On 08/01/16 19:05, Gerd Hoffmann wrote:
>   Hi,
> 
>> If it does, then the host kernel should be 4.4 or later. (If we want to
>> capture version numbers, then for each minor release, the latest patch
>> level should be required: 4.4.16, 4.5.7, 4.6.5, 4.7.0, because there
>> have been a number of KVM tweaks and stable backports for SMM support.)
> 
> Better check /dev/kvm for the KVM_CAP_X86_SMM capability, otherwise the
> rhel-7 kernel is out even though smm is backported.
> 
> Probably libvirt already has checks for other caps so it should be easy.

The problem is that KVM_CAP_X86_SMM does not guarantee that all the
tricky bugfixes are present in the host kernel.

Laszlo

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