From d525a5b8cf39791b47a3d61b36dcb43e1d6fbde8 Mon Sep 17 00:00:00 2001 From: Jason Gunthorpe Date: Mon, 17 Jul 2023 15:11:57 -0300 Subject: iommufd: Move isolated msi enforcement to iommufd_device_bind() With the recent rework this no longer needs to be done at domain attachment time, we know if the device is usable by iommufd when we bind it. The value of msi_device_has_isolated_msi() is not allowed to change while a driver is bound. Link: https://lore.kernel.org/r/1-v8-6659224517ea+532-iommufd_alloc_jgg@nvidia.com Reviewed-by: Kevin Tian Reviewed-by: Lu Baolu Tested-by: Nicolin Chen Signed-off-by: Jason Gunthorpe --- drivers/iommu/iommufd/device.c | 38 ++++++++++++++++++++------------------ 1 file changed, 20 insertions(+), 18 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 59fec5783eb9..d4cc39426309 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -60,6 +60,26 @@ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx, if (!group) return ERR_PTR(-ENODEV); + /* + * 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(group)) { + if (!allow_unsafe_interrupts) { + rc = -EPERM; + 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); if (rc) goto out_group_put; @@ -188,24 +208,6 @@ static int iommufd_device_setup_msi(struct iommufd_device *idev, */ hwpt->msi_cookie = true; } - - /* - * 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. - */ - if (!iommufd_selftest_is_mock_dev(idev->dev) && - !iommu_group_has_isolated_msi(idev->group)) { - if (!allow_unsafe_interrupts) - return -EPERM; - - dev_warn( - idev->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; } -- cgit v1.2.3