Re: [PATCH v3 0/7] arm64: add system vulnerability sysfs entries

[Jeremy Linton]

Hi,

On 01/15/2019 01:50 PM, Stefan Wahren wrote:
> Hi Jeremy,
>
> > Jeremy Linton <jeremy.linton@xxxxxxx> hat am 10. Januar 2019 um 00:55 geschrieben:
> >
> >
> > Arm64 machines should be displaying a human readable
> > vulnerability status to speculative execution attacks in
> > /sys/devices/system/cpu/vulnerabilities
> >
> > This series enables that behavior by providing the expected
> > functions. Those functions expose the cpu errata and feature
> > states, as well as whether firmware is responding appropriately
> > to display the overall machine status. This means that in a
> > heterogeneous machine we will only claim the machine is mitigated
> > or safe if we are confident all booted cores are safe or
> > mitigated.
>
> i applied this v3 series and Marc's v2 series.
>
> Now i'm getting the following on a Raspberry Pi 3 B+ :
>
> meltdown:Not affected
> spec_store_bypass:Not affected
> spectre_v1:Mitigation: __user pointer sanitization
>
> So the entries l1tf and spectre_v2 disappeared.

Yes, the l1tf entry should be gone.

I believe there is a problem with the "1/2 advertise.." patch in that 
the 'arm64_requested_vuln_attrs |=' line needs to be hoisted  to the top 
of check_branch_predictor() and the '__spectrev2_safe = false' line 
needs to be hoisted 6 lines immediately above "/* Fallback to firmware 
detection*/"

That should re-enable the spectre_v2 entry.