- 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.pandarat...@hp.com> --- 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