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Sun, 26 Jul 2026 09:23:07 -0700 (PDT) Received: from jgg by jggl with local (Exim 4.95) (envelope-from ) id 1wo1d5-0001Tl-8m; Sun, 26 Jul 2026 13:23:07 -0300 Date: Sun, 26 Jul 2026 13:23:07 -0300 From: Jason Gunthorpe To: Ashish Mhetre Cc: catalin.marinas@arm.com, will@kernel.org, corbet@lwn.net, skhan@linuxfoundation.org, robin.murphy@arm.com, joro@8bytes.org, nicolinc@nvidia.com, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, iommu@lists.linux.dev, linux-tegra@vger.kernel.org Subject: Re: [PATCH v9 3/4] iommu/arm-smmu-v3-iommufd: Report CFGI/TLBI-repeat erratum Message-ID: References: <20260726081904.1408859-1-amhetre@nvidia.com> <20260726081904.1408859-4-amhetre@nvidia.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260726081904.1408859-4-amhetre@nvidia.com> On Sun, Jul 26, 2026 at 08:19:03AM +0000, Ashish Mhetre wrote: > A guest with access to VCMDQ generates its own invalidation commands > and must apply any invalidation errata before submitting them. If the > host also repeats those commands, each affected invalidation is issued > four times instead of twice. > > Add IOMMU_HW_INFO_ARM_SMMUV3_ERRATA_REPEAT_TLBI_CFGI to report the > CFGI/TLBI-repeat erratum to user space. This allows the VMM to expose > the erratum to the guest or apply the workaround itself. > > Use the raw __arm_smmu_cmdq_issue_cmdlist() helper for user-provided > invalidations so the host does not apply the workaround a second time. > Add arm_smmu_erratum_repeat_tlbi_cfgi() to query the static key when > populating the SMMUv3 hardware information. > > Signed-off-by: Ashish Mhetre > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 7 +++++-- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 7 ++++++- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 + > include/uapi/linux/iommufd.h | 13 ++++++++++++- > 4 files changed, 24 insertions(+), 4 deletions(-) Reviewed-by: Jason Gunthorpe Jason