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Subject: Re: [PATCH] KVM: VMX: require virtual NMI support
To: Zdenek Kaspar <zkaspar82@gmail.com>, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org
Cc: rkrcmar@redhat.com
References: <1490618297-10581-2-git-send-email-pbonzini@redhat.com>
 <37c3939f-6c5e-1f88-5642-a5efb3ece1c4@gmail.com>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <16056526-1fc8-4ad8-5308-c16110d12e88@redhat.com>
Date: Wed, 13 Sep 2017 22:34:26 +0200
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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@redhat.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