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Date: Mon, 8 Feb 2016 17:52:27 +0100
From: Borislav Petkov <bp@alien8.de>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>, X86 ML <x86@kernel.org>,
        david.e.box@intel.com, Andrey Ryabinin <ryabinin.a.a@gmail.com>,
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        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Robert Moore <robert.moore@intel.com>, Ingo Molnar <mingo@redhat.com>,
        Andrey Ryabinin <aryabinin@virtuozzo.com>,
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        Fengguang Wu <fengguang.wu@intel.com>
Subject: Re: [Xen-devel] [PATCH v2 3/3] paravirt: rename paravirt_enabled to
 paravirt_legacy
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On Mon, Feb 08, 2016 at 11:41:16AM -0500, Boris Ostrovsky wrote:
> Keep in mind that Xen PV doesn't go through startup_32|64(). It starts at
> xen_start_kernel (save for a small stub before that), which sets pvops.  It
> "joins" regular/baremetal code in
> i386_start_kernel/x86_64_start_reservation().

Ah, so one more reason not to do the CPUID thing for the early loader.

So it's up to you how to replace that paravirt_enabled() thing - CPUID
or test static_cpu_has(X86_FEATURE_XENPV)...

-- 
Regards/Gruss,
    Boris.

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