4 May
2021
4 May
'21
8:22 p.m.
On Thu, Apr 29, 2021 at 10:34 AM Jianxiong Gao jxgao@google.com 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.
Christoph, are you OK with backporting this patch set to LTS, based on the rationale in the cover letter above? Thanks, Marc