Re: [PATCH v3 09/14] x86/xen/msr: Remove calling native_{read,write}_msr{,_safe}() in pmu_msr_{read,write}()

[Jürgen Groß <jgross@xxxxxxxx>]

On 25.04.25 10:34, Xin Li (Intel) wrote:
> hpa found that pmu_msr_write() is actually a completely pointless
> function [1]: all it does is shuffle some arguments, then calls
> pmu_msr_chk_emulated() and if it returns true AND the emulated flag
> is clear then does *exactly the same thing* that the calling code
> would have done if pmu_msr_write() itself had returned true.  And
> pmu_msr_read() does the equivalent stupidity.
>
> Remove the calls to native_{read,write}_msr{,_safe}() within
> pmu_msr_{read,write}().  Instead reuse the existing calling code
> that decides whether to call native_{read,write}_msr{,_safe}() based
> on the return value from pmu_msr_{read,write}().  Consequently,
> eliminate the need to pass an error pointer to pmu_msr_{read,write}().
>
> While at it, refactor pmu_msr_write() to take the MSR value as a u64
> argument, replacing the current dual u32 arguments, because the dual
> u32 arguments were only used to call native_write_msr{,_safe}(), which
> has now been removed.
>
> [1]: 
> https://lore.kernel.org/lkml/0ec48b84-d158-47c6-b14c-3563fd14bcc4@xxxxxxxxx/
>
> Suggested-by: H. Peter Anvin (Intel) <hpa@xxxxxxxxx>
> Sign-off-by: Xin Li (Intel) <xin@xxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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