[PATCH AUTOSEL 6.6 060/294] vfio/pci: Handle INTx IRQ_NOTCONNECTED

Sasha Levin
2025-05-05T22:58:31Z

From: Alex Williamson <alex.williamson@redhat.com>

[ Upstream commit 860be250fc32de9cb24154bf21b4e36f40925707 ]

Some systems report INTx as not routed by setting pdev->irq to
IRQ_NOTCONNECTED, resulting in a -ENOTCONN error when trying to
setup eventfd signaling. Include this in the set of conditions
for which the PIN register is virtualized to zero.

Additionally consolidate vfio_pci_get_irq_count() to use this
virtualized value in reporting INTx support via ioctl and sanity
checking ioctl paths since pdev->irq is re-used when the device
is in MSI mode.

The combination of these results in both the config space of the
device and the ioctl interface behaving as if the device does not
support INTx.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20250311230623.1264283-1-alex.williamson@redhat.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/vfio/pci/vfio_pci_config.c | 3 ++-
drivers/vfio/pci/vfio_pci_core.c | 10 +---------
drivers/vfio/pci/vfio_pci_intrs.c | 2 +-
3 files changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index a2ad4f7c716bf..d9eb8733a324b 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -1813,7 +1813,8 @@ int vfio_config_init(struct vfio_pci_core_device *vdev)
cpu_to_le16(PCI_COMMAND_MEMORY);
}

- if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) || vdev->nointx)
+ if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) || vdev->nointx ||
+ vdev->pdev->irq == IRQ_NOTCONNECTED)
vconfig[PCI_INTERRUPT_PIN] = 0;

ret = vfio_cap_init(vdev);
diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
index a8f259bc2f4d0..fa168b4342395 100644
--- a/drivers/vfio/pci/vfio_pci_core.c
+++ b/drivers/vfio/pci/vfio_pci_core.c
@@ -731,15 +731,7 @@ EXPORT_SYMBOL_GPL(vfio_pci_core_finish_enable);
static int vfio_pci_get_irq_count(struct vfio_pci_core_device *vdev, int irq_type)
{
if (irq_type == VFIO_PCI_INTX_IRQ_INDEX) {
- u8 pin;
-
- if (!IS_ENABLED(CONFIG_VFIO_PCI_INTX) ||
- vdev->nointx || vdev->pdev->is_virtfn)
- return 0;
-
- pci_read_config_byte(vdev->pdev, PCI_INTERRUPT_PIN, &pin);
-
- return pin ? 1 : 0;
+ return vdev->vconfig[PCI_INTERRUPT_PIN] ? 1 : 0;
} else if (irq_type == VFIO_PCI_MSI_IRQ_INDEX) {
u8 pos;
u16 flags;
diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 620134041b488..c4322faca2bd5 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -269,7 +269,7 @@ static int vfio_intx_enable(struct vfio_pci_core_device *vdev,
if (!is_irq_none(vdev))
return -EINVAL;

- if (!pdev->irq)
+ if (!pdev->irq || pdev->irq == IRQ_NOTCONNECTED)
return -ENODEV;

name = kasprintf(GFP_KERNEL_ACCOUNT, "vfio-intx(%s)", pci_name(pdev));
--
2.39.5