- New VFIO_SET_IRQ ioctl option to pass the eventfd that is signalled when
an error occurs in the vfio_pci_device
- Register pci_error_handler for the vfio_pci driver
- When the device encounters an error, the error handler registered by
the vfio_pci driver gets invoked by the AER infrastructure
- In the error handler, signal the eventfd registered for the device.
- This results in the qemu eventfd handler getting invoked and
appropriate action taken for the guest.
Signed-off-by: Vijay Mohan Pandarathil <vijaymohan.pandarathil@xxxxxx>
---
drivers/vfio/pci/vfio_pci.c | 44 ++++++++++++++++++++++++++++++++++++-
drivers/vfio/pci/vfio_pci_intrs.c | 32 +++++++++++++++++++++++++++
drivers/vfio/pci/vfio_pci_private.h | 1 +
include/uapi/linux/vfio.h | 3 +++
4 files changed, 79 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index b28e66c..ff2a078 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -196,7 +196,9 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
return (flags & PCI_MSIX_FLAGS_QSIZE) + 1;
}
- }
+ } else if (irq_type == VFIO_PCI_ERR_IRQ_INDEX)
+ if (pci_is_pcie(vdev->pdev))
+ return 1;
return 0;
}
@@ -223,9 +225,18 @@ static long vfio_pci_ioctl(void *device_data,
if (vdev->reset_works)
info.flags |= VFIO_DEVICE_FLAGS_RESET;
+ if (pci_is_pcie(vdev->pdev)) {
+ info.flags |= VFIO_DEVICE_FLAGS_PCI_AER;
+ info.flags |= VFIO_DEVICE_FLAGS_PCI_AER_NOTIFY;
+ }
+
info.num_regions = VFIO_PCI_NUM_REGIONS;
info.num_irqs = VFIO_PCI_NUM_IRQS;
+ /* Expose only implemented IRQs */
+ if (!(info.flags & VFIO_DEVICE_FLAGS_PCI_AER_NOTIFY))
+ info.num_irqs--;
+
return copy_to_user((void __user *)arg, &info, minsz);
} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
@@ -302,6 +313,10 @@ static long vfio_pci_ioctl(void *device_data,
if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
return -EINVAL;
+ if ((info.index == VFIO_PCI_ERR_IRQ_INDEX) &&
+ !pci_is_pcie(vdev->pdev))
+ return -EINVAL;
+
info.flags = VFIO_IRQ_INFO_EVENTFD;
info.count = vfio_pci_get_irq_count(vdev, info.index);
@@ -538,11 +553,38 @@ static void vfio_pci_remove(struct pci_dev *pdev)
kfree(vdev);
}
+static pci_ers_result_t vfio_err_detected(struct pci_dev *pdev,
+ pci_channel_state_t state)
+{
+ struct vfio_pci_device *vpdev;
+ void *vdev;
+
+ vdev = vfio_device_get_from_dev(&pdev->dev);
+ if (vdev == NULL)
+ return PCI_ERS_RESULT_DISCONNECT;
+
+ vpdev = vfio_device_data(vdev);
+ if (vpdev == NULL)
+ return PCI_ERS_RESULT_DISCONNECT;
+
+ if (vpdev->err_trigger)
+ eventfd_signal(vpdev->err_trigger, 1);
+
+ vfio_device_put_vdev(vdev);
+
+ return PCI_ERS_RESULT_CAN_RECOVER;
+}
+
+static const struct pci_error_handlers vfio_err_handlers = {
+ .error_detected = vfio_err_detected,
+};
+
static struct pci_driver vfio_pci_driver = {
.name = "vfio-pci",
.id_table = NULL, /* only dynamic ids */
.probe = vfio_pci_probe,
.remove = vfio_pci_remove,
+ .err_handler = &vfio_err_handlers,
};
static void __exit vfio_pci_cleanup(void)
diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 3639371..f003e08 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -745,6 +745,31 @@ static int vfio_pci_set_msi_trigger(struct vfio_pci_device *vdev,
return 0;
}
+static int vfio_pci_set_err_eventfd(struct vfio_pci_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags, void *data)
+{
+ if ((index == VFIO_PCI_ERR_IRQ_INDEX) &&
+ (flags & VFIO_IRQ_SET_DATA_EVENTFD) &&
+ pci_is_pcie(vdev->pdev)) {
+
+ int32_t fd = *(int32_t *)data;
+
+ if (fd == -1) {
+ if (vdev->err_trigger)
+ eventfd_ctx_put(vdev->err_trigger);
+ vdev->err_trigger = NULL;
+ return 0;
+ } else if (fd >= 0) {
+ vdev->err_trigger = eventfd_ctx_fdget(fd);
+ if (IS_ERR(vdev->err_trigger))
+ return PTR_ERR(vdev->err_trigger);
+ return 0;
+ } else
+ return -EINVAL;
+ }
+ return -EINVAL;
+}
int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
unsigned index, unsigned start, unsigned count,
void *data)
@@ -779,6 +804,13 @@ int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
break;
}
break;
+ case VFIO_PCI_ERR_IRQ_INDEX:
+ switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+ case VFIO_IRQ_SET_ACTION_TRIGGER:
+ if (pci_is_pcie(vdev->pdev))
+ func = vfio_pci_set_err_eventfd;
+ break;
+ }
}
if (!func)
diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
index 611827c..daee62f 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -55,6 +55,7 @@ struct vfio_pci_device {
bool bardirty;
struct pci_saved_state *pci_saved_state;
atomic_t refcnt;
+ struct eventfd_ctx *err_trigger;
};
#define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 4758d1b..e81eb4d 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -147,6 +147,8 @@ struct vfio_device_info {
__u32 flags;
#define VFIO_DEVICE_FLAGS_RESET (1 << 0) /* Device supports reset */
#define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */
+#define VFIO_DEVICE_FLAGS_PCI_AER (1 << 2) /* AER capable */
+#define VFIO_DEVICE_FLAGS_PCI_AER_NOTIFY (1 << 3) /* Supports aer notify */
__u32 num_regions; /* Max region index + 1 */
__u32 num_irqs; /* Max IRQ index + 1 */
};
@@ -310,6 +312,7 @@ enum {
VFIO_PCI_INTX_IRQ_INDEX,
VFIO_PCI_MSI_IRQ_INDEX,
VFIO_PCI_MSIX_IRQ_INDEX,
+ VFIO_PCI_ERR_IRQ_INDEX,
VFIO_PCI_NUM_IRQS
};
--
1.7.11.3
--
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