On 14.09.2023 08:03, Juergen Gross wrote:
> On 14.09.23 06:47, Xin Li wrote:
>> From: "H. Peter Anvin (Intel)" <h...@zytor.com>
>> Any FRED CPU will always have the following features as its baseline:
>>    1) LKGS, load attributes of the GS segment but the base address into
>>       the IA32_KERNEL_GS_BASE MSR instead of the GS segment’s descriptor
>>       cache.
>>    2) WRMSRNS, non-serializing WRMSR for faster MSR writes.
>> Signed-off-by: H. Peter Anvin (Intel) <h...@zytor.com>
>> Tested-by: Shan Kang <shan.k...@intel.com>
>> Signed-off-by: Xin Li <xin3...@intel.com>
> In order to avoid having to add paravirt support for FRED I think
> xen_init_capabilities() should gain:
> +    setup_clear_cpu_cap(X86_FEATURE_FRED);

I don't view it as very likely that Xen would expose FRED to PV guests
(Andrew?), at which point such a precaution may not be necessary.


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