Re: Missing sriov_numvfs after removal of EfiMemoryMappedIO from E820 map

[Peifeng Qiu <linux@qiupf.dev>]

On Mon, Jan 16, 2023 at 12:41 AM Linux kernel regression tracking
(Thorsten Leemhuis) <regressions@leemhuis.info> wrote:
>
> Forget to mention one small detail:
>
> On 15.01.23 15:21, Linux kernel regression tracking (Thorsten Leemhuis)
> wrote:
> > [CCing the regression list, as it should be in the loop for regressions:
> > https://docs.kernel.org/admin-guide/reporting-regressions.html]
> >
> > Hi, this is your Linux kernel regression tracker.
> >
> > On 15.01.23 10:21, Peifeng Qiu wrote:
> >>
> >> I'm using a dual Xeon system with Intel e810 25G network card and make use
> >> of SRIOV feature heavily. I have a script to setup the NIC the first step is
> >> echo $VFS > /sys/class/net/$DEVNAME/device/sriov_numvfs
> >>
> >> After switching from v6.1 to v6.2-rc1 "sriov_numvfs" is no longer present. If I
> >> switch back to v6.1 it's back. Command line parameters are the same so it's
> >> most likely kernel changes. I did git bisect and found the culprit to be
> >> 07eab0901ed(efi/x86: Remove EfiMemoryMappedIO from E820 map)
> >
> > This is not my area of expertise, but there is another report about an
> > issue that was bisected to that particular commit:
> >
> > https://lore.kernel.org/lkml/ac2693d8-8ba3-72e0-5b66-b3ae008d539d@linux.intel.com/
> >
> > A fix for that one was posted here:
> >
> > https://lore.kernel.org/lkml/20230110180243.1590045-1-helgaas@kernel.org/
> >
> > You might want to look into the report and if it looks like a possible
> > duplicate give the proposed fix a try.
>
> FWIW, that patch was recently mainlined and thus will be in 6.2-rc4 that
> Linus will likely release in a few hours.
>
> Ciao, Thorsten

I just tested the latest v6.2-rc4 and I can confirm that the issue is
fixed. Thanks!

Best regards,
Peifeng Qiu