On Wed, May 05, 2021 at 09:23:28AM +0200, Greg KH wrote: > 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... Ok, looks like it worked, now queued up. greg k-h
