Re: [PATCH 5.10 00/10] KVM CR0.WP series backport

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On Mon, May 08, 2023, Mathias Krause wrote:
> This is a backport of the CR0.WP KVM series[1] to Linux v5.10. It
> further extends the v5.15 backport by two patches, namely patch 5 (which
> is the prerequisite for Lai's patches) and patch 8 which was already
> part of the v5.15.27 stable update but didn't made it to v5.10.
> 
> I used 'ssdd 10 50000' from rt-tests[2] as a micro-benchmark, running on
> a grsecurity L1 VM. Below table shows the results (runtime in seconds,
> lower is better):
> 
>                           legacy     TDP    shadow
>     Linux v5.10.177       10.37s    88.7s    69.7s
>     + patches              4.88s     4.92s   70.1s
> 
> TDP MMU is, as for v5.15, slower than shadow paging on a vanilla kernel.
> Fortunately it's disabled by default.
> 
> The KVM unit test suite showed no regressions.
> 
> Please consider applying.

NAK, same reasoning as the 5.15 backports.

https://lore.kernel.org/all/ZF1a8xIGLwcdJDVZ@xxxxxxxxxx



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