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Subject[RFC v3 20/21] vfio-pci: Add VFIO_PCI_DMA_FAULT_IRQ_INDEX
Date
Add a new VFIO_PCI_DMA_FAULT_IRQ_INDEX index. This allows to
set/unset an eventfd that will be triggered when DMA translation
faults are detected at physical level when the nested mode is used.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
drivers/vfio/pci/vfio_pci.c | 3 +++
drivers/vfio/pci/vfio_pci_intrs.c | 19 +++++++++++++++++++
include/uapi/linux/vfio.h | 1 +
3 files changed, 23 insertions(+)

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index f9e2c8292e60..66d44736e71d 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -495,6 +495,8 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
return 1;
} else if (irq_type == VFIO_PCI_REQ_IRQ_INDEX) {
return 1;
+ } else if (irq_type == VFIO_PCI_DMA_FAULT_IRQ_INDEX) {
+ return 1;
}

return 0;
@@ -822,6 +824,7 @@ static long vfio_pci_ioctl(void *device_data,
switch (info.index) {
case VFIO_PCI_INTX_IRQ_INDEX ... VFIO_PCI_MSIX_IRQ_INDEX:
case VFIO_PCI_REQ_IRQ_INDEX:
+ case VFIO_PCI_DMA_FAULT_IRQ_INDEX:
break;
case VFIO_PCI_ERR_IRQ_INDEX:
if (pci_is_pcie(vdev->pdev))
diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 1c46045b0e7f..28a96117daf3 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -622,6 +622,18 @@ static int vfio_pci_set_req_trigger(struct vfio_pci_device *vdev,
count, flags, data);
}

+static int vfio_pci_set_dma_fault_trigger(struct vfio_pci_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags,
+ void *data)
+{
+ if (index != VFIO_PCI_DMA_FAULT_IRQ_INDEX || start != 0 || count > 1)
+ return -EINVAL;
+
+ return vfio_pci_set_ctx_trigger_single(&vdev->dma_fault_trigger,
+ count, flags, data);
+}
+
int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
unsigned index, unsigned start, unsigned count,
void *data)
@@ -671,6 +683,13 @@ int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
break;
}
break;
+ case VFIO_PCI_DMA_FAULT_IRQ_INDEX:
+ switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+ case VFIO_IRQ_SET_ACTION_TRIGGER:
+ func = vfio_pci_set_dma_fault_trigger;
+ break;
+ }
+ break;
}

if (!func)
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index b78c2c62af6d..47b65ef9d448 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -554,6 +554,7 @@ enum {
VFIO_PCI_MSIX_IRQ_INDEX,
VFIO_PCI_ERR_IRQ_INDEX,
VFIO_PCI_REQ_IRQ_INDEX,
+ VFIO_PCI_DMA_FAULT_IRQ_INDEX,
VFIO_PCI_NUM_IRQS
};

--
2.17.2
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