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Revert "virtio_pci: harden MSI-X interrupts"

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This reverts commit 9e35276a53. Issue
were reported for the drivers that are using affinity managed IRQ
where manually toggling IRQ status is not expected. And we forget to
enable the interrupts in the restore path as well.

In the future, we will rework on the interrupt hardening.

Fixes: 9e35276a53 ("virtio_pci: harden MSI-X interrupts")
Reported-by: Marc Zyngier <maz@kernel.org>
Reported-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20220323031524.6555-2-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang
2022-03-23 11:15:24 +08:00
committed by Michael S. Tsirkin
parent 7b79edfb86
commit eb4cecb453
4 changed files with 12 additions and 32 deletions
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27
drivers/virtio/virtio_pci_common.c
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@@ -24,8 +24,8 @@ MODULE_PARM_DESC(force_legacy,
"Force legacy mode for transitional virtio 1 devices");
#endif
/* disable irq handlers */
void vp_disable_cbs(struct virtio_device *vdev)
/* wait for pending irq handlers */
void vp_synchronize_vectors(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i;
@@ -34,20 +34,7 @@ void vp_disable_cbs(struct virtio_device *vdev)
synchronize_irq(vp_dev->pci_dev->irq);
for (i = 0; i < vp_dev->msix_vectors; ++i)
disable_irq(pci_irq_vector(vp_dev->pci_dev, i));
}
/* enable irq handlers */
void vp_enable_cbs(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
int i;
if (vp_dev->intx_enabled)
return;
for (i = 0; i < vp_dev->msix_vectors; ++i)
enable_irq(pci_irq_vector(vp_dev->pci_dev, i));
synchronize_irq(pci_irq_vector(vp_dev->pci_dev, i));
}
/* the notify function used when creating a virt queue */
@@ -154,8 +141,7 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-config", name);
err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
vp_config_changed, IRQF_NO_AUTOEN,
vp_dev->msix_names[v],
vp_config_changed, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
goto error;
@@ -174,8 +160,7 @@ static int vp_request_msix_vectors(struct virtio_device *vdev, int nvectors,
snprintf(vp_dev->msix_names[v], sizeof *vp_dev->msix_names,
"%s-virtqueues", name);
err = request_irq(pci_irq_vector(vp_dev->pci_dev, v),
vp_vring_interrupt, IRQF_NO_AUTOEN,
vp_dev->msix_names[v],
vp_vring_interrupt, 0, vp_dev->msix_names[v],
vp_dev);
if (err)
goto error;
@@ -352,7 +337,7 @@ static int vp_find_vqs_msix(struct virtio_device *vdev, unsigned nvqs,
"%s-%s",
dev_name(&vp_dev->vdev.dev), names[i]);
err = request_irq(pci_irq_vector(vp_dev->pci_dev, msix_vec),
vring_interrupt, IRQF_NO_AUTOEN,
vring_interrupt, 0,
vp_dev->msix_names[msix_vec],
vqs[i]);
if (err)