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Re: [PATCH] KVM: VMX: require virtual NMI support

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  Re: [PATCH] KVM: VMX: require virtual NMI support Zdenek Kaspar <zkaspar82@gmail.com> - 2017-09-13 19:30 +0200
    Re: [PATCH] KVM: VMX: require virtual NMI support Paolo Bonzini <pbonzini@redhat.com> - 2017-09-13 22:40 +0200

#1731737 — Re: [PATCH] KVM: VMX: require virtual NMI support

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?

TIA, Z.

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#1731845

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

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