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