Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations

[PATCH v6 00/14] iommufd: Add vIOMMU infrastructure (Part-3: vEVENTQ) · Nicolin Chen <hidden> · 2025-01-25
[PATCH v6 01/14] iommufd/fault: Move two fault functions out of the header · Nicolin Chen <hidden> · 2025-01-25
Re: [PATCH v6 01/14] iommufd/fault: Move two fault functions out of the header · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-14
RE: [PATCH v6 01/14] iommufd/fault: Move two fault functions out of the header · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-18
[PATCH v6 03/14] iommufd: Abstract an iommufd_eventq from iommufd_fault · Nicolin Chen <hidden> · 2025-01-25
Re: [PATCH v6 03/14] iommufd: Abstract an iommufd_eventq from iommufd_fault · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-14
[PATCH v6 04/14] iommufd: Rename fault.c to eventq.c · Nicolin Chen <hidden> · 2025-01-25
[PATCH v6 02/14] iommufd/fault: Add an iommufd_fault_init() helper · Nicolin Chen <hidden> · 2025-01-25
[PATCH v6 07/14] iommufd/viommu: Add iommufd_viommu_report_event helper · Nicolin Chen <hidden> · 2025-01-25
RE: [PATCH v6 07/14] iommufd/viommu: Add iommufd_viommu_report_event helper · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-18
Re: [PATCH v6 07/14] iommufd/viommu: Add iommufd_viommu_report_event helper · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
RE: [PATCH v6 07/14] iommufd/viommu: Add iommufd_viommu_report_event helper · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-19
Re: [PATCH v6 07/14] iommufd/viommu: Add iommufd_viommu_report_event helper · Nicolin Chen <hidden> · 2025-02-20
RE: [PATCH v6 07/14] iommufd/viommu: Add iommufd_viommu_report_event helper · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-21
Re: [PATCH v6 07/14] iommufd/viommu: Add iommufd_viommu_report_event helper · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-21
[PATCH v6 06/14] iommufd/viommu: Add iommufd_viommu_get_vdev_id helper · Nicolin Chen <hidden> · 2025-01-25
Re: [PATCH v6 06/14] iommufd/viommu: Add iommufd_viommu_get_vdev_id helper · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
Re: [PATCH v6 06/14] iommufd/viommu: Add iommufd_viommu_get_vdev_id helper · Nicolin Chen <hidden> · 2025-02-20
Re: [PATCH v6 06/14] iommufd/viommu: Add iommufd_viommu_get_vdev_id helper · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-20
[PATCH v6 08/14] iommufd/selftest: Require vdev_id when attaching to a nested domain · Nicolin Chen <hidden> · 2025-01-25
RE: [PATCH v6 08/14] iommufd/selftest: Require vdev_id when attaching to a nested domain · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-18
[PATCH v6 05/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC · Nicolin Chen <hidden> · 2025-01-25
RE: [PATCH v6 05/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-18
Re: [PATCH v6 05/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC · Nicolin Chen <hidden> · 2025-02-18
Re: [PATCH v6 05/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
Re: [PATCH v6 05/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC · Nicolin Chen <hidden> · 2025-02-18
Re: [PATCH v6 05/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
Re: [PATCH v6 05/14] iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC · Nicolin Chen <hidden> · 2025-02-18
[PATCH v6 09/14] iommufd/selftest: Add IOMMU_TEST_OP_TRIGGER_VEVENT for vEVENTQ coverage · Nicolin Chen <hidden> · 2025-01-25
RE: [PATCH v6 09/14] iommufd/selftest: Add IOMMU_TEST_OP_TRIGGER_VEVENT for vEVENTQ coverage · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-18
[PATCH v6 10/14] iommufd/selftest: Add IOMMU_VEVENTQ_ALLOC test coverage · Nicolin Chen <hidden> · 2025-01-25
RE: [PATCH v6 10/14] iommufd/selftest: Add IOMMU_VEVENTQ_ALLOC test coverage · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-18
[PATCH v6 11/14] Documentation: userspace-api: iommufd: Update FAULT and VEVENTQ · Nicolin Chen <hidden> · 2025-01-25
Re: [PATCH v6 11/14] Documentation: userspace-api: iommufd: Update FAULT and VEVENTQ · Bagas Sanjaya <hidden> · 2025-01-28
Re: [PATCH v6 11/14] Documentation: userspace-api: iommufd: Update FAULT and VEVENTQ · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
[PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Nicolin Chen <hidden> · 2025-01-25
RE: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-18
Re: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
Re: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Nicolin Chen <hidden> · 2025-02-18
Re: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
Re: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Nicolin Chen <hidden> · 2025-02-18
Re: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
Re: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Nicolin Chen <hidden> · 2025-02-18
Re: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Nicolin Chen <hidden> · 2025-02-20
Re: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-20
Re: [PATCH v6 13/14] iommu/arm-smmu-v3: Report events that belong to devices attached to vIOMMU · Nicolin Chen <hidden> · 2025-02-21
[PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · Nicolin Chen <hidden> · 2025-01-25
RE: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · "Tian, Kevin" <kevin.tian@intel.com> · 2025-02-18
Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · Pranjal Shrivastava <praan@google.com> · 2025-02-18
Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · Nicolin Chen <hidden> · 2025-02-20
Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · Nicolin Chen <hidden> · 2025-02-18
Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · Pranjal Shrivastava <praan@google.com> · 2025-02-20
Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · Nicolin Chen <hidden> · 2025-02-18
Re: [PATCH v6 14/14] iommu/arm-smmu-v3: Set MEV bit in nested STE for DoS mitigations · Nicolin Chen <hidden> · 2025-02-20
[PATCH v6 12/14] iommu/arm-smmu-v3: Introduce struct arm_smmu_vmaster · Nicolin Chen <hidden> · 2025-01-25
Re: [PATCH v6 12/14] iommu/arm-smmu-v3: Introduce struct arm_smmu_vmaster · Jason Gunthorpe <jgg@nvidia.com> · 2025-02-18
Re: [PATCH v6 12/14] iommu/arm-smmu-v3: Introduce struct arm_smmu_vmaster · Nicolin Chen <hidden> · 2025-02-20
Re: [PATCH v6 00/14] iommufd: Add vIOMMU infrastructure (Part-3: vEVENTQ) · Nicolin Chen <hidden> · 2025-02-14

From: Jason Gunthorpe <jgg@nvidia.com>
Date: 2025-02-18 18:52:33
Also in: linux-doc, linux-iommu, linux-kselftest, linux-patches, lkml

On Tue, Feb 18, 2025 at 06:17:15PM +0000, Pranjal Shrivastava wrote:

quoted

Is MEV available only in nested mode? Otherwise it perhaps makes
sense to turn it on in all configurations in IOMMUFD paths...

I think the arm-smmu-v3's iommufd implementation only supports nested
which could be the reason.

I think starting with MEV in this limited case is reasonable.

I agree it makes sense to always turn it on from a production
perspective..

Jason

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