[PATCH v9 23/32] virtio_pci: queue_reset: support VIRTIO_F_RING_RESET
This patch implements virtio pci support for QUEUE RESET.
Performing reset on a queue is divided into these steps:
1. notify the device to reset the queue
2. recycle the buffer submitted
3. reset the vring (may re-alloc)
4. mmap vring to device, and enable the queue
This patch implements virtio_reset_vq(), virtio_enable_resetq() in the
pci scenario.
Signed-off-by: Xuan Zhuo
---
drivers/virtio/virtio_pci_common.c | 8 +--
drivers/virtio/virtio_pci_modern.c | 84 ++
drivers/virtio/virtio_ring.c | 2 +
include/linux/virtio.h | 1 +
4 files changed, 92 insertions(+), 3 deletions(-)
diff --git a/drivers/virtio/virtio_pci_common.c
b/drivers/virtio/virtio_pci_common.c
index fdbde1db5ec5..863d3a8a0956 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -248,9 +248,11 @@ static void vp_del_vq(struct virtqueue *vq)
struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
unsigned long flags;
- spin_lock_irqsave(&vp_dev->lock, flags);
- list_del(&info->node);
- spin_unlock_irqrestore(&vp_dev->lock, flags);
+ if (!vq->reset) {
+ spin_lock_irqsave(&vp_dev->lock, flags);
+ list_del(&info->node);
+ spin_unlock_irqrestore(&vp_dev->lock, flags);
+ }
vp_dev->del_vq(info);
kfree(info);
diff --git a/drivers/virtio/virtio_pci_modern.c
b/drivers/virtio/virtio_pci_modern.c
index 49a4493732cf..cb5d38f1c9c8 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -34,6 +34,9 @@ static void vp_transport_features(struct virtio_device *vdev,
u64 features)
if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&
pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV))
__virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
+
+ if (features & BIT_ULL(VIRTIO_F_RING_RESET))
+ __virtio_set_bit(vdev, VIRTIO_F_RING_RESET);
}
/* virtio config->finalize_features() implementation */
@@ -199,6 +202,83 @@ static int vp_active_vq(struct virtqueue *vq, u16 msix_vec)
return 0;
}
+static int vp_modern_reset_vq(struct virtqueue *vq)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
+ struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+ struct virtio_pci_vq_info *info;
+ unsigned long flags;
+
+ if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET))
+ return -ENOENT;
+
+ vp_modern_set_queue_reset(mdev, vq->index);
+
+ info = vp_dev->vqs[vq->index];
+
+ /* delete vq from irq handler */
+ spin_lock_irqsave(&vp_dev->lock, flags);
+ list_del(&info->node);
+ spin_unlock_irqrestore(&vp_dev->lock, flags);
+
+ INIT_LIST_HEAD(&info->node);
+
+ /* For the case where vq has an exclusive irq, to prevent the irq from
+* being received again and the pending irq, call disable_irq().
+*
+* In the scenario based on shared interrupts, vq will be searched from
+* the queue virtqueues. Since the previous list_del() has been deleted
+* from the queue, it is impossible for vq to be called in this case.
+* There is no need to close the corresponding interrupt.
+*/
+ if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR)
+ disable_irq(pci_irq_vector(vp_dev->pci_dev, info->msix_vector));
+
+ vq->reset = true;
+
+ return 0;
+}
+
+static int vp_modern_enable_reset_vq(struct virtqueue *vq)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
+ struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+ struct virtio_pci_vq_info *info;
+ unsigned long flags, index;
+ int err;
+
+ if (!vq->reset)
+ return -EBUSY;
+
+ index = vq->index;
+ info = vp_dev->vqs[index];
+
+ /* check queue reset status */
+ if (vp_modern_get_queue_reset(mdev, index) != 1)
+ return -EBUSY;
+
+ err = vp_active_vq(vq, info->msix_vector);
+ if (err)
+ return err;
+
+ if (vq->callback) {
+ spin_lock_irqsave(&vp_dev->lock, flags);
+ list_add(&info->node, &vp_dev->virtqueues);
+ spin_unlock_irqrestore(&vp_dev->lock, flags);
+ } else {
+ INIT_LIST_HEAD(&info->node);
+ }
+
+ vp_modern_set_queue_enable(&vp_dev->mdev, index, true);
+
+ if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR)
+ enable_irq(pci_irq_vector(vp_dev->pci_dev, info->msix_vector));
+
+ vq->reset = false;
+
+ return 0;
+}
+
static u16 vp_config_vector(struct virtio_pci_device *vp_dev, u16 vector)
{
return vp_modern_config_vector(&vp_dev->mdev, vector);
@@ -407,6 +487,8 @@ static const struct virtio_config_ops
virtio_pci_config_nodev_ops = {
.set_vq_affinity = vp_set_vq
Re: [PATCH v9 23/32] virtio_pci: queue_reset: support VIRTIO_F_RING_RESET
在 2022/4/6 上午11:43, Xuan Zhuo 写道:
This patch implements virtio pci support for QUEUE RESET.
Performing reset on a queue is divided into these steps:
1. notify the device to reset the queue
2. recycle the buffer submitted
3. reset the vring (may re-alloc)
4. mmap vring to device, and enable the queue
This patch implements virtio_reset_vq(), virtio_enable_resetq() in the
pci scenario.
Signed-off-by: Xuan Zhuo
---
drivers/virtio/virtio_pci_common.c | 8 +--
drivers/virtio/virtio_pci_modern.c | 84 ++
drivers/virtio/virtio_ring.c | 2 +
include/linux/virtio.h | 1 +
4 files changed, 92 insertions(+), 3 deletions(-)
diff --git a/drivers/virtio/virtio_pci_common.c
b/drivers/virtio/virtio_pci_common.c
index fdbde1db5ec5..863d3a8a0956 100644
--- a/drivers/virtio/virtio_pci_common.c
+++ b/drivers/virtio/virtio_pci_common.c
@@ -248,9 +248,11 @@ static void vp_del_vq(struct virtqueue *vq)
struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
unsigned long flags;
- spin_lock_irqsave(&vp_dev->lock, flags);
- list_del(&info->node);
- spin_unlock_irqrestore(&vp_dev->lock, flags);
+ if (!vq->reset) {
On which condition that we may hit this path?
+ spin_lock_irqsave(&vp_dev->lock, flags);
+ list_del(&info->node);
+ spin_unlock_irqrestore(&vp_dev->lock, flags);
+ }
vp_dev->del_vq(info);
kfree(info);
diff --git a/drivers/virtio/virtio_pci_modern.c
b/drivers/virtio/virtio_pci_modern.c
index 49a4493732cf..cb5d38f1c9c8 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -34,6 +34,9 @@ static void vp_transport_features(struct virtio_device *vdev,
u64 features)
if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&
pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV))
__virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
+
+ if (features & BIT_ULL(VIRTIO_F_RING_RESET))
+ __virtio_set_bit(vdev, VIRTIO_F_RING_RESET);
}
/* virtio config->finalize_features() implementation */
@@ -199,6 +202,83 @@ static int vp_active_vq(struct virtqueue *vq, u16 msix_vec)
return 0;
}
+static int vp_modern_reset_vq(struct virtqueue *vq)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
+ struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+ struct virtio_pci_vq_info *info;
+ unsigned long flags;
+
+ if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET))
+ return -ENOENT;
+
+ vp_modern_set_queue_reset(mdev, vq->index);
+
+ info = vp_dev->vqs[vq->index];
+
+ /* delete vq from irq handler */
+ spin_lock_irqsave(&vp_dev->lock, flags);
+ list_del(&info->node);
+ spin_unlock_irqrestore(&vp_dev->lock, flags);
+
+ INIT_LIST_HEAD(&info->node);
+
+ /* For the case where vq has an exclusive irq, to prevent the irq from
+* being received again and the pending irq, call disable_irq().
+*
+* In the scenario based on shared interrupts, vq will be searched from
+* the queue virtqueues. Since the previous list_del() has been deleted
+* from the queue, it is impossible for vq to be called in this case.
+* There is no need to close the corresponding interrupt.
+*/
+ if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR)
+ disable_irq(pci_irq_vector(vp_dev->pci_dev, info->msix_vector));
See the previous discussion and the revert of the first try to harden
the interrupt. We probably can't use disable_irq() since it conflicts
with the affinity managed IRQ that is used by some drivers.
We need to use synchonize_irq() and per virtqueue flag instead. As
mentioned in previous patches, this could be done on top of my rework on
the IRQ hardening .
+
+ vq->reset = true;
+
+ return 0;
+}
+
+static int vp_modern_enable_reset_vq(struct virtqueue *vq)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
+ struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
+ struct virtio_pci_vq_info *info;
+ unsigned long flags, index;
+ int err;
+
+ if (!vq->reset)
+ return -EBUSY;
+
+ index = vq->index;
+ info = vp_dev->vqs[index];
+
+ /* check queue reset status */
+ if (vp_modern_get_queue_reset(mdev, index) != 1)
+ return -EBUSY;
+
+ err = vp_active_vq(vq, info->msix_vector);
+ if (err)
+ return err;
+
+ if (vq->callback) {
+ spin_lock_irqsave(&vp_dev->lock, flags);
+ list_add(&info->node, &vp_dev->virtqueues);
+ spin_unlock_irqrestore(&vp_dev->lock, flags);
+ } else {
+ INIT_LIST_HEAD(&info->node);
+ }
+
+ vp_modern_set_queue_enable(&vp_dev->mdev, index, true);
+
+ if (
Re: [PATCH v9 23/32] virtio_pci: queue_reset: support VIRTIO_F_RING_RESET
On Tue, 12 Apr 2022 15:07:58 +0800, Jason Wang wrote:
>
> 在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> > This patch implements virtio pci support for QUEUE RESET.
> >
> > Performing reset on a queue is divided into these steps:
> >
> > 1. notify the device to reset the queue
> > 2. recycle the buffer submitted
> > 3. reset the vring (may re-alloc)
> > 4. mmap vring to device, and enable the queue
> >
> > This patch implements virtio_reset_vq(), virtio_enable_resetq() in the
> > pci scenario.
> >
> > Signed-off-by: Xuan Zhuo
> > ---
> > drivers/virtio/virtio_pci_common.c | 8 +--
> > drivers/virtio/virtio_pci_modern.c | 84 ++
> > drivers/virtio/virtio_ring.c | 2 +
> > include/linux/virtio.h | 1 +
> > 4 files changed, 92 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/virtio/virtio_pci_common.c
> > b/drivers/virtio/virtio_pci_common.c
> > index fdbde1db5ec5..863d3a8a0956 100644
> > --- a/drivers/virtio/virtio_pci_common.c
> > +++ b/drivers/virtio/virtio_pci_common.c
> > @@ -248,9 +248,11 @@ static void vp_del_vq(struct virtqueue *vq)
> > struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
> > unsigned long flags;
> >
> > - spin_lock_irqsave(&vp_dev->lock, flags);
> > - list_del(&info->node);
> > - spin_unlock_irqrestore(&vp_dev->lock, flags);
> > + if (!vq->reset) {
>
>
> On which condition that we may hit this path?
>
>
> > + spin_lock_irqsave(&vp_dev->lock, flags);
> > + list_del(&info->node);
> > + spin_unlock_irqrestore(&vp_dev->lock, flags);
> > + }
> >
> > vp_dev->del_vq(info);
> > kfree(info);
> > diff --git a/drivers/virtio/virtio_pci_modern.c
> > b/drivers/virtio/virtio_pci_modern.c
> > index 49a4493732cf..cb5d38f1c9c8 100644
> > --- a/drivers/virtio/virtio_pci_modern.c
> > +++ b/drivers/virtio/virtio_pci_modern.c
> > @@ -34,6 +34,9 @@ static void vp_transport_features(struct virtio_device
> > *vdev, u64 features)
> > if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&
> > pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV))
> > __virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
> > +
> > + if (features & BIT_ULL(VIRTIO_F_RING_RESET))
> > + __virtio_set_bit(vdev, VIRTIO_F_RING_RESET);
> > }
> >
> > /* virtio config->finalize_features() implementation */
> > @@ -199,6 +202,83 @@ static int vp_active_vq(struct virtqueue *vq, u16
> > msix_vec)
> > return 0;
> > }
> >
> > +static int vp_modern_reset_vq(struct virtqueue *vq)
> > +{
> > + struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
> > + struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
> > + struct virtio_pci_vq_info *info;
> > + unsigned long flags;
> > +
> > + if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET))
> > + return -ENOENT;
> > +
> > + vp_modern_set_queue_reset(mdev, vq->index);
> > +
> > + info = vp_dev->vqs[vq->index];
> > +
> > + /* delete vq from irq handler */
> > + spin_lock_irqsave(&vp_dev->lock, flags);
> > + list_del(&info->node);
> > + spin_unlock_irqrestore(&vp_dev->lock, flags);
> > +
> > + INIT_LIST_HEAD(&info->node);
> > +
> > + /* For the case where vq has an exclusive irq, to prevent the irq from
> > +* being received again and the pending irq, call disable_irq().
> > +*
> > +* In the scenario based on shared interrupts, vq will be searched from
> > +* the queue virtqueues. Since the previous list_del() has been deleted
> > +* from the queue, it is impossible for vq to be called in this case.
> > +* There is no need to close the corresponding interrupt.
> > +*/
> > + if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR)
> > + disable_irq(pci_irq_vector(vp_dev->pci_dev, info->msix_vector));
>
>
> See the previous discussion and the revert of the first try to harden
> the interrupt. We probably can't use disable_irq() since it conflicts
> with the affinity managed IRQ that is used by some drivers.
>
> We need to use synchonize_irq() and per virtqueue flag instead. As
> mentioned in previous patches, this could be done on top of my rework on
> the IRQ hardening .
OK, the next version will contain hardened features by per virtqueue flag.
Thanks.
>
>
> > +
> > + vq->reset = true;
> > +
> > + return 0;
> > +}
> > +
> > +static int vp_modern_enable_reset_vq(struct virtqueue *vq)
> > +{
> > + struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
> > + struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
> > + struct virtio_pci_vq_info *info;
> > + unsigned long flags, index;
> > + int err;
> > +
> > + if (!vq->reset)
> > + return -EBUSY;
> > +
> > + index = vq->index;
> > + info = vp_dev->vqs[index];
> > +
> > + /* check queue reset status */
> > + if (vp_modern_get_queue_reset(mdev, index) != 1)
> > + return -EBUSY;
> > +
> > + err = vp_active_vq(vq, info->msix_vector);
> > + if (err)
Re: [PATCH v9 23/32] virtio_pci: queue_reset: support VIRTIO_F_RING_RESET
On Tue, 12 Apr 2022 15:07:58 +0800, Jason Wang wrote:
>
> 在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> > This patch implements virtio pci support for QUEUE RESET.
> >
> > Performing reset on a queue is divided into these steps:
> >
> > 1. notify the device to reset the queue
> > 2. recycle the buffer submitted
> > 3. reset the vring (may re-alloc)
> > 4. mmap vring to device, and enable the queue
> >
> > This patch implements virtio_reset_vq(), virtio_enable_resetq() in the
> > pci scenario.
> >
> > Signed-off-by: Xuan Zhuo
> > ---
> > drivers/virtio/virtio_pci_common.c | 8 +--
> > drivers/virtio/virtio_pci_modern.c | 84 ++
> > drivers/virtio/virtio_ring.c | 2 +
> > include/linux/virtio.h | 1 +
> > 4 files changed, 92 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/virtio/virtio_pci_common.c
> > b/drivers/virtio/virtio_pci_common.c
> > index fdbde1db5ec5..863d3a8a0956 100644
> > --- a/drivers/virtio/virtio_pci_common.c
> > +++ b/drivers/virtio/virtio_pci_common.c
> > @@ -248,9 +248,11 @@ static void vp_del_vq(struct virtqueue *vq)
> > struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
> > unsigned long flags;
> >
> > - spin_lock_irqsave(&vp_dev->lock, flags);
> > - list_del(&info->node);
> > - spin_unlock_irqrestore(&vp_dev->lock, flags);
> > + if (!vq->reset) {
>
>
> On which condition that we may hit this path?
As discussed in patch 31, it may fail when renable vq.
Thanks.
>
>
> > + spin_lock_irqsave(&vp_dev->lock, flags);
> > + list_del(&info->node);
> > + spin_unlock_irqrestore(&vp_dev->lock, flags);
> > + }
> >
> > vp_dev->del_vq(info);
> > kfree(info);
> > diff --git a/drivers/virtio/virtio_pci_modern.c
> > b/drivers/virtio/virtio_pci_modern.c
> > index 49a4493732cf..cb5d38f1c9c8 100644
> > --- a/drivers/virtio/virtio_pci_modern.c
> > +++ b/drivers/virtio/virtio_pci_modern.c
> > @@ -34,6 +34,9 @@ static void vp_transport_features(struct virtio_device
> > *vdev, u64 features)
> > if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&
> > pci_find_ext_capability(pci_dev, PCI_EXT_CAP_ID_SRIOV))
> > __virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
> > +
> > + if (features & BIT_ULL(VIRTIO_F_RING_RESET))
> > + __virtio_set_bit(vdev, VIRTIO_F_RING_RESET);
> > }
> >
> > /* virtio config->finalize_features() implementation */
> > @@ -199,6 +202,83 @@ static int vp_active_vq(struct virtqueue *vq, u16
> > msix_vec)
> > return 0;
> > }
> >
> > +static int vp_modern_reset_vq(struct virtqueue *vq)
> > +{
> > + struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
> > + struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
> > + struct virtio_pci_vq_info *info;
> > + unsigned long flags;
> > +
> > + if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET))
> > + return -ENOENT;
> > +
> > + vp_modern_set_queue_reset(mdev, vq->index);
> > +
> > + info = vp_dev->vqs[vq->index];
> > +
> > + /* delete vq from irq handler */
> > + spin_lock_irqsave(&vp_dev->lock, flags);
> > + list_del(&info->node);
> > + spin_unlock_irqrestore(&vp_dev->lock, flags);
> > +
> > + INIT_LIST_HEAD(&info->node);
> > +
> > + /* For the case where vq has an exclusive irq, to prevent the irq from
> > +* being received again and the pending irq, call disable_irq().
> > +*
> > +* In the scenario based on shared interrupts, vq will be searched from
> > +* the queue virtqueues. Since the previous list_del() has been deleted
> > +* from the queue, it is impossible for vq to be called in this case.
> > +* There is no need to close the corresponding interrupt.
> > +*/
> > + if (vp_dev->per_vq_vectors && info->msix_vector != VIRTIO_MSI_NO_VECTOR)
> > + disable_irq(pci_irq_vector(vp_dev->pci_dev, info->msix_vector));
>
>
> See the previous discussion and the revert of the first try to harden
> the interrupt. We probably can't use disable_irq() since it conflicts
> with the affinity managed IRQ that is used by some drivers.
>
> We need to use synchonize_irq() and per virtqueue flag instead. As
> mentioned in previous patches, this could be done on top of my rework on
> the IRQ hardening .
>
>
> > +
> > + vq->reset = true;
> > +
> > + return 0;
> > +}
> > +
> > +static int vp_modern_enable_reset_vq(struct virtqueue *vq)
> > +{
> > + struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
> > + struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
> > + struct virtio_pci_vq_info *info;
> > + unsigned long flags, index;
> > + int err;
> > +
> > + if (!vq->reset)
> > + return -EBUSY;
> > +
> > + index = vq->index;
> > + info = vp_dev->vqs[index];
> > +
> > + /* check queue reset status */
> > + if (vp_modern_get_queue_reset(mdev, index) != 1)
> > + return -EBUSY;
> > +
> > + err = vp_active_vq(vq, info->msix_vector);
> > + if (err)
> > + ret
Re: [PATCH v9 23/32] virtio_pci: queue_reset: support VIRTIO_F_RING_RESET
On Wed, Apr 13, 2022 at 11:23 AM Xuan Zhuo wrote:
>
> On Tue, 12 Apr 2022 15:07:58 +0800, Jason Wang wrote:
> >
> > 在 2022/4/6 上午11:43, Xuan Zhuo 写道:
> > > This patch implements virtio pci support for QUEUE RESET.
> > >
> > > Performing reset on a queue is divided into these steps:
> > >
> > > 1. notify the device to reset the queue
> > > 2. recycle the buffer submitted
> > > 3. reset the vring (may re-alloc)
> > > 4. mmap vring to device, and enable the queue
> > >
> > > This patch implements virtio_reset_vq(), virtio_enable_resetq() in the
> > > pci scenario.
> > >
> > > Signed-off-by: Xuan Zhuo
> > > ---
> > > drivers/virtio/virtio_pci_common.c | 8 +--
> > > drivers/virtio/virtio_pci_modern.c | 84 ++
> > > drivers/virtio/virtio_ring.c | 2 +
> > > include/linux/virtio.h | 1 +
> > > 4 files changed, 92 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/virtio/virtio_pci_common.c
> > > b/drivers/virtio/virtio_pci_common.c
> > > index fdbde1db5ec5..863d3a8a0956 100644
> > > --- a/drivers/virtio/virtio_pci_common.c
> > > +++ b/drivers/virtio/virtio_pci_common.c
> > > @@ -248,9 +248,11 @@ static void vp_del_vq(struct virtqueue *vq)
> > > struct virtio_pci_vq_info *info = vp_dev->vqs[vq->index];
> > > unsigned long flags;
> > >
> > > - spin_lock_irqsave(&vp_dev->lock, flags);
> > > - list_del(&info->node);
> > > - spin_unlock_irqrestore(&vp_dev->lock, flags);
> > > + if (!vq->reset) {
> >
> >
> > On which condition that we may hit this path?
> >
> >
> > > + spin_lock_irqsave(&vp_dev->lock, flags);
> > > + list_del(&info->node);
> > > + spin_unlock_irqrestore(&vp_dev->lock, flags);
> > > + }
> > >
> > > vp_dev->del_vq(info);
> > > kfree(info);
> > > diff --git a/drivers/virtio/virtio_pci_modern.c
> > > b/drivers/virtio/virtio_pci_modern.c
> > > index 49a4493732cf..cb5d38f1c9c8 100644
> > > --- a/drivers/virtio/virtio_pci_modern.c
> > > +++ b/drivers/virtio/virtio_pci_modern.c
> > > @@ -34,6 +34,9 @@ static void vp_transport_features(struct virtio_device
> > > *vdev, u64 features)
> > > if ((features & BIT_ULL(VIRTIO_F_SR_IOV)) &&
> > > pci_find_ext_capability(pci_dev,
> > > PCI_EXT_CAP_ID_SRIOV))
> > > __virtio_set_bit(vdev, VIRTIO_F_SR_IOV);
> > > +
> > > + if (features & BIT_ULL(VIRTIO_F_RING_RESET))
> > > + __virtio_set_bit(vdev, VIRTIO_F_RING_RESET);
> > > }
> > >
> > > /* virtio config->finalize_features() implementation */
> > > @@ -199,6 +202,83 @@ static int vp_active_vq(struct virtqueue *vq, u16
> > > msix_vec)
> > > return 0;
> > > }
> > >
> > > +static int vp_modern_reset_vq(struct virtqueue *vq)
> > > +{
> > > + struct virtio_pci_device *vp_dev = to_vp_device(vq->vdev);
> > > + struct virtio_pci_modern_device *mdev = &vp_dev->mdev;
> > > + struct virtio_pci_vq_info *info;
> > > + unsigned long flags;
> > > +
> > > + if (!virtio_has_feature(vq->vdev, VIRTIO_F_RING_RESET))
> > > + return -ENOENT;
> > > +
> > > + vp_modern_set_queue_reset(mdev, vq->index);
> > > +
> > > + info = vp_dev->vqs[vq->index];
> > > +
> > > + /* delete vq from irq handler */
> > > + spin_lock_irqsave(&vp_dev->lock, flags);
> > > + list_del(&info->node);
> > > + spin_unlock_irqrestore(&vp_dev->lock, flags);
> > > +
> > > + INIT_LIST_HEAD(&info->node);
> > > +
> > > + /* For the case where vq has an exclusive irq, to prevent the irq from
> > > +* being received again and the pending irq, call disable_irq().
> > > +*
> > > +* In the scenario based on shared interrupts, vq will be searched
> > > from
> > > +* the queue virtqueues. Since the previous list_del() has been
> > > deleted
> > > +* from the queue, it is impossible for vq to be called in this case.
> > > +* There is no need to close the corresponding interrupt.
> > > +*/
> > > + if (vp_dev->per_vq_vectors && info->msix_vector !=
> > > VIRTIO_MSI_NO_VECTOR)
> > > + disable_irq(pci_irq_vector(vp_dev->pci_dev,
> > > info->msix_vector));
> >
> >
> > See the previous discussion and the revert of the first try to harden
> > the interrupt. We probably can't use disable_irq() since it conflicts
> > with the affinity managed IRQ that is used by some drivers.
> >
> > We need to use synchonize_irq() and per virtqueue flag instead. As
> > mentioned in previous patches, this could be done on top of my rework on
> > the IRQ hardening .
>
> OK, the next version will contain hardened features by per virtqueue flag.
Actually, I'm working on a new version of hardening. I plan to switch
to the virtqueue flag so we will be fine here if we do the resize work
on top.
I will cc you in the new version.
Thanks
>
> Thanks.
>
> >
> >
> > > +
> > > + vq->reset = true;
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int vp_modern_enable_reset_vq(struct virtqueue *vq)
> > > +{
> > > + struct virtio_pci_devi
