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SubjectRe: [PATCH v3 3/9] KVM: x86: Add Intel Processor Trace virtualization mode
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On 27/11/2017 21:23, Luwei Kang wrote:
> +/* Default is host guest mode. */
> +static int __read_mostly pt_mode = PT_MODE_HOST_GUEST;
> +module_param(pt_mode, int, S_IRUGO);
> +

This will cause a slowdown on new processors. Please make the default
PT_SYSTEM until that is addressed (with a combination of XSAVES, caching
the host rtit_ctl at the kernel level, or something like that).

Paolo

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