Hi Alex, On 6/4/19 12:31 AM, Alex Williamson wrote: > On Sun, 26 May 2019 18:10:03 +0200 > Eric Auger <eric.auger@xxxxxxxxxx> wrote: > >> 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@xxxxxxxxxx> >> --- >> 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(+) > > > Note that I suggested to Intel folks trying to add a GVT-g page > flipping eventfd to convert to device specific interrupts the same way > we added device specific regions: > > https://patchwork.kernel.org/patch/10962337/ > > I'd probably suggest the same here so we can optionally expose it when > supported. Thanks, Agreed, I will follow the other thread. Thanks Eric > > Alex > >> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c >> index a9c8af2a774a..65a1e6814f5c 100644 >> --- a/drivers/vfio/pci/vfio_pci.c >> +++ b/drivers/vfio/pci/vfio_pci.c >> @@ -746,6 +746,8 @@ 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; >> @@ -1082,6 +1084,7 @@ 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 13e041b84d48..66b6b08c4a38 100644 >> --- a/include/uapi/linux/vfio.h >> +++ b/include/uapi/linux/vfio.h >> @@ -559,6 +559,7 @@ 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 >> }; >> >
