Re: [Xen-devel] [PATCH 1/2] x86: report if PCID and INVPCID are supported

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.03.18 at 10:50, <wei.liu2@xxxxxxxxxx> wrote:
> --- a/xen/arch/x86/setup.c
> +++ b/xen/arch/x86/setup.c
> @@ -1701,6 +1701,13 @@ void __init noreturn __start_xen(unsigned long mbi_p)
>             cpu_has_nx ? XENLOG_INFO : XENLOG_WARNING "Warning: ",
>             cpu_has_nx ? "" : "not ");
>  
> +
> +    printk(XENLOG_INFO
> +           "PCID (Process-Context IDentifier) %ssupported\n",
> +           cpu_has_pcid ? "" : "not ");
> +
> +    printk(XENLOG_INFO "INVPCID %ssupported\n", cpu_has_invpcid ? "" : "not 
> ");

Do we really need this? We log a message for NX as an exception,
we don't do so for other features (and things would get pretty
unwieldy if we did).

Jan


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