On Thu, Apr 29, 2021 at 05:33:06PM +0000, Jianxiong Gao wrote: > We observed several NVMe failures when running with SWIOTLB. The root > cause of the issue is that when data is mapped via SWIOTLB, the address > offset is not preserved. Several device drivers including the NVMe > driver relies on this offset to function correctly. > > Even though we discovered the error when running using AMD SEV, we have > reproduced the same error in Rhel 8 without SEV. By adding swiotlb=force > option to the boot command line parameter, NVMe funcionality is > impacted. For example formatting a disk into xfs format returns an > error. > > > ---- > Changes in v2: > Rebased patches to 5.10.33 It looks like if I were to take these now, we need to also have a version for 5.11.y because you can not upgrade from an older kernel and have a "regression" like this, right? 5.11.y will still be alive for at least a week or so, let me see if your backports work there or not... thanks, greg k-h
