* Does KVM support Intel FlexMigration feature?
@ 2013-12-03 5:50 Xuekun Hu
2013-12-03 12:55 ` Paolo Bonzini
0 siblings, 1 reply; 2+ messages in thread
From: Xuekun Hu @ 2013-12-03 5:50 UTC (permalink / raw)
To: kvm
Hi, All
Does KVM support Intel FlexMigration feature? If yes, is there a doc
to describe how to do use it (set cpu features mask)?
Many thanks.
Thx, Xuekun
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Does KVM support Intel FlexMigration feature?
2013-12-03 5:50 Does KVM support Intel FlexMigration feature? Xuekun Hu
@ 2013-12-03 12:55 ` Paolo Bonzini
0 siblings, 0 replies; 2+ messages in thread
From: Paolo Bonzini @ 2013-12-03 12:55 UTC (permalink / raw)
To: Xuekun Hu; +Cc: kvm
Il 03/12/2013 06:50, Xuekun Hu ha scritto:
> Hi, All
>
> Does KVM support Intel FlexMigration feature? If yes, is there a doc
> to describe how to do use it (set cpu features mask)?
> Many thanks.
KVM uses Intel's virtualization extensions (VT-x) for CPUID exits, and
not the masking/faulting MSRs. CPUID support is controlled by userspace
(i.e. outside KVM), using the KVM_GET_SUPPORTED_CPUID and KVM_SET_CPUID2
ioctl.
The ioctls are documented in Documentation/virtual/kvm/api.txt.
The KVM_SET_CPUID2 ioctl is not documented but it is the same as
KVM_SET_CPUID, except that is uses "struct kvm_cpuid2" instead of
"struct kvm_cpuid".
Paolo
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