linux-kernel - Re: [PATCH v4] KVM: X86: Allow userspace to define the microcode version

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Message-ID: <20180227094303.GA30022@pd.tnic>
Date:   Tue, 27 Feb 2018 10:43:03 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org,
        Radim Krčmář <rkrcmar@...hat.com>,
        Liran Alon <liran.alon@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH v4] KVM: X86: Allow userspace to define the microcode
 version

On Tue, Feb 27, 2018 at 09:38:12AM +0100, Paolo Bonzini wrote:
> On 27/02/2018 03:35, Wanpeng Li wrote:
> > From: Wanpeng Li <wanpengli@...cent.com>
> > 
> > Linux (among the others) has checks to make sure that certain features 
> > aren't enabled on a certain family/model/stepping if the microcode version 
> > isn't greater than or equal to a known good version.
> > 
> > By exposing the real microcode version, we're preventing buggy guests that
> > don't check that they are running virtualized (i.e., they should trust the
> > hypervisor) from disabling features that are effectively not buggy.
> > 
> > Suggested-by: Filippo Sironi <sironi@...zon.de>
> > Cc: Paolo Bonzini <pbonzini@...hat.com>
> > Cc: Radim Krčmář <rkrcmar@...hat.com>
> > Cc: Liran Alon <liran.alon@...cle.com>
> > Cc: Nadav Amit <nadav.amit@...il.com>
> > Signed-off-by: Wanpeng Li <wanpengli@...cent.com>
> > ---
> > v3 -> v4:
> >  * add the shifts back
> 
> Please wait for a review instead of pushing new versions continuously.

... and pls CC me on your submissions.

Thx.

-- 
Regards/Gruss,
    Boris.

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