v2 changes: - add include of linux/notifier.h (I also added it to the 3rd patch) - get queue lock in order to be able to use safe queue_flag_set() functions in virtblk_notify() handler Heinz Graalfs (4): virtio: add surprize_removal to virtio_device virtio_blk: avoid further request queueing on device loss virtio_blk: avoid calling blk_cleanup_queue() on device loss virtio_ccw: set surprize_removal in virtio_device if a device was lost drivers/block/virtio_blk.c | 12 +++++++++++-...

...9; requests - set surprize_removal in virtio_ccw's notify callback when a device is lost v1->v2 changes: - add include of linux/notifier.h (I also added it to the 3rd patch) - get queue lock in order to be able to use safe queue_flag_set() functions in virtblk_notify() handler Heinz Graalfs (4): virtio: add surprize_removal to virtio_device virtio_blk: avoid further request queueing on device loss virtio_blk: avoid calling blk_cleanup_queue() on device loss virtio_ccw: set surprize_removal in virtio_device if a device was lost drivers/block/virtio_blk.c | 12 +++++++++++-...

On Thu, Nov 21, 2013 at 03:45:33PM +0100, Heinz Graalfs wrote: > virtio_ccw's notify() callback for the common IO layer invokes > virtio_driver's notify() callback to pass-on information to a > backend driver if an online device disappeared. > > Signed-off-by: Heinz Graalfs <graalfs at linux.vnet.ibm.com> simple question:...

On Thu, Nov 21, 2013 at 03:45:33PM +0100, Heinz Graalfs wrote: > virtio_ccw's notify() callback for the common IO layer invokes > virtio_driver's notify() callback to pass-on information to a > backend driver if an online device disappeared. > > Signed-off-by: Heinz Graalfs <graalfs at linux.vnet.ibm.com> simple question:...

Rusty, and here is patch 9 as you suggested. Thanks. Heinz Graalfs (9): virtio_ring: change host notification API virtio_ring: let virtqueue_{kick()/notify()} return a bool virtio_net: verify if virtqueue_kick() succeeded virtio_test: verify if virtqueue_kick() succeeded virtio_ring: add new function virtqueue_is_broken() virtio_blk: verify if queue i...

Rusty, and here is patch 9 as you suggested. Thanks. Heinz Graalfs (9): virtio_ring: change host notification API virtio_ring: let virtqueue_{kick()/notify()} return a bool virtio_net: verify if virtqueue_kick() succeeded virtio_test: verify if virtqueue_kick() succeeded virtio_ring: add new function virtqueue_is_broken() virtio_blk: verify if queue i...