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From: Nicolin Chen <nicolinc@nvidia.com>
To: Ben <figure1802@126.com>
Cc: <eric.auger@redhat.com>,
	linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: how test the Translation Support for SMMUv3?
Date: Wed, 27 Dec 2023 13:30:56 -0800	[thread overview]
Message-ID: <ZYyXkMWc7xvE3KkM@Asurada-Nvidia> (raw)
In-Reply-To: <61332e87.404e.18caa3d6e15.Coremail.figure1802@126.com>

On Wed, Dec 27, 2023 at 03:46:41PM +0800, Ben wrote:
> Hi Nicolin,
> I saw your pachset on Add Nested Translation Support for SMMUv3
> [LWN.net]<https://lwn.net/Articles/931502/>, i have built the
> kernel and qemu you provided in cover letter.
> I run a QEMU system as Host, and launch a VM by kvmtool. 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

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       reply	other threads:[~2023-12-27 21:31 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <61332e87.404e.18caa3d6e15.Coremail.figure1802@126.com>
2023-12-27 21:30 ` Nicolin Chen [this message]
2023-12-31 14:18   ` Re:Re: how test the Translation Support for SMMUv3? Ben
2024-01-02 19:51     ` Nicolin Chen
2024-01-03 14:09       ` Ben
2024-01-03 17:38         ` Nicolin Chen
2024-01-04 13:13           ` Ben
2024-01-04 22:35             ` Nicolin Chen
2024-01-05  1:50               ` Ben

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