Date: Tue, 25 Nov 2014 21:26:28 +0100
From: Borislav Petkov <bp@suse.de>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Richard Hendershot <rshendershot@mchsi.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        David Vrabel <david.vrabel@citrix.com>
Subject: Re: [PATCH 3.17 100/141] x86, microcode: Fix accessing dis_ucode_ldr
 on 32-bit
Message-ID: <20141125202628.GG4128@pd.tnic>
References: <20141119205150.700188369@linuxfoundation.org>
 <20141119205153.916605840@linuxfoundation.org>
 <5474C67A.7040200@oracle.com>
 <20141125182410.GB4128@pd.tnic>
 <5474CDCE.6040000@oracle.com>
 <20141125184351.GC4128@pd.tnic>
 <5474D0A1.2020600@oracle.com>
 <20141125190849.GF4128@pd.tnic>
 <5474D86E.6020608@oracle.com>
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On Tue, Nov 25, 2014 at 02:28:46PM -0500, Boris Ostrovsky wrote:
> You'd have to decide at runtime --- many baremetal systems are
> compiled with PARAVIRT.

Right, but the microcode loader is not used at all on PV, right?

If so, I'd like to add a arch_something_blabla_disabled_loader()
function which is run in the loader init path and returns false on
baremetal and a true when running as a xen guest. I'm not sure how the
detection should be done, though... CPUID with the hypervisor leaf?

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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