On Sat, Oct 08, 2022 at 05:50:31PM +0800, chenxiang wrote: > From: Xiang Chen <chenxiang66@xxxxxxxxxxxxx> > > We find a issue on ARM64 platform with HNS3 VF SRIOV enabled (VFIO > passthrough in qemu): > kill the qemu thread, then echo 0 > sriov_numvfs to disable sriov > immediately, sometimes we will see following warnings: I suspect this is fixed in vfio-next now, in a different way. Please check > After removing container_q, arm_smmu_release_dev() caused by disabling > sriov may occur before arm_smmuv3_attach_dev() called by echo 0 > sriov_numvfs, > and arm_smmu_attach_dev() may refer to freed iommu_fwspec, so it causes > above warnings. Which is the same effective issue s390 hit already. It is interesting that container_q was solving this, that seems to be a inadverent side effect nobody noticed. Jason
