From: Kevin Tian <[email protected]> This wraps the unsafe interrupts handling into helper as same check is also required when supporting iommufd_device_bind_pasid() later.
Signed-off-by: Kevin Tian <[email protected]> Signed-off-by: Yi Liu <[email protected]> --- drivers/iommu/iommufd/device.c | 36 ++++++++++++++++++++-------------- 1 file changed, 21 insertions(+), 15 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 6a6145b4a25e..ca3919fecc89 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -145,6 +145,25 @@ void iommufd_device_destroy(struct iommufd_object *obj) iommufd_ctx_put(idev->ictx); } +/* + * For historical compat with VFIO the insecure interrupt path is + * allowed if the module parameter is set. Insecure means that a MemWr + * operation from the device (eg a simple DMA) cannot trigger an + * interrupt outside this iommufd context. + */ +static int iommufd_allow_unsafe_interrupts(struct device *dev) +{ + if (!allow_unsafe_interrupts) + return -EPERM; + + dev_warn( + dev, + "MSI interrupts are not secure, they cannot be isolated by the platform. " + "Check that platform features like interrupt remapping are enabled. " + "Use the \"allow_unsafe_interrupts\" module parameter to override\n"); + return 0; +} + /** * iommufd_device_bind - Bind a physical device to an iommu fd * @ictx: iommufd file descriptor @@ -179,24 +198,11 @@ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, if (IS_ERR(igroup)) return ERR_CAST(igroup); - /* - * For historical compat with VFIO the insecure interrupt path is - * allowed if the module parameter is set. Secure/Isolated means that a - * MemWr operation from the device (eg a simple DMA) cannot trigger an - * interrupt outside this iommufd context. - */ if (!iommufd_selftest_is_mock_dev(dev) && !iommu_group_has_isolated_msi(igroup->group)) { - if (!allow_unsafe_interrupts) { - rc = -EPERM; + rc = iommufd_allow_unsafe_interrupts(dev); + if (rc) goto out_group_put; - } - - dev_warn( - dev, - "MSI interrupts are not secure, they cannot be isolated by the platform. " - "Check that platform features like interrupt remapping are enabled. " - "Use the \"allow_unsafe_interrupts\" module parameter to override\n"); } rc = iommu_device_claim_dma_owner(dev, ictx); -- 2.34.1
