Re: [PATCH 5.4 0/3] KVM CR0.WP series backport

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On Mon, May 08, 2023, Mathias Krause wrote:
> This is a partial backport of the CR0.WP KVM series[1] to Linux v5.4. It
> limits itself to avoid TDP MMU unloading as making CR0.WP a guest owned
> bit turned out to be too much of an effort and the partial backport
> already being quite effective.
> 
> 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):
> 
>                           TDP    shadow
>     Linux v5.4.240       8.87s    56.8s
>     + patches            5.84s    55.4s
> 
> 
> This kernel version had no module parameter to control the TDP MMU
> setting, it's always enabled when EPT / NPT is. Therefore its meaning is
> likely what became "legacy" in newer kernels.
> 
> Please consider applying.

NAK, same problem as 5.10 and 5.15.  Sorry :-(



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