linux-kernel - Re: [PATCH] KVM: VMX: require virtual NMI support

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Message-ID: <20171025081205.gx3cthpa5xzeumns@nora.maurer-it.com>
Date:   Wed, 25 Oct 2017 10:12:05 +0200
From:   Fabian Grünbichler <f.gruenbichler@...xmox.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Zdenek Kaspar <zkaspar82@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, rkrcmar@...hat.com
Subject: Re: [PATCH] KVM: VMX: require virtual NMI support

On Wed, Sep 13, 2017 at 10:34:26PM +0200, Paolo Bonzini wrote:
> On 13/09/2017 19:23, Zdenek Kaspar wrote:
> > On 03/27/2017 02:38 PM, Paolo Bonzini wrote:
> >> Virtual NMIs are only missing in Prescott and Yonah chips.  Both are obsolete
> >> for virtualization usage---Yonah is 32-bit only even---so drop vNMI emulation.
> >>
> >> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> >> ---
> >>  arch/x86/kvm/vmx.c | 143 ++++++++++++++---------------------------------------
> >>  1 file changed, 38 insertions(+), 105 deletions(-)
> > 
> > This breaks virtualization on old Intel Core2 machines.
> > Any chance to revert?
> 
> Already planned for 4.14 and future 4.13 stable kernels, but haven't
> gotten round to it.
> 
> Paolo
> 

any update on this? 4.14 is soon out the door, and 4.13 with the
breaking change just got released as part of Ubuntu 17.10 / Artful..