similar to: [PATCH v2 0/2] virtio-balloon: tweak config_changed

Since virtio-ccw doesn't work with accessing to the config space inside an interrupt context, this patch series avoids that issue by moving the config register accesses to the related workqueue contexts. v2->v3 ChangeLog: - rename cmd_id_received to cmd_id_received_cache, and have call sites read the latest value via virtio_balloon_cmd_id_received. (Still kept Cornelia and

On Fri, Jan 04, 2019 at 03:11:52PM +0800, Wei Wang wrote: > virtio-ccw has deadlock issues with reading the config space inside the > interrupt context, so we tweak the virtballoon_changed implementation > by moving the config read operations into the related workqueue contexts. > The config_read_bitmap is used as a flag to the workqueue callbacks > about the related config fields

On Fri, Jan 04, 2019 at 03:11:52PM +0800, Wei Wang wrote: > virtio-ccw has deadlock issues with reading the config space inside the > interrupt context, so we tweak the virtballoon_changed implementation > by moving the config read operations into the related workqueue contexts. > The config_read_bitmap is used as a flag to the workqueue callbacks > about the related config fields

Since virtio-ccw doesn't work with accessing to the config registers inside an interrupt context, this patch series avoids that issue by moving the config register accesses to the related workqueue contexts. Wei Wang (2): virtio-balloon: tweak config_changed implementation virtio-balloon: improve update_balloon_size_func drivers/virtio/virtio_balloon.c | 59

virtio-ccw has deadlock issues with reading the config space inside the interrupt context, so we tweak the virtballoon_changed implementation by moving the config read operations into the related workqueue contexts. The config_read_bitmap is used as a flag to the workqueue callbacks about the related config fields that need to be read. Reported-by: Christian Borntraeger <borntraeger at

On Thu, Jan 03, 2019 at 01:31:01PM +0800, Wei Wang wrote: > virtio-ccw has deadlock issues with reading config registers inside the > interrupt context, so we tweak the virtballoon_changed implementation > by moving the config read operations into the related workqueue contexts. > > Signed-off-by: Wei Wang <wei.w.wang at intel.com> > --- >

On Friday, January 4, 2019 11:45 PM, Michael S. Tsirkin wrote: > > struct virtio_balloon { > > struct virtio_device *vdev; > > struct virtqueue *inflate_vq, *deflate_vq, *stats_vq, *free_page_vq; > > @@ -77,6 +81,8 @@ struct virtio_balloon { > > /* Prevent updating balloon when it is being canceled. */ > > spinlock_t stop_update_lock; > > bool

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's

On Mon, Jul 13, 2020 at 08:10:14AM -0700, Alexander Duyck wrote: > On Sun, Jul 12, 2020 at 8:10 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > > > On Fri, Jul 10, 2020 at 09:13:41AM -0700, Alexander Duyck wrote: > > > On Fri, Jul 10, 2020 at 4:31 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > > > > > > > Page reporting

On Mon, Jul 13, 2020 at 08:10:14AM -0700, Alexander Duyck wrote: > On Sun, Jul 12, 2020 at 8:10 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > > > On Fri, Jul 10, 2020 at 09:13:41AM -0700, Alexander Duyck wrote: > > > On Fri, Jul 10, 2020 at 4:31 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > > > > > > > Page reporting

On Fri, Jul 10, 2020 at 09:13:41AM -0700, Alexander Duyck wrote: > On Fri, Jul 10, 2020 at 4:31 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > > > Page reporting features were never supported by legacy hypervisors. > > Supporting them poses a problem: should we use native endian-ness (like > > current code assumes)? Or little endian-ness like the virtio spec

On Fri, Jul 10, 2020 at 09:13:41AM -0700, Alexander Duyck wrote: > On Fri, Jul 10, 2020 at 4:31 AM Michael S. Tsirkin <mst at redhat.com> wrote: > > > > Page reporting features were never supported by legacy hypervisors. > > Supporting them poses a problem: should we use native endian-ness (like > > current code assumes)? Or little endian-ness like the virtio spec

virtio-ccw has deadlock issues with reading config registers inside the interrupt context, so we tweak the virtballoon_changed implementation by moving the config read operations into the related workqueue contexts. Signed-off-by: Wei Wang <wei.w.wang at intel.com> --- drivers/virtio/virtio_balloon.c | 54 ++++++++++++++++++++--------------------- 1 file changed, 26 insertions(+), 28

free cmd id is read using virtio endian, spec says all fields in balloon are LE. Fix it up. Fixes: 86a559787e6f ("virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT") Cc: stable at vger.kernel.org Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- drivers/virtio/virtio_balloon.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git

On Mon, Jun 25, 2018 at 08:05:10PM +0800, Wei Wang wrote: > Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the > support of reporting hints of guest free pages to host via virtio-balloon. > > Host requests the guest to report free page hints by sending a new cmd id > to the guest via the free_page_report_cmd_id configuration register. > > As the first

On Mon, Jun 25, 2018 at 08:05:10PM +0800, Wei Wang wrote: > Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the > support of reporting hints of guest free pages to host via virtio-balloon. > > Host requests the guest to report free page hints by sending a new cmd id > to the guest via the free_page_report_cmd_id configuration register. > > As the first

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's

This patch series is separated from the previous "Virtio-balloon Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this series enables the virtio-balloon driver to report hints of guest free pages to the host. It can be used to accelerate live migration of VMs. Here is an introduction of this usage: Live migration needs to transfer the VM's