On Sat, Apr 24, 2021 at 7:43 AM Greg KH <greg@xxxxxxxxx> wrote: > Ok, and what prevents you from adding this new feature do your "custom" > kernel, or to use 5.12 instead? > > This is a new feature that Linux has never supported, and these patches > are not "trivial" at all. I also do not see the maintainer of the > subsystem agreeing that these are needed to be backported, which is not > a good sign. > So this is not about a new feature. This is about an existing bug that we stumbled onto while using SEV virtualization. However SEV is not needed to trigger the bug. We have reproduced the bug with just NVMe + SWIOTLB=force option in Rhel 8 environment. Please note that NVMe and SWIOTLB=force are both existing feature and without the patch they don't work together. This is why we are proposing to merge the patches into the LTS kernels. > So I recommend just using a newer kernel version, that way all will be > good and no need to backport anything. What is preventing you from > doing that today? > > thanks, > > greg k-h -- Jianxiong Gao
