Messages in this thread | | | Date | Thu, 16 Jun 2022 12:21:20 +0200 | From | Paolo Bonzini <> | Subject | Re: [PATCH 00/19] Refresh queued CET virtualization series |
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On 6/16/22 12:12, Peter Zijlstra wrote: > Do I understand this right in that a host without X86_KERNEL_IBT cannot > run a guest with X86_KERNEL_IBT on? That seems unfortunate, since that > was exactly what I did while developing the X86_KERNEL_IBT patches. > > I'm thinking that if the hardware supports it, KVM should expose it, > irrespective of the host kernel using it.
For IBT in particular, I think all processor state is only loaded and stored at vmentry/vmexit (does not need XSAVES), so it should be feasible.
Paolo
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