Re: [Xen-devel] [PATCH 0/3] x86: S3 resume adjustments

[Simon Gaiser <simon@xxxxxxxxxxxxxxxxxxxxxx>]

Jan Beulich:
> 1: correct ordering of operations during S3 resume
> 2: suppress BTI mitigations around S3 suspend/resume
> 3: check feature flags after resume
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> Simon, could you give this a try please?

Backported to 4.8 it works fine with the two fixes I sent earlier.

I now also tried staging. Resume is broken even without IBRS/IBPB. It
panics about a double fault somewhere after it starts to enable the
non-boot CPUs. Since the IBRS/IPBP problem happens before that point I
could test the patches anyway. With them it gets again to the point
where it double faults. So the patches are most likely fine.

I didn't really looked yet at the cause of the double fault.

Simon

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