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

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Message-ID: <16056526-1fc8-4ad8-5308-c16110d12e88@redhat.com>
Date:   Wed, 13 Sep 2017 22:34:26 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Zdenek Kaspar <zkaspar82@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     rkrcmar@...hat.com
Subject: Re: [PATCH] KVM: VMX: require virtual NMI support

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