On Tue, May 18, 2021 at 10:18:09PM +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. I still fail to understand why you can not just use the 5.10.y kernel or newer. What is preventing you from doing this if you wish to use this type of hardware? This is not a "regression" in that the 5.4.y kernel has never worked with this hardware before, it feels like a new feature. Please, just use 5.10.y or newer, your life will be so much easier in the longrun. thanks, greg k-h
