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Wed, 27 Dec 2023 13:30:58 -0800 Date: Wed, 27 Dec 2023 13:30:56 -0800 From: Nicolin Chen To: Ben CC: , linux-arm-kernel Subject: Re: how test the Translation Support for SMMUv3? 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But i > cannot find a IOMMU on VM, how do you test your patchset? Make sure you build the kernel with CONFIG_IOMMUFD, and QEMU likely. > would you like provide your steps? # A set of sample commands echo 0002:01:00.0 | tee /sys/bus/pci/devices/0002\:01\:00.0/driver/unbind; dmesg | tail echo 8086 0111 | tee /sys/bus/pci/drivers/vfio-pci/new_id qemu-1214 -object iommufd,id=iommufd0 \ -machine virt,accel=kvm,gic-version=3,iommu=nested-smmuv3,iommufd=iommufd0 \ -cpu host -m 256m -nographic -kernel /root/Image -bios /root/AAVMF_CODE.fd \ -initrd /root/buildroot-20200422-aarch64-qemu-test-rootfs.cpio \ -object memory-backend-ram,size=256m,id=m0 -numa node,cpus=0,nodeid=0,memdev=m0 \ -device vfio-pci,host=0002:01:00.0,rombar=0,iommufd=iommufd0,id="test0" > BTW, i add a printk on arm_smmu_device_hw_probe() to print out the smmu->features , it looks your QEMU still only support ARM_SMMU_FEAT_TRANS_S1. QEMU is used by the guest that should only support S1. The host kernel on the hand should support both S1 and S2 for nesting. > Does it provide a vIOMMU of SMMUv3 for your kernel and qemu patchset? Once you boot with "iommu=nested-smmuv3", there should be one. Nicolin _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel