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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Feb 13, 2024 at 03:37:43PM +0000, Mostafa Saleh wrote: > Hi Jason, > > On Tue, Feb 06, 2024 at 11:12:40AM -0400, Jason Gunthorpe wrote: > > Logically arm_smmu_init_strtab() is the function that allocates and > > populates the stream table with the initial value of the STEs. After this > > function returns the stream table should be fully ready. > > > > arm_smmu_rmr_install_bypass_ste() adjusts the initial stream table to force > > any SIDs that the FW says have IOMMU_RESV_DIRECT to use bypass. This > > ensures there is no disruption to the identity mapping during boot. > > > > Put arm_smmu_rmr_install_bypass_ste() into arm_smmu_init_strtab(), it > > already executes immediately after arm_smmu_init_strtab(). > > > > No functional change intended. > > I think arm_smmu_init_strtab is quite low level to abstract FW configuration in it. > For example in KVM[1] we'd re-use a big part of this driver and rely on similar > low-level functions. But no strong opinion. I'm happy to drop this patch, if no strong opinion I will leave it > [1] https://lore.kernel.org/kvmarm/20230201125328.2186498-1-jean-philippe@linaro.org/ I saw this but I didn't try to figure out too much what it is doing.. It looks like a new iommu driver that re-uses alot of the datastructures of SMMU but has a different HW facing API based on hypercalls? It seems interesting, but my knee jerk reaction would be that a new iommu driver proposal needs to implement the new iommu core APIs, not the old stuff. IMHO, when this progresses past a RFC it needs to come as a proper submission of just the iommu driver, in the normal way. I also wonder about the wisdom of sharing so much code. Code sharing is not unconditionally good if it doesn't have a robust abstraction.. Jason _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel